https://wiki.octave.org/wiki/api.php?action=feedcontributions&user=Francesco+Faccio&feedformat=atomOctave - User contributions [en]2020-04-07T11:07:28ZUser contributionsMediaWiki 1.34.0https://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=10659Summer of Code - Getting Started2018-02-09T17:03:56Z<p>Francesco Faccio: /* Summary table */</p>
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<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
You can also take a look at last years [[Summer of Code]] projects for inspiration.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' Linux is arguably the easiest system to work on. Instructions:<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [https://www.mercurial-scm.org/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [[Contribution guidelines | contribution]] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING.md guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [https://octave.sourceforge.io/ Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || No || Medium || [https://gsocspecfun.blogspot.de/ GSoC 2017]<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#FullSWOF overland flow simulator | FullSWOF overland flow simulator]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || No || Medium || [https://gsocinterval.blogspot.de/ GSoC 2017]<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#OCS | OCS package]] || Sebastian Schöps || Sebastian Schöps || Octave Forge, Numerical || Yes || Easy || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_code_sharing | Octave code sharing]] || [[User:Siko1056|Kai T. Ohlhus]] || ? || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#GUI Variable Editor and Property Inspector | GUI Property Inspector]] || ? || || GUI || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#SPQR Interface | Write API to SPQR Library]] || ? || || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#PolarAxes and Plotting Improvements | PolarAxes and Plotting Improvements ]] || ? || Rik || Graphics || Yes || Medium || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better function for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
:<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[http://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
The impact of this project is improving Octave and allowing Chebfun to be used without proprietary software.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, classdef programming, probably C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (fixing Octave classdef bugs likely harder and requires a deep dive into how Octave supports OOP).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs.<br />
<br />
First steps: clone this Chebfun [https://github.com/cbm755/chebfun/tree/octave_dev octave_dev branch]. On that, "f = chebfun(@(x) sin(x), [-2 6])" should work with Octave 4.3.0+ and maybe even with 4.2.1. Check that "f(pi)" and "g = f + 1" work. A good first task would be to study [https://github.com/cbm755/chebfun/commit/e20b0ad2dc89cfe8e50ba461b864eff7d5bbef17 this commit], a workaround for "f.funs{1}" using "temp = f.funs; temp{1}". "2*f" is failing, can you fix it, perhaps with this workaround? Or can you make "f.funs{1}" work by changing something in "@chebfun/subsref.m"?<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
* '''SWMM'''<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
* '''EPANET'''<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
* '''Difficulty'''<br />
: easy/medium<br />
<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== FullSWOF overland flow simulator ===<br />
Create scripting tools for (optional: native interfaces).<br />
<br />
Starting points<br />
* [http://www.univ-orleans.fr/mapmo/soft/FullSWOF/ The FullSWOF Project].<br />
* [https://arxiv.org/abs/1204.3210 FullSWOF: A software for overland flow simulation]<br />
* [https://bitbucket.org/binello7/fswof2d Initial work on Bitbucket]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
* '''Difficulty'''<br />
: easy/medium<br />
<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [[TISEAN package | partially re-implemented]] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [https://octave.sourceforge.io/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Implement missing algorithms (as m-files)-difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use [[Contribution_guidelines#Coding_style|Octave coding guidelines]] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB [http://www.ti3.tu-harburg.de/rump/intlab/], a proprietary Octave/Matlab package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== OCS ===<br />
<br />
[[Ocs package | OCS]] is a circuit simulator for Octave. The objective of this project is to update the code to use modern features of Octave (e.g. classdef), fix open bugs, increase compatibility with SPICE and improve compatibility with other Octave packages (odepkg, control etc).<br />
<br />
* [http://octave.sourceforge.net/ocs/overview.html Package help at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: Sebastian Schöps, Carlo de Falco<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
<br />
=== Octave code sharing ===<br />
<br />
Recently, on the [[OctConf_2017]] a [https://rawgit.com/siko1056/Octconf2017/master/octconf2017-publish-ohlhus-slides.pdf talk] about uploading [https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html published Octave code] to a MediaWiki (like this one) as an easy way to share code was given. With the talk, a [https://github.com/siko1056/OctConf2017 repository] containing example code for the MediaWiki upload is given. This might continue the idea of an unfinished [[Agora]] code sharing website, but one is not restricted to fully stay with the proposed approach. Another, but more ambitious idea is for example [http://central.scipy.org/ Scipy Central] - a website for Scipy code sharing. Their [https://github.com/scipy/SciPyCentral Code] is released under a BSD license.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, some familiarity with C++ ([https://curl.haxx.se libcurl]), web development (GET/POST/FORM data, cookies), and [https://www.mediawiki.org/wiki/MediaWiki MediaWiki].<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== SPQR Interface ===<br />
<br />
Octave implements QR factorization for sparse matrices, but it does so with an older library. This has caused fundamental issues, including segfaults as recorded here (https://savannah.gnu.org/bugs/?func=detailitem&item_id=51950). The goal of this project is to program an interface to the API for the SQPR library (http://faculty.cse.tamu.edu/davis/suitesparse.html). This is the same library that Matlab uses for this purpose.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write C++ code.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: <br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [[Image package#Missing functions | not yet been implemented]]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
== GUI ==<br />
<br />
=== GUI Variable Editor and Property Inspector ===<br />
<br />
Octave has a preliminary implementation of a Variable Editor: a spreadsheet-like tool for quickly editing and visualizing variables. The initial phase of the project will be learning how the implementation was done.<br />
<br />
With the knowledge gained, the second part of the project will be to implement a Property Inspector. This is a spreadsheet like interface to the many, many graphics properties that exist and are different on a per-object basis. The goal would be not only the concise-display of the existing properties, but a reasonable user interface to change them. As examples, boolean properties should be able to be toggled with a double-click; Radio properties should have a drop-down list of only the supported options; Other properties that can be modified should have the constraints built-in (for example, Linewidth must be a scalar, while Position must be a 1x4 vector). It would also be important to have easy access to the documentation of a property.<br />
<br />
For reference, Matlab has a similar Property Inspector (https://www.mathworks.com/help/matlab/ref/inspect.html).<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write C++ code. Experience with Qt toolkit and GUI programming is optional, but desirable.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
:<br />
<br />
== Graphics ==<br />
<br />
=== PolarAxes and Plotting Improvements ===<br />
<br />
Octave currently provides supports for polar axes by using a Cartesian 2-D axes and adding a significant number of properties and callback listerners to get things to work. What is needed is a first class implementation of a "polaraxes" object in C++. This will require creating a new fundamental graphics object type, and programming in C++/OpenGL to render the object. When "polaraxes" exist as an object type then m-files will be written to access them including polaraxes.m, polarplot.m, rticks.m, rticklabels.m, thetaticks, thetaticklabels.m, rlim.m, thetalim.m<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write C++ code. Ability to read and write Octave code. Experience with OpenGL programming is optional.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: Rik <br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=10658Summer of Code - Getting Started2018-02-09T17:02:54Z<p>Francesco Faccio: /* Adding functionality to Forge packages */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
You can also take a look at last years [[Summer of Code]] projects for inspiration.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' Linux is arguably the easiest system to work on. Instructions:<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [https://www.mercurial-scm.org/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [[Contribution guidelines | contribution]] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING.md guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [https://octave.sourceforge.io/ Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || No || Medium || [https://gsocspecfun.blogspot.de/ GSoC 2017]<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Neural Networks package: Convolutional Neural Networks | Neural Networks package: Convolutional Neural Networks]] || [[User:Francesco Faccio|Francesco Faccio]] || Ankit || Octave Forge || No || Hard || [https://gsocnnet.blogspot.de/ GSoC 2017]<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#FullSWOF overland flow simulator | FullSWOF overland flow simulator]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || No || Medium || [https://gsocinterval.blogspot.de/ GSoC 2017]<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#OCS | OCS package]] || Sebastian Schöps || Sebastian Schöps || Octave Forge, Numerical || Yes || Easy || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_code_sharing | Octave code sharing]] || [[User:Siko1056|Kai T. Ohlhus]] || ? || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#GUI Variable Editor and Property Inspector | GUI Property Inspector]] || ? || || GUI || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#SPQR Interface | Write API to SPQR Library]] || ? || || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#PolarAxes and Plotting Improvements | PolarAxes and Plotting Improvements ]] || ? || Rik || Graphics || Yes || Medium || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better function for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
:<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[http://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
The impact of this project is improving Octave and allowing Chebfun to be used without proprietary software.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, classdef programming, probably C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (fixing Octave classdef bugs likely harder and requires a deep dive into how Octave supports OOP).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs.<br />
<br />
First steps: clone this Chebfun [https://github.com/cbm755/chebfun/tree/octave_dev octave_dev branch]. On that, "f = chebfun(@(x) sin(x), [-2 6])" should work with Octave 4.3.0+ and maybe even with 4.2.1. Check that "f(pi)" and "g = f + 1" work. A good first task would be to study [https://github.com/cbm755/chebfun/commit/e20b0ad2dc89cfe8e50ba461b864eff7d5bbef17 this commit], a workaround for "f.funs{1}" using "temp = f.funs; temp{1}". "2*f" is failing, can you fix it, perhaps with this workaround? Or can you make "f.funs{1}" work by changing something in "@chebfun/subsref.m"?<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
* '''SWMM'''<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
* '''EPANET'''<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
* '''Difficulty'''<br />
: easy/medium<br />
<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== FullSWOF overland flow simulator ===<br />
Create scripting tools for (optional: native interfaces).<br />
<br />
Starting points<br />
* [http://www.univ-orleans.fr/mapmo/soft/FullSWOF/ The FullSWOF Project].<br />
* [https://arxiv.org/abs/1204.3210 FullSWOF: A software for overland flow simulation]<br />
* [https://bitbucket.org/binello7/fswof2d Initial work on Bitbucket]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
* '''Difficulty'''<br />
: easy/medium<br />
<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [[TISEAN package | partially re-implemented]] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [https://octave.sourceforge.io/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Implement missing algorithms (as m-files)-difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use [[Contribution_guidelines#Coding_style|Octave coding guidelines]] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB [http://www.ti3.tu-harburg.de/rump/intlab/], a proprietary Octave/Matlab package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== OCS ===<br />
<br />
[[Ocs package | OCS]] is a circuit simulator for Octave. The objective of this project is to update the code to use modern features of Octave (e.g. classdef), fix open bugs, increase compatibility with SPICE and improve compatibility with other Octave packages (odepkg, control etc).<br />
<br />
* [http://octave.sourceforge.net/ocs/overview.html Package help at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: Sebastian Schöps, Carlo de Falco<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
<br />
=== Octave code sharing ===<br />
<br />
Recently, on the [[OctConf_2017]] a [https://rawgit.com/siko1056/Octconf2017/master/octconf2017-publish-ohlhus-slides.pdf talk] about uploading [https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html published Octave code] to a MediaWiki (like this one) as an easy way to share code was given. With the talk, a [https://github.com/siko1056/OctConf2017 repository] containing example code for the MediaWiki upload is given. This might continue the idea of an unfinished [[Agora]] code sharing website, but one is not restricted to fully stay with the proposed approach. Another, but more ambitious idea is for example [http://central.scipy.org/ Scipy Central] - a website for Scipy code sharing. Their [https://github.com/scipy/SciPyCentral Code] is released under a BSD license.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, some familiarity with C++ ([https://curl.haxx.se libcurl]), web development (GET/POST/FORM data, cookies), and [https://www.mediawiki.org/wiki/MediaWiki MediaWiki].<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== SPQR Interface ===<br />
<br />
Octave implements QR factorization for sparse matrices, but it does so with an older library. This has caused fundamental issues, including segfaults as recorded here (https://savannah.gnu.org/bugs/?func=detailitem&item_id=51950). The goal of this project is to program an interface to the API for the SQPR library (http://faculty.cse.tamu.edu/davis/suitesparse.html). This is the same library that Matlab uses for this purpose.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write C++ code.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: <br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [[Image package#Missing functions | not yet been implemented]]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
== GUI ==<br />
<br />
=== GUI Variable Editor and Property Inspector ===<br />
<br />
Octave has a preliminary implementation of a Variable Editor: a spreadsheet-like tool for quickly editing and visualizing variables. The initial phase of the project will be learning how the implementation was done.<br />
<br />
With the knowledge gained, the second part of the project will be to implement a Property Inspector. This is a spreadsheet like interface to the many, many graphics properties that exist and are different on a per-object basis. The goal would be not only the concise-display of the existing properties, but a reasonable user interface to change them. As examples, boolean properties should be able to be toggled with a double-click; Radio properties should have a drop-down list of only the supported options; Other properties that can be modified should have the constraints built-in (for example, Linewidth must be a scalar, while Position must be a 1x4 vector). It would also be important to have easy access to the documentation of a property.<br />
<br />
For reference, Matlab has a similar Property Inspector (https://www.mathworks.com/help/matlab/ref/inspect.html).<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write C++ code. Experience with Qt toolkit and GUI programming is optional, but desirable.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
:<br />
<br />
== Graphics ==<br />
<br />
=== PolarAxes and Plotting Improvements ===<br />
<br />
Octave currently provides supports for polar axes by using a Cartesian 2-D axes and adding a significant number of properties and callback listerners to get things to work. What is needed is a first class implementation of a "polaraxes" object in C++. This will require creating a new fundamental graphics object type, and programming in C++/OpenGL to render the object. When "polaraxes" exist as an object type then m-files will be written to access them including polaraxes.m, polarplot.m, rticks.m, rticklabels.m, thetaticks, thetaticklabels.m, rlim.m, thetalim.m<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write C++ code. Ability to read and write Octave code. Experience with OpenGL programming is optional.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: Rik <br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=10130Summer of Code - Getting Started2017-03-23T20:45:28Z<p>Francesco Faccio: /* Summary table */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Neural Networks package: Convolutional Neural Networks | Neural Networks package: Convolutional Neural Networks]] || [[User:Francesco Faccio|Francesco Faccio]] || Ankit || Octave Forge || Yes || Hard|| Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_code_sharing | Octave code sharing]] || [[User:Siko1056|Kai T. Ohlhus]] || ? || Infrastructure || Yes || Medium || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
=== Neural Networks package: Convolutional Neural Networks ===<br />
Convolutional Neural Networks (CNNs) have recently become the state-of-the-art for image recognition and are widely used for solving classification and regression problems and for [https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/deepdream/deepdream.ipynb image generation]. The goal of the project is to implement a [https://it.mathworks.com/help/nnet/convolutional-neural-networks.html Matlab compatible] CNN toolbox using Google's library [https://www.tensorflow.org/ TensorFlow], which has a Python and C++ interface. As execution environment for the training function, the user will be able to choose between single/multiple CPUs and GPUs.<br />
* '''Required skills'''<br />
: C, C++, Python, m-file scripting, familiarity with Machine Learning algorithms, basic knowledge of Makefiles, experience with parallel computing and distributed systems.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Mentors'''<br />
: [[User:Francesco Faccio|Francesco Faccio]], Ankit<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
<br />
=== Octave code sharing ===<br />
<br />
Recently, on the [[OctConf_2017]] a [https://rawgit.com/siko1056/Octconf2017/master/octconf2017-publish-ohlhus-slides.pdf talk] about uploading [https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html published Octave code] to a MediaWiki (like this one) as an easy way to share code was given. With the talk, a [https://github.com/siko1056/OctConf2017 repository] containing example code for the MediaWiki upload is given. This might continue the idea of an unfinished [[Agora]] code sharing website, but one is not restricted to fully stay with the proposed approach. Another, but more ambitious idea is for example [http://central.scipy.org/ Scipy Central] - a website for Scipy code sharing. Their [https://github.com/scipy/SciPyCentral Code] is released under a BSD license.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, some familiarity with C++ ([https://curl.haxx.se libcurl]), web development (GET/POST/FORM data, cookies), and [https://www.mediawiki.org/wiki/MediaWiki MediaWiki].<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=10129Summer of Code - Getting Started2017-03-23T20:43:39Z<p>Francesco Faccio: /* Neural Networks package: Convolutional Neural Networks */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Neural Networks package: Convolutional Neural Networks | Neural Networks package: Convolutional Neural Networks]] || [[User:Francesco Faccio|Francesco Faccio]] || ? || Octave Forge || Yes || Hard|| Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_code_sharing | Octave code sharing]] || [[User:Siko1056|Kai T. Ohlhus]] || ? || Infrastructure || Yes || Medium || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
=== Neural Networks package: Convolutional Neural Networks ===<br />
Convolutional Neural Networks (CNNs) have recently become the state-of-the-art for image recognition and are widely used for solving classification and regression problems and for [https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/deepdream/deepdream.ipynb image generation]. The goal of the project is to implement a [https://it.mathworks.com/help/nnet/convolutional-neural-networks.html Matlab compatible] CNN toolbox using Google's library [https://www.tensorflow.org/ TensorFlow], which has a Python and C++ interface. As execution environment for the training function, the user will be able to choose between single/multiple CPUs and GPUs.<br />
* '''Required skills'''<br />
: C, C++, Python, m-file scripting, familiarity with Machine Learning algorithms, basic knowledge of Makefiles, experience with parallel computing and distributed systems.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Mentors'''<br />
: [[User:Francesco Faccio|Francesco Faccio]], Ankit<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
<br />
=== Octave code sharing ===<br />
<br />
Recently, on the [[OctConf_2017]] a [https://rawgit.com/siko1056/Octconf2017/master/octconf2017-publish-ohlhus-slides.pdf talk] about uploading [https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html published Octave code] to a MediaWiki (like this one) as an easy way to share code was given. With the talk, a [https://github.com/siko1056/OctConf2017 repository] containing example code for the MediaWiki upload is given. This might continue the idea of an unfinished [[Agora]] code sharing website, but one is not restricted to fully stay with the proposed approach. Another, but more ambitious idea is for example [http://central.scipy.org/ Scipy Central] - a website for Scipy code sharing. Their [https://github.com/scipy/SciPyCentral Code] is released under a BSD license.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, some familiarity with C++ ([https://curl.haxx.se libcurl]), web development (GET/POST/FORM data, cookies), and [https://www.mediawiki.org/wiki/MediaWiki MediaWiki].<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor'''<br />
: [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=9954Summer of Code - Getting Started2017-03-14T13:20:22Z<p>Francesco Faccio: /* Neural Networks package: Convolutional Neural Networks */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Neural Networks package: Convolutional Neural Networks | Neural Networks package: Convolutional Neural Networks]] || [[User:Francesco Faccio|Francesco Faccio]] || ? || Octave Forge || Yes || Hard|| Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
=== Neural Networks package: Convolutional Neural Networks ===<br />
Convolutional Neural Networks (CNNs) have recently become the state-of-the-art for image recognition and are widely used for solving classification and regression problems and for [https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/deepdream/deepdream.ipynb image generation]. The goal of the project is to implement a [https://it.mathworks.com/help/nnet/convolutional-neural-networks.html Matlab compatible] CNN toolbox using Google's library [https://www.tensorflow.org/ TensorFlow], which has a Python and C++ interface. As execution environment for the training function, the user will be able to choose between single/multiple CPUs and GPUs.<br />
* '''Required skills'''<br />
: C, C++, Python, m-file scripting, familiarity with Machine Learning algorithms, basic knowledge of Makefiles, experience with parallel computing and distributed systems.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Mentors'''<br />
: [[User:Francesco Faccio|Francesco Faccio]]<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=9952Summer of Code - Getting Started2017-03-13T20:56:55Z<p>Francesco Faccio: /* Summary table */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Neural Networks package: Convolutional Neural Networks | Neural Networks package: Convolutional Neural Networks]] || [[User:Francesco Faccio|Francesco Faccio]] || ? || Octave Forge || Yes || Hard|| Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
=== Neural Networks package: Convolutional Neural Networks ===<br />
Convolutional Neural Networks (CNNs) have recently become the state-of-the-art for image recognition and are widely used for solving classification and regression problems and for [https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/deepdream/deepdream.ipynb generating images]. The goal of the project is to implement a [https://it.mathworks.com/help/nnet/convolutional-neural-networks.html Matlab compatible] CNN toolbox using Google's library [https://www.tensorflow.org/ TensorFlow], which has a Python and C++ interface.<br />
<br />
* '''Required skills'''<br />
: C, C++, Python, m-file scripting, familiarity with Machine Learning algorithms, basic knowledge of Makefiles.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Mentors'''<br />
: [[User:Francesco Faccio|Francesco Faccio]]<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=9951Summer of Code - Getting Started2017-03-13T20:56:29Z<p>Francesco Faccio: /* Neural Networks package: Convolutional Neural Networks */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
=== Neural Networks package: Convolutional Neural Networks ===<br />
Convolutional Neural Networks (CNNs) have recently become the state-of-the-art for image recognition and are widely used for solving classification and regression problems and for [https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/deepdream/deepdream.ipynb generating images]. The goal of the project is to implement a [https://it.mathworks.com/help/nnet/convolutional-neural-networks.html Matlab compatible] CNN toolbox using Google's library [https://www.tensorflow.org/ TensorFlow], which has a Python and C++ interface.<br />
<br />
* '''Required skills'''<br />
: C, C++, Python, m-file scripting, familiarity with Machine Learning algorithms, basic knowledge of Makefiles.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Mentors'''<br />
: [[User:Francesco Faccio|Francesco Faccio]]<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=9950Summer of Code - Getting Started2017-03-13T20:48:59Z<p>Francesco Faccio: /* Adding functionality to Forge packages */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
<br />
=== Neural Networks package: Convolutional Neural Networks ===<br />
Convolutional Neural Networks (CNNs) have recently become the state-of-the-art for image recognition and are widely used for solving classification and regression problems and for [https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/deepdream/deepdream.ipynb generating images]. The goal of the project is to implement a [https://it.mathworks.com/help/nnet/convolutional-neural-networks.html Matlab compatible] CNN toolbox using Google's library [https://www.tensorflow.org/ TensorFlow], which has a Python and C++ interface.<br />
<br />
* '''Required skills'''<br />
: C, C++, Python, m-file scripting, familiarity with Machine Learning algorithms, basic knowledge of Makefiles.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Mentor'''<br />
: [[User:Francesco Faccio|Francesco Faccio]]<br />
<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=9944Summer of Code - Getting Started2017-03-10T10:54:43Z<p>Francesco Faccio: /* Summary table */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15{i,s} : Matlab Compatible DAE solvers]] || Carlo de Falco || Francesco Faccio, Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=Summer_of_Code_-_Getting_Started&diff=9943Summer of Code - Getting Started2017-03-10T10:52:50Z<p>Francesco Faccio: /* ode15{i,s} : Matlab Compatible DAE solvers */</p>
<hr />
<div>The following is distilled from the [[Projects]] page for the benefit of potential [https://summerofcode.withgoogle.com Google] and [http://sophia.estec.esa.int/socis ESA] Summer of Code (SoC) students. Although students are welcome to attempt any of the projects in that page or any of their own choosing, here we offer some suggestions on what good student projects might be.<br />
<br />
= Steps Toward a Successful Application =<br />
<br />
== Help Us Get To Know You == <br />
*: If you aren't communicating with us before the application is due, your application will not be accepted.<br />
*:* '''Join the [https://lists.gnu.org/mailman/listinfo/octave-maintainers maintainers mailing list]''' or read the archives and see what topics we discuss and how the developers interact with each other.<br />
*:* '''Hang out in our [https://webchat.freenode.net/?channels=#octave IRC channel]'''. Ask questions, answer questions from users, show us that you are motivated, and well-prepared. There will be more applicants than we can effectively mentor, so do ask for feedback on your public application to increase the strength of your proposal!<br />
* '''Do not wait for us to tell you what to do'''<br />
*: You should be doing something that interests you, and should not need us to tell you what to do. Similarly, you shouldn't ask us what to do either.<br />
*:* When you email the list and mentors, do not write it to say on what project you're interested. Be specific about your questions and clear on the email subject. For example, do not write an email with the subject "GSoC student interested in the ND images projects". Such email is likely be ignored. Instead, show you are already working on the topic, and email "Problem implementing morphological operators with bitpacked ND images".<br />
*:* It is good to ask advice on how to solve something you can't but you must show some work done. Remember, we are mentors and not your boss. Read [http://www.catb.org/esr/faqs/smart-questions.html How to ask questions the smart way]:<br />
*:*: <blockquote cite="http://www.catb.org/esr/faqs/smart-questions.html">''Prepare your question. Think it through. Hasty-sounding questions get hasty answers, or none at all. The more you do to demonstrate that having put thought and effort into solving your problem before seeking help, the more likely you are to actually get help.''</blockquote><br />
*:* It can be difficult at the beginning to think on something to do. This is nature of free and open source software development. You will need to break the mental barrier that prevents you from thinking on what can be done. Once you do that, you will have no lack of ideas for what to do next.<br />
*:* Use Octave. Eventually you will come accross somethings that does not work the way you like. Fix that. Or you will come accross a missing function. Implement it. It may be a difficult problem (they usually are) but while solving that problem you may find other missing functions (). Implemenent and contribute those to Octave.<br />
*:* Take a look at the [[Short projects]] for something that may be simple to start with.<br />
== Find Something That Interests You == <br />
*: It's '''critical''' that you '''find a project that excites you'''. You'll be spending most of the summer working on it (we expect you to treat the SoC as a full-time job).<br />
*: Don't just tell us how interested you are, show us that you're willing and able to '''contribute''' to Octave. You can do that by [https://savannah.gnu.org/bugs/?group=octave fixing a few bugs] or [http://savannah.gnu.org/patch/?group=octave submitting patches] well before the deadline, in addition to regularly interacting with Octave maintainers and users on the mailing list and IRC. Our experience shows us that successful SoC students demonstrate their interest early and often.<br />
== Prepare Your Proposal With Us ==<br />
*: By working with us to prepare your proposal, you'll be getting to know us and showing us how you approach problems. The best place for this is your Wiki user page and the [https://webchat.freenode.net/?channels=#octave IRC channel].<br />
== Complete Your Application ==<br />
*: Fill out our '''''public''''' application template.<br />
*:* This is best done by '''[[Special:CreateAccount|creating an account at this wiki]]''', and copying the '''[[Template:Student_application_template_public|template]]''' from its page.<br />
*:* You really only need to copy and answer the '''''public''''' part there, there is no need to showcase everything else to everybody reading your user page!<br />
*: Fill out our '''''private''''' application template.<br />
*:* This is best done by copying the '''[[Template:Student_application_template_private|template]]''' from its page and '''adding the required information to your application at Google (melange)''' or at '''ESA'''.<br><br />
*:* Only the organization admin and the possible mentors will see this data. You can still edit it after submitting until the deadline!<br />
<br />
== Things You'll be Expected to Know or Quickly Learn On Your Own ==<br />
<br />
Octave is mostly written in C++ and its own scripting language that is mostly compatible with Matlab. There are bits and pieces of Fortran, Perl, C, awk, and Unix shell scripts here and there. In addition to being familiar with C++ and Octave's scripting language, successful applicants will be familiar with or able to quickly learn about Octave's infrastructure. You can't spend the whole summer learning how to build Octave or prepare a changeset and still successfully complete your project.<br />
<br />
* '''The Build System'''<br />
*: [http://en.wikipedia.org/wiki/GNU_build_system The GNU build system] is used to build Octave.<br />
*: While you generally don't need to understand too much unless you actually want to change how Octave is built, you should be able to understand enough to get a general idea of how to build Octave.<br />
*: If you've ever done a {{Codeline|configure && make && make install}} series of commands, you have already used the GNU build system.<br />
*: '''You must demonstrate that you are able to build the development version of Octave from sources before the application deadline.''' You will be able to find instructions how to it on this wiki, and the manual. Linux is arguably the easiest system to work on.<br />
*:* [[Building_for_Linux_systems]]<br />
*:* [[Building]]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Building-the-Development-Sources.html Octave Manual on Building the Development Sources]<br />
*:* [https://www.gnu.org/software/octave/doc/interpreter/Installation.html Octave Manual on Installing Octave]<br />
* '''The Version Control System'''<br />
*: We use [http://mercurial.selenic.com/ Mercurial] (abbreviated hg).<br />
*: Mercurial is the [http://en.wikipedia.org/wiki/Distributed_Version_Control_System distributed version control system] (DVCS) we use for managing our source code. You should have some basic understanding of how a DVCS works, but hg is pretty easy to pick up, especially if you already know a VCS like git or svn.<br />
* '''The Procedure for Contributing Changesets'''<br />
*: You will be expected to follow the same procedures as other contributors and core developers.<br />
*: You will be helping current and future Octave developers by using our standard style for changes, commit messages, and so on. You should also read the same [https://www.gnu.org/software/octave/doc/interpreter/Contributing-Guidelines.html contribution] [http://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING guidelines] we have for everyone.<br />
*: [[Hg_instructions_for_mentors#Mercurial_Tips_for_SoC_students | This page]] describes the procedures students are expected to use to publicly display their progress in a public mercurial repo during their work.<br />
* '''The Maintainers Mailing List'''<br />
*: We primarily use [https://lists.gnu.org/mailman/listinfo/octave-maintainers mailing lists] for communication among developers.<br />
*: The mailing list is used most often for discussions about non-trivial changes to Octave, or for setting the direction of development.<br />
*: You should follow basic mailing list etiquette. For us, this mostly means "do not [https://en.wikipedia.org/wiki/Posting_style#Top-posting top post]".<br />
* '''The IRC Channel'''<br />
*: We also have [http://webchat.freenode.net?channels=octave the #octave IRC channel in Freenode].<br />
*: You should be familiar with the IRC channel. It's very helpful for new contributors (you) to get immediate feedback on ideas and code.<br />
*: Unless your primary mentor has a strong preference for some other method of communication, the IRC channel will likely be your primary means of communicating with your mentor and Octave developers.<br />
* '''The Octave Forge Project'''<br />
*: [http://octave.sf.net Octave-Forge] is a collection of contributed packages that enhance the capabilities of core Octave. They are somewhat analogous to Matlab's toolboxes.<br />
* '''Related Skills'''<br />
*: In addition, you probably should know '''some''' mathematics, engineering, experimental science, or something of the sort.<br />
*: If so, you probably have already been exposed to the kinds of problems that Octave is used for.<br />
<br />
== Criteria by which applications are judged ==<br />
<br />
These might vary somewhat depending on the mentors and coordinators for a particular Summer of Code, but typically the main factors considered would be:<br />
<br />
* '''Applicant has demonstrated an ability to make substantial modifications to Octave'''<br />
*: The most important thing is that you've contributed some interesting code samples to judge you by. It's OK during the application period to ask for help on how to format these code samples, which normally are Mercurial patches.<br />
<br />
* '''Applicant shows understanding of topic'''<br />
*: Your application should make it clear that you're reasonably well versed in the subject area and won't need all summer just to read up on it.<br />
<br />
* '''Applicant shows understanding of and interest in Octave development'''<br />
*: The best evidence for this is previous contributions and interactions.<br />
<br />
* '''Well thought out, adequately detailed, realistic project plan'''<br />
*: "I'm good at this, so trust me" isn't enough. You should describe which algorithms you'll use and how you'll integrate with existing Octave code. You should also prepare a full timeline and goals for the midterm and final evaluations.<br />
<br />
= Suggested projects =<br />
<br />
The following projects are broadly grouped by category and probable skills required to tackle each. Remember to check [[Projects]] for more ideas if none of these suit you, and your own ideas are always welcome.<br />
<br />
{{Note|these are suggested projects but you are welcome to propose your own projects provided you find an Octave mentor}}<br />
<br />
== Summary table ==<br />
<br />
{| class="wikitable sortable" style="text-align: center; width:99%"<br />
|-<br />
!Title<br />
!Mentor<br />
!co-Mentors<br />
!Class<br />
!New?<br />
!Difficulty<br />
!Last active<br />
|-<br />
! <br />!! !! !! !! !! !!<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Make_specfuns_special_again | Make specfuns special again]] || Marco Caliari || Colin Macdonald || Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver | ode15s : Matlab Compatible DAE solver]] || Carlo de Falco || Marco Caliari, Jacopo Corno, Sebastian Schöps || Numerical || No || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_logm.2C_sqrtm.2C_funm | Improve logm, sqrtm, funm]] || Jordi Gutiérrez Hermoso || Marco Caliari, Mudit Sharma || Numerical || [https://github.com/RickOne16/matrix No] || Hard || Independent devs 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Improve_iterative_methods_for_sparse_linear_systems | Improve iterative methods for sparse linear systems]] || Marco Caliari || Carlo de Falco || Numerical || No || Hard || SOCIS 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#EPA_hydrology_software_suite | EPA hydrology software suite]] || [[User:KaKiLa| KaKiLa]] || ? || Octave Forge || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#TISEAN_package | TISEAN: Nonlinear Time Series Analysis]] || [[User:KaKiLa|KaKiLa]] || ? || Octave Forge || [[TISEAN_package | No]] || Medium || GSoC 2015<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Mapping_or_Geometry_package:_Implement_boolean_operations_on_polygons | Geometry: Boolean operations on Polygons]] || John Swensen || [[User:KaKiLa|KaKiLa]], Philip Neuhuis || Octave Forge || [https://amrkeleg.wordpress.com/ No] || Easy || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Octave_Package_management | Octave Package management]] || Sebastian Schöps || [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Symbolic_package | Symbolic package]] || Colin B. Macdonald || Mike Miller, Abhinav Tripathi || Octave Forge || [https://github.com/cbm755/octsympy Octsympy] || Medium || GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Interval_package | Interval package]] || [[User:oheim|Oliver Heimlich]] || [[User:Siko1056|Kai T. Ohlhus]] || Octave Forge, Numerical || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Using_Python_within_Octave | Pytave project]] || Mike Miller || Colin B. Macdonald, Abhinav Tripathi || Infrastructure || No || Medium || some in GSoC 2016<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Jupyter_Integration | Jupyter integration]] || Mike Miller || Colin B. Macdonald || Infrastructure || Yes || Medium || Never<br />
|-<br />
| [[Summer_of_Code_Project_Ideas#Chebfun_in_Octave | Chebfun in Octave]] || Colin B. Macdonald || [[User:KaKiLa|KaKiLa]], needs core-Octave mentor/comentor || Infrastructure, Numerical || Yes || Hard || Never<br />
|}<br />
<br />
== Numerical ==<br />
<br />
These projects involve implementing certain mathematical functions, primarily in core Octave.<br />
<br />
=== Make specfuns special again ===<br />
<br />
Traditionally, problem solving environments like Octave provide simple interfaces to numerical linear algebra, special function evaluation, root finding, and other tools. Special functions (such as Bessel functions, exponential integrals, LambertW, etc) are expected by users to "just work". But many of Octave's special functions could be improved to improve their numerical accuracy. Generally a user might expect these to be accurate to full 15 digits. Software testing is important to Octave; this project would improve the tests of many special functions, in particular by comparing the output with slow-but-accurate symbolic computations.<br />
<br />
State: some bugs include [https://savannah.gnu.org/bugs/?48307 #48307] (sinc), [https://savannah.gnu.org/bugs/?47738 #47738] (expint), [https://savannah.gnu.org/bugs/?47800 #47800] (gammainc), [https://savannah.gnu.org/bugs/?48036 #48036] (gammaincinv) [https://savannah.gnu.org/bugs/index.php?48316 #48316] (besselj) ''TODO: add others?'' The unmaintained specfun pkg had some poor implementations (e.g., divergence for large x, see [https://github.com/cbm755/octsympy/issues/416].). See also the Symbolic functions in `@double`: these probably should have native double implementations.<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium (mathematics needed, but on the other hand, perhaps little or no C++).<br />
* '''Potential mentors'''<br />
: Marco Caliari, Colin Macdonald, others?<br />
<br />
How to get started: pick a special function, see if it has tests: contribute a patch that adds more tests, e.g., comparing its values to symbolic computations or other highly accurate solutions<br />
<br />
=== ode15{i,s} : Matlab Compatible DAE solvers ===<br />
<br />
An initial implementation of a Matlab compatible ode15{i,s} solver,<br />
based on [http://computation.llnl.gov/projects/sundials SUNDIALS], <br />
was done by Francesco Faccio during<br />
GSOC 2016.<br />
The blog describing the work is [http://gsoc2016ode15s.blogspot.it/ here].<br />
The resulting code has been pushed into the main Octave repository in the development branch and<br />
consists mainly of the following three files<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/libinterp/dldfcn/__ode15__.cc __ode15__.cc],<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15i.m ode15i.m] and<br />
[http://hg.savannah.gnu.org/hgweb/octave/file/4890b1c4a6bd/scripts/ode/ode15s.m ode15s.m].<br />
The list of outsanding tracker tickets concerning this implementation can be found <br />
[https://savannah.gnu.org/search/?Search=Search&words=ode15&type_of_search=bugs&only_group_id=1925&exact=1&max_rows=25#options here]<br />
<br />
Possible useful improvements that could be done in a new project include:<br />
<br />
* Implement a better funtion for selecting consistent initial conditions compatible with Matlab's decic.m. The algorithm to use is described [http://faculty.smu.edu/shampine/cic.pdf here]<br />
<br />
* make ode15{i,s} with datatypes other than double<br />
<br />
* improve interpolation at intermediate time steps.<br />
<br />
* general code profiling and optimization <br />
<br />
Other tasks, not strictly connected to ode15{i,s} but closely related that could be added <br />
to a possible project plan would be improving documentation and tests in odepkg and removing <br />
overlaps with the documentation in core Octave.<br />
<br />
<br />
* '''Required skills'''<br />
: C++; C; familiarity with numerical methods for DAEs; Basic knowledge of makefiles and/or autotools.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentors'''<br />
: Francesco Faccio, Carlo de Falco, Marco Caliari, Jacopo Corno, Sebastian Schöps<br />
<br />
=== Improve logm, sqrtm, funm ===<br />
<br />
The goal here is to implement some missing Matlab functions related to matrix functions like the [http://en.wikipedia.org/wiki/Matrix_exponential matrix exponential]. There is [http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html a general discussion] of the problem. A good starting point for available algorithms and open-source implementations is Higham and Deadman's [http://eprints.ma.man.ac.uk/2102/01/covered/MIMS_ep2014_8.pdf "A Catalogue of Software for Matrix Functions"].<br />
<br />
* '''Required skills'''<br />
: Read and Write both C++ and Octave code, find and read research papers, research experience in numerical analysis, familiarity with analysis of algorithms.<br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentors'''<br />
: Jordi Gutiérrez Hermoso<br />
<br />
=== Improve iterative methods for sparse linear systems ===<br />
<br />
GNU Octave currently has the following Krylov subspace methods for sparse linear systems: pcg (spd matrices) and pcr (Hermitian matrices), bicg,<br />
bicgstab, cgs, gmres, and qmr (general matrices). The description of some of them (pcr, qmr) and their error messages are not aligned. Moreover, they have similar blocks of code (input check for instance) which can be written once and for all in common functions. The first step in this project could be a revision and a synchronization of the codes, starting from the project [http://planet.octave.org/#tag:blogger.com,1999:blog-1297699247151766814.post-8054019978706480250 SOCIS2016], whose latest patch, still to be included, is [https://savannah.gnu.org/patch/?9108 here].<br />
<br />
In Matlab, some additional methods are available: minres and symmlq (symmetric matrices), bicgstabl (general matrices), lsqr (least<br />
squares). The second step in this project could be the implementation of some of these missing functions.<br />
<br />
The reference book is available [www-users.cs.umn.edu/~saad/IterMethBook_2ndEd.pdf here]<br />
<br />
* '''Required skills'''<br />
: numerical linear algebra, m-file programming.<br />
* '''Difficulty'''<br />
: Maybe hard the mathematical part, medium the programming part.<br />
* '''Mentor'''<br />
: Marco Caliari<br />
<br />
=== Chebfun in Octave ===<br />
<br />
[https://chebfun.org Chebfun] is a mathematics and software project for "numerical computing with functions". Basically it approximates functions to machine precision accuracy (10<sup>-15</sup>) using piecewise Chebyshev polynomial interpolants. Operations on those functions (arithmetic, derivatives, root-finding, etc) are then overloaded and return new interpolating polynomials, which are themselves proxies for the actual solution.<br />
<br />
Chebfun makes extensive use of classdef classes, and is one of the largest Free Software projects to do so. Unfortunately it currently only works in Matlab. This project seeks to (1) improve Octave's classdef support and (2) tweak Chebfun to work under Octave, for example, removing undocumented classdef features. The final goal is to have at least basic Chebfun features working on Octave. An additional goal would be making "pkg install chebfun.zip" work in Octave.<br />
<br />
This project is important for both technical reasons (to improve Octave's classdef support) and ethical reasons (to allow Chebfun to run without proprietary software).<br />
<br />
* '''Required skills'''<br />
: Octave m-file programming, C++, some familiarity with Approximation Theory (a branch of mathematics).<br />
* '''Difficulty'''<br />
: Medium to Hard (probably requires a deep dive into how Octave supports OO).<br />
* '''Potential mentors'''<br />
: Colin B. Macdonald, [[User:KaKiLa|KaKiLa]], Marco Caliari (?), Mike Miller (?), Carnë Draug (?), someone from Chebfun team (?).<br />
<br />
How to get started: learn about Chebfun, browse Octave's bug list for classdef-related bugs, play with other classdef projects (Pytave, https://github.com/cbm755/octsympy/issues/545)<br />
<br />
== Adding functionality to Forge packages ==<br />
=== EPA hydrology software suite ===<br />
Create native interfaces to the EPA software suites.<br />
<br />
Starting points<br />
* [https://forja.cica.es/projects/epanet-octave/ epanet-octave].<br />
* [https://github.com/OpenWaterAnalytics/ Open Water Analytics]<br />
<br />
==== SWMM ====<br />
** [https://www.epa.gov/water-research/storm-water-management-model-swmm Official page]<br />
** Check work done in [https://github.com/water-systems/MatSWMM MatSWMM] [http://digital.csic.es/bitstream/10261/132982/1/MatSWMM.pdf article]<br />
<br />
====EPANET====<br />
** [https://www.epa.gov/water-research/epanet Official page]<br />
<br />
====Required skills====<br />
: m-file scripting, C, C++, API knowledge, file I/O, classdef (optional). <br />
<br />
====Difficulty====<br />
: easy/medium<br />
<br />
====Mentor====<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== TISEAN package ===<br />
<br />
[http://www.mpipks-dresden.mpg.de/~tisean/Tisean_3.0.1/index.html TISEAN] is a suite of code for nonlinear time series analysis. It has been [http://wiki.octave.org/TISEAN_package partially re-implemented] as libre software. The objective is to integrate TISEAN as an Octave Forge package, as was done for the Control package.<br />
[[TISEAN_package | A lot has been completed]] but [[TISEAN_package:Procedure | there is still work left to do]].<br />
<br />
There are missing functions to do computations on spike trains, to simulate autoregresive models, to create specialized plots, etc. Do check [[TISEAN_package:Procedure#Table_of_functions|the progress of the project]] to see if you are interested.<br />
<br />
* [http://octave.sourceforge.net/tisean/overview.html Package help at source forge.] <br />
* [https://sourceforge.net/p/octave/tisean/ci/default/tree/ Package repository at source forge.] <br />
<br />
* '''Required skills'''<br />
: m-file scripting, C, C++, and FORTRAN API knowledge. <br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
=== Symbolic package ===<br />
<br />
Octave's [https://github.com/cbm755/octsympy Symbolic package] handles symbolic computing and other CAS tools. The main component of Symbolic is a pure m-file class "@sym" which uses the Python package [https://www.sympy.org SymPy] to do (most of) the actual computations. The package aims to expose the full functionality of SymPy while also providing a high-level of compatibility with the Matlab Symbolic Math Toolbox. The Symbolic package requires communication between Octave and Python. Recently, a GSoC2016 project successfully re-implemented this communication using the new [https://bitbucket.org/mtmiller/pytave Pytave tool].<br />
<br />
This project proposes to go further: instead of using Pytave only for the communication layer, we'll use it throughout the Symbolic project. For example, we might make "@sym" a subclass of "@pyobject". We also could stop using the "python_cmd" interface and use Pytave directly from methods. The main goal was already mentioned: to expose the *full functionality* of SymPy. For example, we would allow OO-style method calls such as "f.diff(x)" instead of "diff(f, x)".<br />
<br />
* '''Required skills'''<br />
: OO-programming with m-files, Python, and possibly C/C++ for improving Pytave (if needed).<br />
* '''Difficulty'''<br />
: easy/medium<br />
* '''Mentors and/or other team members'''<br />
: Colin B. Macdonald, Mike Miller, Abhinav Tripathi<br />
<br />
=== Interval package ===<br />
<br />
The [[Interval_package|interval package]] provides several arithmetic functions with accurate and guaranteed error bounds. Its development started in the end of 2014 and there is some fundamental functionality left to be implemented. See the [http://octave.sourceforge.net/interval/overview.html list of functions], basically any missing numeric Octave function could be implemented as an interval extension in the package. Potential projects:<br />
* Make the package support N-dimensional arrays, this requires less knowledge of interval arithmetic but can be a rather exhaustive job since it affects most function files in the package<br />
* Implement missing algorithms (as m-files)—difficulty and whether knowledge in interval analysis is required depends on the particular function. Of course, you may use papers which present such algorithms.<br />
* Improve existing algorithms (support more options for plotting, support more options for optimizers, increase accuracy, …)<br />
* Integrate functions from VERSOFT [http://uivtx.cs.cas.cz/~rohn/matlab/] in the package (some work has already been done and current progress is tracked in [[Interval_package#VERSOFT]]). This basically involves conversion of the documentation into Texinfo format, use Octave coding guidelines [https://www.gnu.org/software/octave/doc/v4.0.0/Octave-Sources-_0028m_002dfiles_0029.html] and to make sure that any called functions are available in the interval package. VERSOFT is originally based on INTLAB, a proprietary Octave package. Some functions may be missing. Also, the interval package doesn't support complex numbers, so it might not be possible to migrate some functions.<br />
* List more interesting use cases of interval arithmetic in the package's manual [https://octave.sourceforge.io/interval/package_doc/Examples.html]<br />
<br />
* '''Required skills'''<br />
: m-file scripting, basic knowledge of computer arithmetics (especially floating-point computations), interval analysis (depending on the functions to implement).<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Mentor and co-mentor'''<br />
: [[User:oheim|Oliver Heimlich]], [[User:Siko1056|Kai T. Ohlhus]]<br />
<br />
=== Mapping or Geometry package: Implement boolean operations on polygons ===<br />
<br />
The goal is to implement a Matlab-compatible set of boolean operations and supporting function for acting on polygons. These include the standard set of potential operations such as union/OR, intersection/AND, difference/subtraction, and exclusiveor/XOR.<br />
There is already an octave-forge package that implements a large part of this (the [http://octave.sourceforge.net/octclip/index.html octclip package]); however that does not do XOR; processing polygons with holes could be done better; and maintainability is hampered because all code comments etc. are in Spanish. Other than that, octclip performs fine.<br />
<br />
There are a variety of existing polygon libraries that implement much of the functionality and thus this would be incorporating the library into GNU Octave. The libraries with acceptable licenses are [http://www.angusj.com/delphi/clipper.php ClipperLib], [http://www.boost.org/doc/libs/1_60_0/libs/polygon/doc/index.htm Boost::Polygon], [https://github.com/boostorg/geometry Boost::Geometry], or [http://boolean.klaasholwerda.nl/bool.html kbool]. This would include implementing the following functions: polybool, ispolycw, poly2ccw, poly2cw, poly2fv, polyjoin, and polysplit. A partial implementation with ClipperLib and GPC can be found [https://sites.google.com/site/ulfgri/numerical/polybool here].<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++; C; familiarity with boolean logic; polygons, windings, and geometry<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Potential mentor'''<br />
: John Swensen<br />
: [[User:KaKiLa|KaKiLa]]<br />
<br />
== Infrastructure ==<br />
<br />
=== Jupyter Integration ===<br />
<br />
[http://jupyter.org Jupyter Notebook] is a web-based worksheet interface for computing. There is a [https://github.com/Calysto/octave_kernel Octave kernel for Jupyter]. This project seeks to improve that kernel to make Octave a first-class experience within the Jupyter Notebook.<br />
<br />
* '''Mentors'''<br />
: Colin B. Macdonald, Mike Miller, others?<br />
<br />
<br />
=== Using Python within Octave ===<br />
<br />
[https://bitbucket.org/mtmiller/pytave Pytave] allows one to call Python functions and interact with Python objects from within Octave .m file code and from the Octave command line interface. Ideally, Pytave will not be a separate project, but rather a core feature of Octave. This project aims to improve Pytave with the goal of merging the code into the core Octave code base. <br />
<br />
Based on a previous summer project related to Pytave, this work will consist of fast-paced collaborative software development based on tackling the [https://bitbucket.org/mtmiller/pytave/issues?status=new&status=open pytave issue list]. You would also be expected to participate in software design decisions and discussion, as well as improve documentation, doctests and unit tests. As an example of the sorts of decision decisions being made, note that Octave indexes from 1 whereas Python typically indexes from 0; in which cases is it appropriate to make this transparent to the user?<br />
<br />
* '''Mentors'''<br />
: Mike Miller, Colin B. Macdonald, Abhinav Tripathi, others?<br />
<br />
<br />
=== Octave Package management ===<br />
<br />
Octave management of installed packages is performed by a single function, {{codeline|pkg}}, which does pretty much everything. This function has a few limitations which are hard to implement with the current codebase, and will most likely require a full rewrite.<br />
<br />
The planned improvements are:<br />
<br />
* install from URLs<br />
* install and update from repositories (hg and git)<br />
* automatic handling of dependencies<br />
* easily load, update or check specific package versions<br />
* management of tests and demos in C++ sources of packages<br />
* more flexibility on dependencies, e.g., dependent on specific Octave build options or being dependent in one of multiple packages<br />
* support for multiple version packages<br />
* support for multiple Octave installs<br />
* support for system-wide and user installed packages<br />
<br />
The main objective of this project is to make {{codeline|pkg}} more user friendly and to make it a tool to foster third party participation in Octave.<br />
{{codeline|pkg}} needs to be more flexible and intelligent when dealing with packages, different verisons and different sources, as well as options on how to build and install the package.<br />
There are also advance features of pkg that are useful for testing packages. However, the current {{codeline|pkg}} also performs some maintenance functions which it probably should not.<br />
Instead a package for developers should be created with such tools.<br />
<br />
To do this enhacenment effectively, a refactoring of the current {{codeline|pkg}} code will be needed.<br />
[https://bitbucket.org/carandraug/octave/commits/branch/pkg This job was started once], but due to diverging and growing specifications, it stalled. <br />
In this project we will focus on the most needed features, keeping the requirements to a minimum. <br />
<br />
Many of these problems have been solved in other languages. Familiarity with how other languages handle this problem will be useful to come up with elegant solutions. In some cases, there are standards to follow. For example, there are specifications published by freedesktop.org about where files should go ([http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html base directory spec]) and Windows seems to have its own standards. See bugs {{bug|36477}} and {{bug|40444}} for more details.<br />
<br />
In addition, package names may start to collide very easily. One horrible way to workaround this by is choosing increasingly complex package names that give no hint on the package purpose. A much better is option is providing an Authority category like Perl 6 does. Nested packages is also an easy way to provide packages for specialized subjects (think {{codeline|image::morphology}}). A new {{codeline|pkg}} would think all this things now, or allow their implementation at a later time. Read the [[OEP:pkg|unfinished plan]] for more details.<br />
<br />
* '''Minimum requirements'''<br />
: Ability to read and write Octave code, experience with Octave packages, and understanding of the basics of autotools. The most important skill is software design.<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: [[User:KaKiLa|KaKiLa]], Carnë Draug, Carlo de Falco, Sebastian Schöps<br />
<br />
=== Command line suggestion feature ===<br />
<br />
Currently Octave has no mechanism for suggesting corrections to typographic errors on the command line. An autocomplete/suggestion function is provided (using the double-TAB shortcut), but recent discussions have indicated a desire for a more proactive measure to catch user error. Potential applicants are referred to bug {{bug|46881}} regarding the usage of grey vs. gray. <br />
<br />
Suggested improvements are:<br />
* provide one or more suggested corrections to the user when a command line entry produces an error.<br />
* recognition and suggested correction for apparent syntax errors<br />
* function suggestion(s) when a 'close' match is found (close remains to be defined)<br />
* multiple suggestions if more than one option seems likely, along with a user-friendly method of selecting the appropriate choice.<br />
* user selectable option to disable and/or customize the suggestion behavior<br />
* correct operation, or graceful degradation, whether Octave is run in GUI or command-line mode. <br />
<br />
As mentioned in the bug {{bug|46881}} discussion, this project has little-to-no relation to m-code compatibility. As such, emulation of the behavior of other software is not required, nor even necessarily desired. Octave is free to implement as simple or complex a solution to this feature request as is necessary to provide the best experience to the user. There may be tools, features, or code from other license-compatible projects that can be of use here, and the applicant would be encouraged to identify and leverage such resources as appropriate. <br />
<br />
* '''Minimum requirements'''<br />
: TBD<br />
* '''Difficulty'''<br />
: Easy to Medium.<br />
* '''Mentor'''<br />
: Undetermined<br />
<br />
== Image Analysis ==<br />
<br />
=== Improvements to N-dimensional image processing ===<br />
<br />
The image package has partial functionality for N-dimensional images. These images exist for example in medical imaging where slices from scans are assembled to form anatomical 3D images. If taken over time and at different laser wavelengths or light filters, they can also result in 5D images. Albeit less common, images with even more dimensions also exist. However, their existence is irrelevant since most of the image processing operations are mathematical operations which are independent of the number of dimensions.<br />
<br />
As part of GSoC 2013, the core functions for image IO, {{codeline|imwrite}} and {{codeline|imread}}, were extended to better support this type of images. Likewise, many functions in the image package, mostly morphology operators, were expanded to deal with this type of image. Since then, many other functions have been improved, sometimes completely rewritten, to abstract from the number of dimensions. In a certain way, supporting ND images is also related to choosing good algorithms since such large images tend to be quite large.<br />
<br />
This project will continue on the previous work, and be mentored by the previous GSoC student and current image package maintainer. Planning the project requires selection of functions lacking ND support and identifying their dependencies. For example, supporting {{codeline|imclose}} and {{codeline|imopen}} was better implemented by supporting {{codeline|imerode}} and {{codeline|imdilate}} which then propagated ND support to all of its dependencies. These dependencies need to be discovered first since often they are not being used yet, and may even be missing function. This project can also be about implementing functions that have [http://wiki.octave.org/Image_package#Missing_functions not yet been implemented]. Also note that while some functions in the image package will accept ND images as input, they are actually not correctly implemented and will give incorrect results.<br />
<br />
* '''Required skills'''<br />
: m-file scripting, and a fair amount of C++ since a lot of image analysis cannot be vectorized. Familiarity with common CS algorithms and willingness to read literature describing new algorithms will be useful. <br />
* '''Difficulty'''<br />
: Difficult.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
=== Improve Octave's image IO ===<br />
<br />
There are a lot of image formats. To handle this, Octave uses [http://www.graphicsmagick.org/ GraphicsMagic] (GM), a library capable of handling [http://www.graphicsmagick.org/formats.html a lot of them] in a single C++ interface. However, GraphicsMagick still has its limitations. The most important are:<br />
<br />
* GM has build option {{codeline|quantum}} which defines the bitdepth to use when reading an image. Building GM with high quantum means that images of smaller bitdepth will take a lot more memory when reading, but building it too low will make it impossible to read images of higher bitdepth. It also means that the image needs to always be rescaled to the correct range.<br />
* GM supports unsigned integers only thus incorrectly reading files such as TIFF with floating point data<br />
* GM hides away details of the image such as whether the image file is indexed. This makes it hard to access the real data stored on file.<br />
<br />
This project would implement better image IO for scientific file formats while leaving GM handle the others. Since TIFF is the de facto standard for scientific images, this should be done first. Among the targets for the project are:<br />
<br />
* implement the Tiff class which is a wrap around libtiff, using classdef. To avoid creating too many private __oct functions, this project could also create a C++ interface to declare new Octave classdef functions.<br />
* improve imread, imwrite, and imfinfo for tiff files using the newly created Tiff class<br />
* port the bioformats into Octave and prepare a package for it<br />
* investigate other image IO libraries<br />
* clean up and finish the dicom package to include into Octave core<br />
* prepare a matlab compatible implementation of the FITS package for inclusion in Octave core<br />
<br />
* '''Required skills'''<br />
: Knowledge of C++ and C since most libraries are written in those languages.<br />
* '''Difficulty'''<br />
: Medium.<br />
* '''Potential mentor'''<br />
: Carnë Draug<br />
<br />
<br />
<br />
<br />
<br />
<br />
<noinclude><br />
[[Category:Summer of Code]]<br />
[[Category:Project Ideas]]<br />
</noinclude></div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9942OctConf 20172017-03-10T10:50:09Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>We are happy to announce the upcoming Octave Conference 2017 to be held at [http://home.cern CERN], near Geneva, Switzerland, from March 20th until March 22nd. The Local Organising Committee is happy and proud that CERN will host this event for at least two reasons: Octave [2] is a fundamental tool of analysis and research for hundreds of CERN scientists; Octave and CERN share and promote the same values of openness, cooperation, diversity, quality and commitment.<br />
<br />
The three-day event will be an opportunity for sharing experiences, planning the future of Octave and promoting its use among the scientific community and beyond. There will two open sessions on Monday and Tuesday showcasing Octave and some interesting and successful Octave stories.<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
We are working out the details of the programme, and the call for contributions and abstract is still open. You are all invited to submit an abstract and present your experience with Octave at the conference!<br />
<br />
We are hopeful that the key members of the Octave development team will make it, both from oversea and from Europe. You can find more updated information on the programme in the [https://indico.cern.ch/event/609833 CERN's OctConf webpage] and in here.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Social activities ===<br />
<br />
Two social events have been foreseen, besides the coffee and the lunch breaks:<br />
* A unique visit to [http://visit.cern/tours CERN]<br />
* A [https://en.wikipedia.org/wiki/Fondue Fondue] dinner down-town Geneva<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
== Tips and tricks ==<br />
A normal lunch at CERN costs about 15 CHF, inclusive of one coffee and one delicious dessert.<br />
<br />
A bus ride from the airport to CERN is free of charge, if you take a ticket at the vending machine in the baggage claim area. Should you miss that vending machine, a ticket will cost you 3.00 CHF. https://genevalunch.com/guides/travel/the-cheerful-traveler-geneva-airport-public-transport/<br />
<br />
<br />
== Accommodation ==<br />
<br />
The conference will take place in the CERN's main site (Meyrin). You can try your luck and search for an accommodation in one of the [http://smb-dep.web.cern.ch/en/CERN_Housing CERN Hostels].<br />
<br />
Should the CERN hostels be full, or should you prefer to stay in Geneva, we advise you to consult your favourite on-line booking portal (www.booking.com, www.tripadvisor.com, www.trivago.com, www.expedia.com etc.) and to contact the hotel directly in order to identify the lowest tariff available for CERN users and collaborators (preferential tariffs may apply in some cases).<br />
<br />
Hotels in the vicinity of "Gare Cornavin" (Geneva's main railway station), or along "Route de Meyrin", are particularly recommended. Tram number 18 links Gare Cornavin to CERN in 20' (see [http://www.tpg.ch/ timetable on the TPG's webpage]). <br />
<br />
Notice that, by staying in hotel, youth hostel or at a campsite, you are entitled to receive a personal and non transferable Geneva Transport Card for free, which will allow you to use the whole public transportation system of Geneva for the length of your stay for free. This includes buses, trams, trains, and yellow taxi-boats - Mouettes. Just ask for it upon arrival on the reception.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open slot</td><br />
<td>GSoC project: Exponential Integrators<br/>(Chiara Segala)</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-9:45</td><br />
<td rowspan="2">Octave for N dimensions and microscope image processing (Carnë Draug / David Miguel Susano Pinto)</td><br />
<td rowspan="2">SOCIS project: Improve iterative methods for sparse linear systems<br/>(Cristiano Dorigo)</td><br />
</tr><br />
<tr><br />
<td>9:45-10:00</td><br />
<td rowspan="5">Visit to CERN sites</td><br />
<br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Octave for Particle Accelerator Design (A. Latina)</td><br />
<td>Support of free software in public institutions: the KiCad case (J. Serrano)</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>[https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html publish] your code with Octave (Kai T. Ohlhus)</td><br />
<td>Discussion</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>Open slot</td><br />
<td>GSoC project: ode15{i,s} (20 min)<br/>The future of the Neural Network package (15 min)<br/>(Francesco Faccio)</td><br />
</tr><br />
<tr><br />
<td>12:00-12:45</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
<td>8/16-bit simulation with GNU Octave (Andreas Stahel)</td><br />
</tr><br />
<tr><br />
<td><br/>12:45-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="2">Status of Octave - 1h<br/>(John W. Eaton) </td><br />
<td>Technical overview of user code parallelization (Olaf Till)</td><br />
<td rowspan="3">Unconference</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
<td rowspan="2">Open Slot (Plenary session: CERN main auditorium)</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
<td>MOOC: Matlab and Octave for beginners (Simone Deparis)</td><br />
<br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td>VSDP – A GNU Octave/MATLAB<sup>&reg;</sup> toolbox for verified semidefinite-quadratic-linear programming</td><br />
<td>[[User:Siko1056|Kai T. Ohlhus]]</td><br />
</tr><br />
<tr><br />
<td>Characterization of high-Tc granular superconductors in a magnetic fields</td><br />
<td>Michele Manzini</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:JordiGH|Jordi Gutiérrez Hermoso]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]]<br />
* [[User:Oheim|Oliver Heimlich]] (Tuesday–Wednesday)<br />
* [[User:Carandraug|Carnë Draug]]<br />
* [[User:Andy1978|Andreas Weber]]<br />
* Valentin Ortega<br />
* Andrea Latina<br />
* Andreas Stahel<br />
* [[User:CdF|Carlo de Falco]] (likely to attend, probably one day only)<br />
* Cristiano Dorigo<br />
* Michele Ginesi<br />
* Chiara Segala<br />
* [[User:pantxo|Pantxo Diribarne]] (likely to attend, probably one day only)<br />
* Marco Caliari (arrival in Monday afternoon)<br />
* Anna Ferrarini<br />
* Elisa Frison<br />
* Sara Stillavati<br />
* Olaf Till<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9928OctConf 20172017-03-05T15:00:16Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>We are happy to announce the upcoming Octave Conference 2017 to be held at [http://home.cern CERN], near Geneva, Switzerland, from March 20th until March 22nd. The Local Organising Committee is happy and proud that CERN will host this event for at least two reasons: Octave [2] is a fundamental tool of analysis and research for hundreds of CERN scientists; Octave and CERN share and promote the same values of openness, cooperation, diversity, quality and commitment.<br />
<br />
The three-day event will be an opportunity for sharing experiences, planning the future of Octave and promoting its use among the scientific community and beyond. There will two open sessions on Monday and Tuesday showcasing Octave and some interesting and successful Octave stories.<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
We are working out the details of the programme, and the call for contributions and abstract is still open. You are all invited to submit an abstract and present your experience with Octave at the conference!<br />
<br />
We are hopeful that the key members of the Octave development team will make it, both from oversea and from Europe. You can find more updated information on the programme in the [https://indico.cern.ch/event/609833 CERN's OctConf webpage] and in here.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Social activities ===<br />
<br />
Two social events have been foreseen, besides the coffee and the lunch breaks:<br />
* A unique visit to [http://visit.cern/tours CERN]<br />
* A [https://en.wikipedia.org/wiki/Fondue Fondue] dinner down-town Geneva<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
== Tips and tricks ==<br />
A normal lunch at CERN costs about 15 CHF, inclusive of one coffee and one delicious dessert.<br />
<br />
A bus ride from the airport to CERN is free of charge, if you take a ticket at the vending machine in the baggage claim area. Should you miss that vending machine, a ticket will cost you 3.00 CHF. https://genevalunch.com/guides/travel/the-cheerful-traveler-geneva-airport-public-transport/<br />
<br />
<br />
== Accommodation ==<br />
<br />
The conference will take place in the CERN's main site (Meyrin). You can try your luck and search for an accommodation in one of the [http://smb-dep.web.cern.ch/en/CERN_Housing CERN Hostels].<br />
<br />
Should the CERN hostels be full, or should you prefer to stay in Geneva, we advise you to consult your favourite on-line booking portal (www.booking.com, www.tripadvisor.com, www.trivago.com, www.expedia.com etc.) and to contact the hotel directly in order to identify the lowest tariff available for CERN users and collaborators (preferential tariffs may apply in some cases).<br />
<br />
Hotels in the vicinity of "Gare Cornavin" (Geneva's main railway station), or along "Route de Meyrin", are particularly recommended. Tram number 18 links Gare Cornavin to CERN in 20' (see [http://www.tpg.ch/ timetable on the TPG's webpage]). <br />
<br />
Notice that, by staying in hotel, youth hostel or at a campsite, you are entitled to receive a personal and non transferable Geneva Transport Card for free, which will allow you to use the whole public transportation system of Geneva for the length of your stay for free. This includes buses, trams, trains, and yellow taxi-boats - Mouettes. Just ask for it upon arrival on the reception.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open slot</td><br />
<td>GSoC project: Exponential Integrators<br/>(Chiara Segala)</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Octave for N dimensions and microscope image processing (Carnë Draug / David Miguel Susano Pinto)</td><br />
<td>SOCIS project: Improve iterative methods for sparse linear systems<br/>(Cristiano Dorigo)</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Octave for Particle Accelerator Design (A. Latina)</td><br />
<td>Support of free software in public institutions: the KiCad case (J. Serrano)</td><br />
<td>MOOC: Matlab and Octave for beginners (Simone Deparis)</td> <br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>[https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html publish] your code with Octave (Kai T. Ohlhus)</td><br />
<td>Discussion</td><br />
<td rowspan="2">SIAM event by EPFL<br/>(To be confirmed. Move it to the first day if you think it would be better)</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>Open slot</td><br />
<td>GSoC project: ode15{i,s} (20 min)<br/>The future of the Neural Network package (15 min)<br/>(Francesco Faccio)</td><br />
</tr><br />
<tr><br />
<td>12:00-12:45</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
<td>8/16-bit simulation with GNU Octave (Andreas Stahel)</td><br />
</tr><br />
<tr><br />
<td><br/>12:45-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Plenary session: CERN main auditorium)<br/>Status of Octave - 1h<br/>(John W. Eaton) </td><br />
<td>Technical overview of user code parallelization (Olaf Till)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
<td rowspan="2">Open Slot (Plenary session: CERN main auditorium)</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td>VSDP – A GNU Octave/MATLAB<sup>&reg;</sup> toolbox for verified semidefinite-quadratic-linear programming</td><br />
<td>[[User:Siko1056|Kai T. Ohlhus]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:JordiGH|Jordi Gutiérrez Hermoso]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]]<br />
* [[User:Oheim|Oliver Heimlich]] (Tuesday–Wednesday)<br />
* [[User:Carandraug|Carnë Draug]]<br />
* [[User:Andy1978|Andreas Weber]]<br />
* Valentin Ortega<br />
* Andrea Latina<br />
* Andreas Stahel<br />
* [[User:CdF|Carlo de Falco]] (likely to attend, probably one day only)<br />
* Cristiano Dorigo<br />
* Michele Ginesi<br />
* Chiara Segala<br />
* [[User:pantxo|Pantxo Diribarne]] (likely to attend, probably one day only)<br />
* Marco Caliari (arrival in Monday afternoon)<br />
* Anna Ferrarini<br />
* Elisa Frison<br />
* Sara Stillavati<br />
* Olaf Till<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9896OctConf 20172017-02-22T10:41:59Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>We are happy to announce the upcoming Octave Conference 2017 to be held at [http://home.cern CERN], near Geneva, Switzerland, from March 20th until March 22nd. The Local Organising Committee is happy and proud that CERN will host this event for at least two reasons: Octave [2] is a fundamental tool of analysis and research for hundreds of CERN scientists; Octave and CERN share and promote the same values of openness, cooperation, diversity, quality and commitment.<br />
<br />
The three-day event will be an opportunity for sharing experiences, planning the future of Octave and promoting its use among the scientific community and beyond. There will two open sessions on Monday and Tuesday showcasing Octave and some interesting and successful Octave stories.<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
We are working out the details of the programme, and the call for contributions and abstract is still open. You are all invited to submit an abstract and present your experience with Octave at the conference!<br />
<br />
We are hopeful that the key members of the Octave development team will make it, both from oversea and from Europe. You can find more updated information on the programme in the [https://indico.cern.ch/event/609833 CERN's OctConf webpage] and in here.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Social activities ===<br />
<br />
Two social events have been foreseen, besides the coffee and the lunch breaks:<br />
* A unique visit to [http://visit.cern/tours CERN]<br />
* A [https://en.wikipedia.org/wiki/Fondue Fondue] dinner down-town Geneva<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
== Tips and tricks ==<br />
A normal lunch at CERN costs about 15 CHF, inclusive of one coffee and one delicious dessert.<br />
<br />
A bus ride from the airport to CERN is free of charge, if you take a ticket at the vending machine in the baggage claim area. Should you miss that vending machine, a ticket will cost you 3.00 CHF. https://genevalunch.com/guides/travel/the-cheerful-traveler-geneva-airport-public-transport/<br />
<br />
<br />
== Accommodation ==<br />
<br />
The conference will take place in the CERN's main site (Meyrin). You can try your luck and search for an accommodation in one of the [http://smb-dep.web.cern.ch/en/CERN_Housing CERN Hostels].<br />
<br />
Should the CERN hostels be full, or should you prefer to stay in Geneva, we advise you to consult your favourite on-line booking portal (www.booking.com, www.tripadvisor.com, www.trivago.com, www.expedia.com etc.) and to contact the hotel directly in order to identify the lowest tariff available for CERN users and collaborators (preferential tariffs may apply in some cases).<br />
<br />
Hotels in the vicinity of "Gare Cornavin" (Geneva's main railway station), or along "Route de Meyrin", are particularly recommended. Tram number 18 links Gare Cornavin to CERN in 20' (see [http://www.tpg.ch/ timetable on the TPG's webpage]). <br />
<br />
Notice that, by staying in hotel, youth hostel or at a campsite, you are entitled to receive a personal and non transferable Geneva Transport Card for free, which will allow you to use the whole public transportation system of Geneva for the length of your stay for free. This includes buses, trams, trains, and yellow taxi-boats - Mouettes. Just ask for it upon arrival on the reception.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open slot</td><br />
<td>GSoC project: Exponential Integrators<br/>(Chiara Segala)</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Octave for N dimensions and microscope image processing (Carnë Draug / David Miguel Susano Pinto)</td><br />
<td>SOCIS project: Improve iterative methods for sparse linear systems<br/>(Cristiano Dorigo)</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Designing Particle Accelerators using Octave (A. Latina)</td><br />
<td>Open Slot</td><br />
<td>Unconference</td> <br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>[https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html publish] your code with Octave (Kai T. Ohlhus)</td><br />
<td>Open Slot</td><br />
<td rowspan="2">SIAM event by EPFL<br/>(To be confirmed. Move it to the first day if you think it would be better)</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>GSoC project: ode15{i,s}<br/>(Francesco Faccio)</td><br />
<td>The future of the Neural Network package<br/>(Francesco Faccio)</td><br />
</tr><br />
<tr><br />
<td>12:00-12:45</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
<td>8/16-bit simulation with GNU Octave (Andreas Stahel)</td><br />
</tr><br />
<tr><br />
<td><br/>12:45-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Plenary session: CERN main auditorium)<br/>Status of Octave - 1h<br/>(John W. Eaton) </td><br />
<td rowspan="3">Open Slot (Plenary session: CERN main auditorium)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td>VSDP: Verified SemiDefinite Programming</td><br />
<td>[[User:Siko1056|Kai T. Ohlhus]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]]<br />
* [[User:Oheim|Oliver Heimlich]] (Tuesday–Wednesday)<br />
* [[User:Carandraug|Carnë Draug]]<br />
* [[User:Andy1978|Andreas Weber]] (likely to attend but have to wait for the final okay from employer)<br />
* Valentin Ortega Clavero (likely to attend but have to wait for the final okay from employer)<br />
* Andrea Latina<br />
* Andreas Stahel<br />
* [[User:CdF|Carlo de Falco]] (likely to attend, probably one day only)<br />
* Cristiano Dorigo<br />
* Michele Ginesi<br />
* Chiara Segala<br />
* [[User:pantxo|Pantxo Diribarne]] (likely to attend, probably one day only)<br />
* Marco Caliari (arrival in Monday afternoon)<br />
* Anna Ferrarini<br />
* Elisa Frison<br />
* Sara Stillavati<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9892OctConf 20172017-02-21T11:03:13Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>We are happy to announce the upcoming Octave Conference 2017 to be held at [http://home.cern CERN], near Geneva, Switzerland, from March 20th until March 22nd. The Local Organising Committee is happy and proud that CERN will host this event for at least two reasons: Octave [2] is a fundamental tool of analysis and research for hundreds of CERN scientists; Octave and CERN share and promote the same values of openness, cooperation, diversity, quality and commitment.<br />
<br />
The three-day event will be an opportunity for sharing experiences, planning the future of Octave and promoting its use among the scientific community and beyond. There will two open sessions on Monday and Tuesday showcasing Octave and some interesting and successful Octave stories.<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
We are working out the details of the programme, and the call for contributions and abstract is still open. You are all invited to submit an abstract and present your experience with Octave at the conference!<br />
<br />
We are hopeful that the key members of the Octave development team will make it, both from oversea and from Europe. You can find more updated information on the programme in the [https://indico.cern.ch/event/609833 CERN's OctConf webpage] and in here.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Social activities ===<br />
<br />
Two social events have been foreseen, besides the coffee and the lunch breaks:<br />
* A unique visit to [http://visit.cern/tours CERN]<br />
* A [https://en.wikipedia.org/wiki/Fondue Fondue] dinner down-town Geneva<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
== Tips and tricks ==<br />
A normal lunch at CERN costs about 15 CHF, inclusive of one coffee and one delicious dessert.<br />
<br />
A bus ride from the airport to CERN is free of charge, if you take a ticket at the vending machine in the baggage claim area. Should you miss that vending machine, a ticket will cost you 3.00 CHF. https://genevalunch.com/guides/travel/the-cheerful-traveler-geneva-airport-public-transport/<br />
<br />
<br />
== Accommodation ==<br />
<br />
The conference will take place in the CERN's main site (Meyrin). You can try your luck and search for an accommodation in one of the [http://smb-dep.web.cern.ch/en/CERN_Housing CERN Hostels].<br />
<br />
Should the CERN hostels be full, or should you prefer to stay in Geneva, we advise you to consult your favourite on-line booking portal (www.booking.com, www.tripadvisor.com, www.trivago.com, www.expedia.com etc.) and to contact the hotel directly in order to identify the lowest tariff available for CERN users and collaborators (preferential tariffs may apply in some cases).<br />
<br />
Hotels in the vicinity of "Gare Cornavin" (Geneva's main railway station), or along "Route de Meyrin", are particularly recommended. Tram number 18 links Gare Cornavin to CERN in 20' (see [http://www.tpg.ch/ timetable on the TPG's webpage]). <br />
<br />
Notice that, by staying in hotel, youth hostel or at a campsite, you are entitled to receive a personal and non transferable Geneva Transport Card for free, which will allow you to use the whole public transportation system of Geneva for the length of your stay for free. This includes buses, trams, trains, and yellow taxi-boats - Mouettes. Just ask for it upon arrival on the reception.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Proposed talks ===<br />
<br />
* "GNU Octave for fluorescence microscopy / Image processing in N dimensions" -- Carnë Draug / David Miguel Susano Pinto (Micron Oxford, University of Oxford)<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open Slot</td><br />
<td>GSoC project: Exponential Integrators<br/>(Chiara Segala)</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Open Slot</td><br />
<td>SOCIS project: Improve iterative methods for sparse linear systems<br/>(Cristiano Dorigo)</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Designing Particle Accelerators using Octave (A. Latina)</td><br />
<td>Open Slot</td><br />
<td rowspan="3">Unconference</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>[https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html publish] your code with Octave (Kai T. Ohlhus)</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>GSoC project: ode15{i,s}<br/>(Francesco Faccio)</td><br />
<td>The future of the Neural Network package<br/>(Francesco Faccio)</td><br />
</tr><br />
<tr><br />
<td>12:00-12:45</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
<td>8/16-bit simulation with GNU Octave (Andreas Stahel)</td><br />
</tr><br />
<tr><br />
<td><br/>12:45-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Plenary session: CERN main auditorium)<br/>Status of Octave - 1h<br/>(John W. Eaton) </td><br />
<td rowspan="3">Open Slot (Plenary session: CERN main auditorium)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td>VSDP: Verified SemiDefinite Programming</td><br />
<td>[[User:Siko1056|Kai T. Ohlhus]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]]<br />
* [[User:Oheim|Oliver Heimlich]] (Tuesday–Wednesday)<br />
* [[User:Carandraug|Carnë Draug]]<br />
* [[User:Andy1978|Andreas Weber]] (likely to attend but have to wait for the final okay from employer)<br />
* Valentin Ortega Clavero (likely to attend but have to wait for the final okay from employer)<br />
* Andrea Latina<br />
* Andreas Stahel<br />
* [[User:CdF|Carlo de Falco]] (likely to attend, probably one day only)<br />
* Cristiano Dorigo<br />
* Michele Ginesi<br />
* Chiara Segala<br />
* [[User:pantxo|Pantxo Diribarne]] (likely to attend, probably one day only)<br />
* Marco Caliari (arrival in Monday afternoon)<br />
* Anna Ferrarini<br />
* Elisa Frison<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9858OctConf 20172017-02-08T16:07:21Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>We are happy to announce the upcoming Octave Conference 2017 to be held at [http://home.cern CERN], near Geneva, Switzerland, from March 20th until March 22nd. The Local Organising Committee is happy and proud that CERN will host this event for at least two reasons: Octave [2] is a fundamental tool of analysis and research for hundreds of CERN scientists; Octave and CERN share and promote the same values of openness, cooperation, diversity, quality and commitment.<br />
<br />
The three-day event will be an opportunity for sharing experiences, planning the future of Octave and promoting its use among the scientific community and beyond. There will two open sessions on Monday and Tuesday showcasing Octave and some interesting and successful Octave stories.<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
We are working out the details of the programme, and the call for contributions and abstract is still open. You are all invited to submit an abstract and present your experience with Octave at the conference!<br />
<br />
We are hopeful that the key members of the Octave development team will make it, both from oversea and from Europe. You can find more updated information on the programme in the [https://indico.cern.ch/event/609833 CERN's OctConf webpage] and in here.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Social activities ===<br />
<br />
Two social events have been foreseen, besides the coffee and the lunch breaks:<br />
* A unique visit to [http://visit.cern/tours CERN]<br />
* A [https://en.wikipedia.org/wiki/Fondue Fondue] dinner down-town Geneva<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
<br />
== Accommodation ==<br />
<br />
The conference will take place in the CERN's main site (Meyrin). You can try your luck and search for an accommodation in one of the [http://smb-dep.web.cern.ch/en/CERN_Housing CERN Hostels].<br />
<br />
Should the CERN hostels be full, or should you prefer to stay in Geneva, we advise you to consult your favourite on-line booking portal (www.booking.com, www.tripadvisor.com, www.trivago.com, www.expedia.com etc.) and to contact the hotel directly in order to identify the lowest tariff available for CERN users and collaborators (preferential tariffs may apply in some cases).<br />
<br />
Hotels in the vicinity of "Gare Cornavin" (Geneva's main railway station), or along "Route de Meyrin", are particularly recommended. Tram number 18 links Gare Cornavin to CERN in 20' (see [http://www.tpg.ch/ timetable on the TPG's webpage]). <br />
<br />
Notice that, by staying in hotel, youth hostel or at a campsite, you are entitled to receive a personal and non transferable Geneva Transport Card for free, which will allow you to use the whole public transportation system of Geneva for the length of your stay for free. This includes buses, trams, trains, and yellow taxi-boats - Mouettes. Just ask for it upon arrival on the reception.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td>Unconference</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>[https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html publish] your code with Octave (Kai T. Ohlhus)</td><br />
<td>Open Slot</td><br />
<td rowspan="2">SIAM event by EPFL<br/>(To be confirmed. Move it to the first day if you think it would be better)</td><br />
<br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>GSoC project: ode15{i,s}<br/>(Francesco Faccio)</td><br />
<td>The future of the Neural Network package<br/>(Francesco Faccio)</td><br />
</tr><br />
<tr><br />
<td>12:00-12:45</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
<td>8/16-bit simulation with GNU Octave (Andreas Stahel)</td>8<br />
</tr><br />
<tr><br />
<td><br/>12:45-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td>VSDP: Verified SemiDefinite Programming</td><br />
<td>[[User:Siko1056|Kai T. Ohlhus]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:rik|Rik]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]]<br />
* [[User:Oheim|Oliver Heimlich]] (probably only 2 days, waits for permission from wife)<br />
* [[User:Carandraug|Carnë Draug]] (likely to attend but unsure. Will only be able to confirm on the 10th of February)<br />
* [[User:Andy1978|Andreas Weber]] (likely to attend but have to wait for the final okay from employer)<br />
* Valentin Ortega Clavero (likely to attend but have to wait for the final okay from employer)<br />
* Andrea Latina<br />
* Andreas Stahel<br />
* [[User:CdF|Carlo de Falco]] (likely to attend, probably one day only)<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9857OctConf 20172017-02-08T15:57:26Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>We are happy to announce the upcoming Octave Conference 2017 to be held at [http://home.cern CERN], near Geneva, Switzerland, from March 20th until March 22nd. The Local Organising Committee is happy and proud that CERN will host this event for at least two reasons: Octave [2] is a fundamental tool of analysis and research for hundreds of CERN scientists; Octave and CERN share and promote the same values of openness, cooperation, diversity, quality and commitment.<br />
<br />
The three-day event will be an opportunity for sharing experiences, planning the future of Octave and promoting its use among the scientific community and beyond. There will two open sessions on Monday and Tuesday showcasing Octave and some interesting and successful Octave stories.<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
We are working out the details of the programme, and the call for contributions and abstract is still open. You are all invited to submit an abstract and present your experience with Octave at the conference!<br />
<br />
We are hopeful that the key members of the Octave development team will make it, both from oversea and from Europe. You can find more updated information on the programme in the [https://indico.cern.ch/event/609833 CERN's OctConf webpage] and in here.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Social activities ===<br />
<br />
Two social events have been foreseen, besides the coffee and the lunch breaks:<br />
* A unique visit to [http://visit.cern/tours CERN]<br />
* A [https://en.wikipedia.org/wiki/Fondue Fondue] dinner down-town Geneva<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
<br />
== Accommodation ==<br />
<br />
The conference will take place in the CERN's main site (Meyrin). You can try your luck and search for an accommodation in one of the [http://smb-dep.web.cern.ch/en/CERN_Housing CERN Hostels].<br />
<br />
Should the CERN hostels be full, or should you prefer to stay in Geneva, we advise you to consult your favourite on-line booking portal (www.booking.com, www.tripadvisor.com, www.trivago.com, www.expedia.com etc.) and to contact the hotel directly in order to identify the lowest tariff available for CERN users and collaborators (preferential tariffs may apply in some cases).<br />
<br />
Hotels in the vicinity of "Gare Cornavin" (Geneva's main railway station), or along "Route de Meyrin", are particularly recommended. Tram number 18 links Gare Cornavin to CERN in 20' (see [http://www.tpg.ch/ timetable on the TPG's webpage]). <br />
<br />
Notice that, by staying in hotel, youth hostel or at a campsite, you are entitled to receive a personal and non transferable Geneva Transport Card for free, which will allow you to use the whole public transportation system of Geneva for the length of your stay for free. This includes buses, trams, trains, and yellow taxi-boats - Mouettes. Just ask for it upon arrival on the reception.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="3">Unconference</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>[https://www.gnu.org/software/octave/doc/interpreter/XREFpublish.html publish] your code with Octave (Kai T. Ohlhus)</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>GSoC project: ode15{i,s}<br/>(Francesco Faccio)</td><br />
<td>The future of the Neural Network package<br/>(Francesco Faccio)</td><br />
</tr><br />
<tr><br />
<td>12:00-12:45</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
<td>8/16-bit simulation with GNU Octave (Andreas Stahel)</td>8<br />
</tr><br />
<tr><br />
<td><br/>12:45-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td>VSDP: Verified SemiDefinite Programming</td><br />
<td>[[User:Siko1056|Kai T. Ohlhus]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:rik|Rik]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]]<br />
* [[User:Oheim|Oliver Heimlich]] (probably only 2 days, waits for permission from wife)<br />
* [[User:Carandraug|Carnë Draug]] (likely to attend but unsure. Will only be able to confirm on the 10th of February)<br />
* [[User:Andy1978|Andreas Weber]] (likely to attend but have to wait for the final okay from employer)<br />
* Valentin Ortega Clavero (likely to attend but have to wait for the final okay from employer)<br />
* Andrea Latina<br />
* Andreas Stahel<br />
* [[User:CdF|Carlo de Falco]] (likely to attend, probably one day only)<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9804OctConf 20172017-02-02T20:41:58Z<p>Francesco Faccio: /* Participants */</p>
<hr />
<div>OctConf 2017 will take place at CERN, Geneva, Switzerland for three days from March 20 through March 22. <br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="4">Unconference</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>GSoC project: ode15{i,s}<br/>(Francesco Faccio)</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>12:00-12:30</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
</tr><br />
<tr><br />
<td><br/>12:30-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]] (need funding for travel)<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:rik|Rik]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]] (waits for permission from employer)<br />
* [[User:Oheim|Oliver Heimlich]] (probably only 2 days, waits for permission from wife)<br />
* [[User:Carandraug|Carnë Draug]] (likely to attend but unsure. Will only be able to confirm the week before)<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9803OctConf 20172017-02-02T20:41:27Z<p>Francesco Faccio: /* Schedule */</p>
<hr />
<div>OctConf 2017 will take place at CERN, Geneva, Switzerland for three days from March 20 through March 22. <br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
In addition, *please* add your name to the Participants section of this page so we can plan appropriately.<br />
<br />
== Location ==<br />
<br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at [http://home.cern/ CERN] (European Center for Nuclear Research)<br />
<br />
At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. They use the world's largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles. The particles are made to collide together at close to the speed of light. The process gives the physicists clues about how the particles interact, and provides insights into the fundamental laws of nature.<br />
The instruments used at CERN are purpose-built particle accelerators and detectors. Accelerators boost beams of particles to high energies before the beams are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.<br />
<br />
Founded in 1954, the CERN laboratory sits astride the Franco-Swiss border near Geneva. It was one of Europe's first joint ventures and now has 22 member states.<br />
<br />
=== Travelling ===<br />
The information below is taken from [http://visit.cern/exhibitions/how-get-cern CERN instructions].<br />
Please check that link for further details.<br />
<br />
[http://visit.cern/sites/visits.web.cern.ch/files/files/exhibitions/access-map.pdf How to get to CERN infographics]<br />
<br />
CERN Reception - Meyrin<br />
<br />
CERN - European Organization for Nuclear Research<br />
385 route de Meyrin<br />
CH-1217 Meyrin - Geneva<br />
Switzerland<br />
<br />
* GPS Coordinates<br />
Latitude: 46.2314284<br />
<br />
Longitude: 6.0539718<br />
<br />
<br />
==== By train ====<br />
Coming from the Geneva railway station at Cornavin<br />
<br />
Tram - Take the number 18 tram to "CERN" which is the final stop at the CERN entrance.<br />
<br />
Ticket costs 3 CHF full-fare / 2 CHF reduced-fare (Ticket "Tout Genève" on the ticket machine). <br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
==== By car ====<br />
<br />
* From Switzerland<br />
<br />
Follow signs for "Aéroport", "Lyon" and "Meyrin".<br />
<br />
Once you are in Meyrin, follow signs for "St. Genis" (which is just beyond the border, in France). <br />
<br />
Before reaching St Genis, the CERN site is on your left on "Route de Meyrin", just before you reach the border.<br />
<br />
* From France (département of Ain)<br />
<br />
Follow signs for "Gex" or "St. Genis". <br />
When you reach the border, CERN is on your right immediately after passing through customs.<br />
<br />
See [http://visit.cern/exhibitions/how-get-cern-car Parking] for parking information.<br />
<br />
==== By plane ====<br />
Coming from the Geneva International Airport at Cointrin<br />
<br />
Taxi - approximately 35CHF.<br />
<br />
Bus - First take a public transport ticket from the machine you will find at the exit to the baggage collection hall, just before customs control. Then:<br />
<br />
Option 1: Take bus Y direction "CERN" and get off at the CERN stop opposite the large Globe and the CERN site.<br />
<br />
Option 2: Take bus 23, 28 or 57 and get off at the stop "Blandonnet" and then catch the Tram number 18, final stop "CERN".<br />
<br />
See the [http://www.tpg.ch/ TPG] web site for full details.<br />
<br />
== Dates ==<br />
<br />
The conference will run for three days from Monday, March 20th through Wednesday, March 22nd.<br />
<br />
== Suggestions for Sessions ==<br />
<br />
Approximately half of each day will be devoted to presentations. The remainder will be used for informal discussions, code sprints, etc.<br />
<br />
Please propose session topics in the schedule below. The actual time slot you pick is not important--we can re-arrange the schedule later--but we need to know what topics are of interest.<br />
<br />
In addition, if you have a poster, rather than a full presentation, there is a separate sign-up sheet below.<br />
<br />
=== Schedule ===<br />
During the daytime: CERN offers many areas where people can socialize and/or discuss, informally. For instance, the CERN main restaurant is open until 23:00 (11:00 PM).<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="220">Monday<br/>(General GNU Octave day)</th><br />
<th width="220">Tuesday<br/>(GNU Octave Packages day)</th><br />
<th width="250">Wednesday<br/>(Libre and Open Source Software day)</th><br />
</tr><br />
<tr><br />
<td>9:00-9:30</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="2">Unconference</td><br />
</tr><br />
<tr><br />
<td>9:30-10:00</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
<td rowspan="4">Unconference</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td>Open Slot</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td>GSoC project: ode15{i,s}<br/>(Francesco Faccio)</td><br />
<td>Open Slot</td><br />
</tr><br />
<tr><br />
<td>12:00-12:30</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
</tr><br />
<tr><br />
<td><br/>12:30-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Open Slot (Pleanry session: CERN main auditorium)</td><br />
<td rowspan="3">Visit to CERN sites</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Code Sprint</strong></td><br />
<td><strong>Organization of OctConf2018</strong></td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td rowspan="2">Fondue night (alternative 1)</td><br />
<td rowspan="2">Fondue night (alternative 2)</td><br />
<td rowspan="2">Closing and Farewell</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
<br />
If you have a poster demonstrating how you use Octave to address an application in your field please add your name and poster topic to the list below. We will schedule an appropriately sized space based on the number of posters.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td>Fast approximation of complicated simulators</td><br />
<td>[[User:KaKiLa |JuanPi Carbajal]]</td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
To register officially, please use the CERN conference manager [https://indico.cern.ch/event/609833/ Indico].<br />
<br />
* [[User:KaKiLa|JuanPi Carbajal]]<br />
* [[User:Francesco Faccio|Francesco Faccio]]<br />
* [[User:jwe|John W. Eaton]] (need funding for travel)<br />
* [[User:rik|Rik]] (need funding for travel)<br />
* [[User:Doug|Douglas Stewart]]<br />
* [[User:Siko1056|Kai T. Ohlhus]] (waits for permission from employer)<br />
* [[User:Oheim|Oliver Heimlich]] (probably only 2 days, waits for permission from wife)<br />
* [[User:Carandraug|Carnë Draug]] (likely to attend but unsure. Will only be able to confirm the week before)<br />
<br />
== Funding ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=OctConf_2017&diff=9765OctConf 20172017-01-31T12:14:49Z<p>Francesco Faccio: /* Participants */</p>
<hr />
<div>OctConf 2017 will take place at CERN, Geneva, Switzerland for three days from March 20 until March 22. Please email [mailto: XXX] or [mailto: YYY] if you think you could attend. Also write your name below in the Participants section if you think of attending with high probability.<br />
<br />
{|align="right"<br />
|[[File:Gnu-octave-logo.png|x120px]]<br />
|[[File:Octconf2015Logo.png|x120px]]<br />
|}<br />
<br />
== Slides ==<br />
<br />
== Fund Raising ==<br />
<br />
== Location ==<br />
[[File:|300px|thumb|left|alt=|Mathildenhöhe in Darmstadt]] <br />
=== Geneva, Switzerland ===<br />
=== Venue ===<br />
The upcoming Octconf 2017 will take place at <br />
<br />
=== Travelling ===<br />
<br />
== Dates ==<br />
<br />
== Suggestions for Sessions ==<br />
Code sprints and informal discussion will happen every day. Please propose topics of interest for these sessions.<br />
<br />
=== Schedule ===<br />
<br />
<table class="tg" border="1" width="800" style="text-align: center"><br />
<tr><br />
<th width="110">Time</th><br />
<th width="230">Monday<br/>(Octave Core Day)</th><br />
<th width="230">Tuesday<br/>(Packages Day)</th><br />
<th width="230">Wednesday<br/>(Open Source Day)</th><br />
</tr><br />
<tr><br />
<td><br/><br/>9:00-10:00<br/><br/><br/></td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>10:00-10:15</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td>10:15-10:50</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>10:50-11:25</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>11:25-12:00</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>12:00-12:30</td><br />
<td><strong>Discussion</strong></td><br />
<td><strong>Discussion</strong></td><br />
</tr><br />
<tr><br />
<td><br/>12:30-14:00<br/><br/></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
<td><strong>Lunch</strong></td><br />
</tr><br />
<tr><br />
<td>14:00-14:35</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>14:35-15:10</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>15:10-15:45</td><br />
</tr><br />
<tr><br />
<td>15:45-16:00</td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
<td><strong>Coffee</strong></td><br />
</tr><br />
<tr><br />
<td><br/><br/>16:00-18:00<br/><br/><br/></td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>18:00-19:00</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
<tr><br />
<td>19:00-20:00</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
<td><br/>()</td><br />
</tr><br />
</table><br />
<br />
=== Poster Session ===<br />
Show us what you do with Octave and any interesting application in your field.<br />
Please email [mailto: us] if you are interested in contributing so that we can schedule the number of participants.<br />
<br />
Confirmed Posters:<br />
<br />
<table class="tg" border="0" width="600" style="text-align: left"><br />
<tr><br />
<th width="400">Title</th><br />
<th width="200">Author</th><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr> <br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<tr><br />
<td></td><br />
<td></td><br />
</tr><br />
<br />
</table><br />
<br />
== Participants ==<br />
* [http://graduate-school-ce.de/schoeps Sebastian Schöps]<br />
* [[User:KaKiLa|Juan Pablo Carbajal]]<br />
* [http://www1.mate.polimi.it/~carlo/ Carlo de Falco]<br />
* [[User:Francesco Faccio|Francesco Faccio]]<br />
<br />
== Child Care ==<br />
<br />
== Funding ==<br />
<br />
== Questionnaires results ==<br />
<br />
== Previous OctConf ==<br />
[[OctConf 2015]]<br />
<br />
== Next OctConf ==<br />
[[OctConf 2018]]<br />
<br />
[[Category:OctConf]]<br />
[[Category:2017]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=User:Francesco_Faccio&diff=9033User:Francesco Faccio2016-03-25T18:18:36Z<p>Francesco Faccio: /* Y: Your task */</p>
<hr />
<div>= Public application template =<br />
<br />
== A: An introduction ==<br />
* Please describe yourself in three sentences, one of them regarding your current studies.<br />
My name is Francesco Faccio, I’m a Master’s student in Mathematical Engineering at Politecnico of Milan. I speak Italian and English. My background includes Applied Mathematics, Computer Science and Applied Statistics.<br />
<br />
* Why do you want to participate in the Google Summer of Code? What do you hope to gain by doing so?<br />
I would like to participate in the GSoC firstly because I think this is a great opportunity for me to further my skills and gain experience working on a real problem. Secondly, the possibility to help a community growing motivates me to accomplish my goals. This is the first time I participate at the GSoC.<br />
<br />
* Why are you choosing Octave?<br />
I’ve been familiar with Octave since when I’ve studied numerical analysis for the first time. I have chosen Octave because the projects proposed deal with two of my main interests: numerical methods and programming. Furthermore, the Octave community is very active and it’s very useful to interact with the maintainers.<br />
<br />
== C: Contact ==<br />
* Please state the (unique and identical where possible) nick you use on IRC and any other communication channel related to Octave.<br />
IRC nick: ff9<br />
Email: francesco.faccio@mail.polimi.it<br />
<br />
* Which time zone do you live in? Will that change over GSoC duration? <br />
My time zone is UTC+1 and it should not change during GSoC<br />
<br />
* Please state the timeframe (in UTC+0) when you feel most comfortable working during GSoC. Where are your time buffers? <br />
I can work around 07:00-09:00, 12:00-18:00, but I’m flexible. I could code also around 19.30-23.30 for few days.<br />
<br />
== E: Coding experience ==<br />
This part is one of the more important ones in your application. You are allowed to be as verbose as you want, as long as you stay on topic ;-)<br />
* Please describe your experience with C++, Octave or Matlab m-scripts, OpenGL and Qt.<br />
I have a great experience working with C++11. I have learnt C before C++, working on projects.<br />
<br />
I have used Matlab and Octave in my courses of Numerical Mathematics, Numerical Analysis for PDE and OR. I’ve studied and implemented the most common methods for solving linear systems (LU, Chol, QR, Thomas, Jacobi, Gauss-Seidel, Richardson,Conjugate Gradient, Krylov methods), approximating eigenvalues, eigenvectors, roots, interpolation and integration, solving differential equations (Theta method, Runge-Kutta, Adams-Bashforth), solving PDE with finite difference methods (Theta method, Upwind, Lax-Friedrichs, Lax-Wendroff ) and finite element methods (Galerkin).<br />
<br />
I’ve worked on a project related to a scheduling problem in a four people team using Matlab:<br />
https://www.kaggle.com/c/helping-santas-helpers<br />
<br />
* Please describe your experience with other programming languages.<br />
I have attended courses on Python and FORTRAN but I don’t have a good experience.<br />
I have done some projects with Mathematica and R.<br />
<br />
* Please describe your experience with being in a development team. <br />
I am new to open source community.<br />
<br />
* Please describe the biggest project you have written code for and what you learned by doing so. Also describe your role in that project over time.<br />
The biggest project I’ve made (in a two people team) has been the implementation of the Biham-Middleton-Levine traffic model in c++ (a 10ECTS class project). In the first part of the project we’ve learnt how to handle big data matrices, then we’ve written all the classes and methods we needed. The main goal of the project was to implement the most efficient algorithm, so we’ve started to consider dense/sparse matrices and hybrid cases. In the last part of the project we’ve written an OpenMP and MPI version of the code. <br />
<br />
Through this project I’ve improved my programming skills, I’ve learnt how to use CMake, Git, Bash. <br />
<br />
* Please state the commits and patches you already contributed to Octave. <br />
I will start giving my contribution to the community very soon.<br />
<br />
== F: Feeling fine ==<br />
* Please describe (in short) your experience with the following tools: <br />
** IRC and mailing lists<br />
I use IRC channel and the mailing list to contact my mentors and to ask informations. <br />
<br />
** Mercurial or other source code management systems<br />
I’ve read the documentation of Mercurial and I’ve started to use it. I’m familiar with Git.<br />
<br />
** Mediawiki or other wiki software<br />
I’ve just started to use my account and to explore<br />
<br />
** make, gcc, gdb or other development tools<br />
I’m familiar with make and gcc<br />
<br />
* What will make you actively stay in our community after this GSoC is over?<br />
I would like to give my contribution to the community after the GSoC. I think I could develope some statistical tools (I’m studying Applied Statistics, AI and Machine Learning).<br />
<br />
== O: Only out of interest ==<br />
* Did you ever hear about Octave before? <br />
I’ve used Octave during my courses on Numerical Analysis two years ago at Politecnico of Milan.<br />
<br />
* What was the first question concerning Octave you could not find an answer to rather quickly?<br />
“How can I build the development sources?” The problem was due to some setting of my<br />
pc.<br />
<br />
== P: Prerequisites ==<br />
* Please state the operating system you work with.<br />
Ubuntu 15.04, Windows 10<br />
<br />
* Please estimate an average time per day you will be able to access an internet connection, a computer, a computer with your progressing work on.<br />
I will be able to access it for all day.<br />
<br />
* Please describe the degree to which you can install new software on computers you have access to.<br />
I can install any software.<br />
<br />
== S: Self-assessment ==<br />
* Please describe how useful criticism looks from your point of view as committing student.<br />
I think constructive criticism is the most useful way to improve. I like being criticized because I know that someone takes care of what I’m doing, but sometimes I need also to receive compliments if I deserve them. <br />
<br />
* How autonomous are you when developing: Do you like to discuss changes intensively and not start coding until you know what you want to do? Do you like to code a proof of concept to 'see how it turns out', modifying that and taking the risk of having work thrown away if it doesn't match what the project or original proponent had in mind?<br />
I like to discuss what I want to do before doing it and to receive more feedback. This can only improve the quality of my work. In my experience I’ve also worked autonomously, so I think I can adapt myself to any situation.<br />
<br />
== Y: Your task ==<br />
* Did you select a task from our list of proposals and ideas? If yes, what task did you choose? Please describe what part of it you especially want to focus on if you can already provide this information. <br />
Yes, I would like to work on the project “ode15s : Matlab Compatible DAE solver”<br />
http://wiki.octave.org/Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver<br />
<br />
* Please provide a rough estimated timeline for your work on the task. <br />
During the GSoC I plan to work 40 hours a week. This is the Timeline I want to follow:<br />
(the schedule will be better defined every week till the end of GSoC):<br />
<br />
Before 22nd April:<br />
-familiarize with the community (using mailing list, IRC Channel, giving my contribution to short projects)<br />
-familiarize with Mercurial and autotools<br />
-study of SUNDIALS library, Oct and MEX files<br />
<br />
22nd April - 22nd May:<br />
-study of the existing documentation of ode15s<br />
-comparison between ode15s and the other ODE solvers <br />
-study of numerical methods for DAEs<br />
-Keep in touch with the community and the mentor better defining all the steps we need to reach our goals<br />
<br />
Work period<br />
<br />
23rd May-20th June<br />
-Write unit tests<br />
-Interface definition<br />
-Methods, events definition<br />
-Test classes<br />
<br />
<br />
Mid-term evaluation<br />
<br />
21st June - 7th August<br />
-Add external dependencies (if there will be unexpected problems with SUNDIALS, other libraries like DASPK, DASSL or Rythmos will be considered)<br />
-Test classes (with dependencies)<br />
-Test the compatibility between Matlab and Octave<br />
-Validation test<br />
<br />
8th August - 23rd August<br />
-Write the documentation and make more tests<br />
<br />
[[Category: Summer of Code]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=User:Francesco_Faccio&diff=9032User:Francesco Faccio2016-03-25T18:17:06Z<p>Francesco Faccio: /* O: Only out of interest */</p>
<hr />
<div>= Public application template =<br />
<br />
== A: An introduction ==<br />
* Please describe yourself in three sentences, one of them regarding your current studies.<br />
My name is Francesco Faccio, I’m a Master’s student in Mathematical Engineering at Politecnico of Milan. I speak Italian and English. My background includes Applied Mathematics, Computer Science and Applied Statistics.<br />
<br />
* Why do you want to participate in the Google Summer of Code? What do you hope to gain by doing so?<br />
I would like to participate in the GSoC firstly because I think this is a great opportunity for me to further my skills and gain experience working on a real problem. Secondly, the possibility to help a community growing motivates me to accomplish my goals. This is the first time I participate at the GSoC.<br />
<br />
* Why are you choosing Octave?<br />
I’ve been familiar with Octave since when I’ve studied numerical analysis for the first time. I have chosen Octave because the projects proposed deal with two of my main interests: numerical methods and programming. Furthermore, the Octave community is very active and it’s very useful to interact with the maintainers.<br />
<br />
== C: Contact ==<br />
* Please state the (unique and identical where possible) nick you use on IRC and any other communication channel related to Octave.<br />
IRC nick: ff9<br />
Email: francesco.faccio@mail.polimi.it<br />
<br />
* Which time zone do you live in? Will that change over GSoC duration? <br />
My time zone is UTC+1 and it should not change during GSoC<br />
<br />
* Please state the timeframe (in UTC+0) when you feel most comfortable working during GSoC. Where are your time buffers? <br />
I can work around 07:00-09:00, 12:00-18:00, but I’m flexible. I could code also around 19.30-23.30 for few days.<br />
<br />
== E: Coding experience ==<br />
This part is one of the more important ones in your application. You are allowed to be as verbose as you want, as long as you stay on topic ;-)<br />
* Please describe your experience with C++, Octave or Matlab m-scripts, OpenGL and Qt.<br />
I have a great experience working with C++11. I have learnt C before C++, working on projects.<br />
<br />
I have used Matlab and Octave in my courses of Numerical Mathematics, Numerical Analysis for PDE and OR. I’ve studied and implemented the most common methods for solving linear systems (LU, Chol, QR, Thomas, Jacobi, Gauss-Seidel, Richardson,Conjugate Gradient, Krylov methods), approximating eigenvalues, eigenvectors, roots, interpolation and integration, solving differential equations (Theta method, Runge-Kutta, Adams-Bashforth), solving PDE with finite difference methods (Theta method, Upwind, Lax-Friedrichs, Lax-Wendroff ) and finite element methods (Galerkin).<br />
<br />
I’ve worked on a project related to a scheduling problem in a four people team using Matlab:<br />
https://www.kaggle.com/c/helping-santas-helpers<br />
<br />
* Please describe your experience with other programming languages.<br />
I have attended courses on Python and FORTRAN but I don’t have a good experience.<br />
I have done some projects with Mathematica and R.<br />
<br />
* Please describe your experience with being in a development team. <br />
I am new to open source community.<br />
<br />
* Please describe the biggest project you have written code for and what you learned by doing so. Also describe your role in that project over time.<br />
The biggest project I’ve made (in a two people team) has been the implementation of the Biham-Middleton-Levine traffic model in c++ (a 10ECTS class project). In the first part of the project we’ve learnt how to handle big data matrices, then we’ve written all the classes and methods we needed. The main goal of the project was to implement the most efficient algorithm, so we’ve started to consider dense/sparse matrices and hybrid cases. In the last part of the project we’ve written an OpenMP and MPI version of the code. <br />
<br />
Through this project I’ve improved my programming skills, I’ve learnt how to use CMake, Git, Bash. <br />
<br />
* Please state the commits and patches you already contributed to Octave. <br />
I will start giving my contribution to the community very soon.<br />
<br />
== F: Feeling fine ==<br />
* Please describe (in short) your experience with the following tools: <br />
** IRC and mailing lists<br />
I use IRC channel and the mailing list to contact my mentors and to ask informations. <br />
<br />
** Mercurial or other source code management systems<br />
I’ve read the documentation of Mercurial and I’ve started to use it. I’m familiar with Git.<br />
<br />
** Mediawiki or other wiki software<br />
I’ve just started to use my account and to explore<br />
<br />
** make, gcc, gdb or other development tools<br />
I’m familiar with make and gcc<br />
<br />
* What will make you actively stay in our community after this GSoC is over?<br />
I would like to give my contribution to the community after the GSoC. I think I could develope some statistical tools (I’m studying Applied Statistics, AI and Machine Learning).<br />
<br />
== O: Only out of interest ==<br />
* Did you ever hear about Octave before? <br />
I’ve used Octave during my courses on Numerical Analysis two years ago at Politecnico of Milan.<br />
<br />
* What was the first question concerning Octave you could not find an answer to rather quickly?<br />
“How can I build the development sources?” The problem was due to some setting of my<br />
pc.<br />
<br />
== P: Prerequisites ==<br />
* Please state the operating system you work with.<br />
Ubuntu 15.04, Windows 10<br />
<br />
* Please estimate an average time per day you will be able to access an internet connection, a computer, a computer with your progressing work on.<br />
I will be able to access it for all day.<br />
<br />
* Please describe the degree to which you can install new software on computers you have access to.<br />
I can install any software.<br />
<br />
== S: Self-assessment ==<br />
* Please describe how useful criticism looks from your point of view as committing student.<br />
I think constructive criticism is the most useful way to improve. I like being criticized because I know that someone takes care of what I’m doing, but sometimes I need also to receive compliments if I deserve them. <br />
<br />
* How autonomous are you when developing: Do you like to discuss changes intensively and not start coding until you know what you want to do? Do you like to code a proof of concept to 'see how it turns out', modifying that and taking the risk of having work thrown away if it doesn't match what the project or original proponent had in mind?<br />
I like to discuss what I want to do before doing it and to receive more feedback. This can only improve the quality of my work. In my experience I’ve also worked autonomously, so I think I can adapt myself to any situation.<br />
<br />
== Y: Your task ==<br />
* Did you select a task from our list of proposals and ideas? If yes, what task did you choose? Please describe what part of it you especially want to focus on if you can already provide this information. <br />
Yes, I would like to work on the project “ode15s : Matlab Compatible DAE solver”<br />
http://wiki.octave.org/Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver<br />
<br />
* Please provide a rough estimated timeline for your work on the task. <br />
During the GSoC I plan to work 40 hours a week. This is the Timeline I want to follow:<br />
<br />
Before 22nd April:<br />
-familiarize with the community (using mailing list, IRC Channel, giving my contribution to short projects)<br />
-familiarize with Mercurial and autotools<br />
-study of SUNDIALS library, Oct and MEX files<br />
<br />
22nd April - 22nd May:<br />
-study of the existing documentation of ode15s<br />
-comparison between ode15s and the other ODE solvers <br />
-study of numerical methods for DAEs<br />
-Keep in touch with the community and the mentor better defining all the steps we need to reach our goals<br />
<br />
Work period<br />
<br />
23rd May-20th June<br />
-Write unit tests<br />
-Interface definition<br />
-Methods, events definition<br />
-Test classes<br />
<br />
<br />
Mid-term evaluation<br />
<br />
21st June - 7th August<br />
-Add external dependencies (if there will be unexpected problems with SUNDIALS, other libraries like DASPK, DASSL or Rythmos will be considered)<br />
-Test classes (with dependencies)<br />
-Test the compatibility between Matlab and Octave<br />
-Validation test<br />
<br />
8th August - 23rd August<br />
-Write the documentation and make more tests<br />
<br />
[[Category: Summer of Code]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=User:Francesco_Faccio&diff=9028User:Francesco Faccio2016-03-25T17:48:07Z<p>Francesco Faccio: /* A: An introduction */</p>
<hr />
<div>= Public application template =<br />
<br />
== A: An introduction ==<br />
* Please describe yourself in three sentences, one of them regarding your current studies.<br />
My name is Francesco Faccio, I’m a Master’s student in Mathematical Engineering at Politecnico of Milan. I speak Italian and English. My background includes Applied Mathematics, Computer Science and Applied Statistics.<br />
<br />
* Why do you want to participate in the Google Summer of Code? What do you hope to gain by doing so?<br />
I would like to participate in the GSoC firstly because I think this is a great opportunity for me to further my skills and gain experience working on a real problem. Secondly, the possibility to help a community growing motivates me to accomplish my goals. This is the first time I participate at the GSoC.<br />
<br />
* Why are you choosing Octave?<br />
I’ve been familiar with Octave since when I’ve studied numerical analysis for the first time. I have chosen Octave because the projects proposed deal with two of my main interests: numerical methods and programming. Furthermore, the Octave community is very active and it’s very useful to interact with the maintainers.<br />
<br />
== C: Contact ==<br />
* Please state the (unique and identical where possible) nick you use on IRC and any other communication channel related to Octave.<br />
IRC nick: ff9<br />
Email: francesco.faccio@mail.polimi.it<br />
<br />
* Which time zone do you live in? Will that change over GSoC duration? <br />
My time zone is UTC+1 and it should not change during GSoC<br />
<br />
* Please state the timeframe (in UTC+0) when you feel most comfortable working during GSoC. Where are your time buffers? <br />
I can work around 07:00-09:00, 12:00-18:00, but I’m flexible. I could code also around 19.30-23.30 for few days.<br />
<br />
== E: Coding experience ==<br />
This part is one of the more important ones in your application. You are allowed to be as verbose as you want, as long as you stay on topic ;-)<br />
* Please describe your experience with C++, Octave or Matlab m-scripts, OpenGL and Qt.<br />
I have a great experience working with C++11. I have learnt C before C++, working on projects.<br />
<br />
I have used Matlab and Octave in my courses of Numerical Mathematics, Numerical Analysis for PDE and OR. I’ve studied and implemented the most common methods for solving linear systems (LU, Chol, QR, Thomas, Jacobi, Gauss-Seidel, Richardson,Conjugate Gradient, Krylov methods), approximating eigenvalues, eigenvectors, roots, interpolation and integration, solving differential equations (Theta method, Runge-Kutta, Adams-Bashforth), solving PDE with finite difference methods (Theta method, Upwind, Lax-Friedrichs, Lax-Wendroff ) and finite element methods (Galerkin).<br />
<br />
I’ve worked on a project related to a scheduling problem in a four people team using Matlab:<br />
https://www.kaggle.com/c/helping-santas-helpers<br />
<br />
* Please describe your experience with other programming languages.<br />
I have attended courses on Python and FORTRAN but I don’t have a good experience.<br />
I have done some projects with Mathematica and R.<br />
<br />
* Please describe your experience with being in a development team. <br />
I am new to open source community.<br />
<br />
* Please describe the biggest project you have written code for and what you learned by doing so. Also describe your role in that project over time.<br />
The biggest project I’ve made (in a two people team) has been the implementation of the Biham-Middleton-Levine traffic model in c++ (a 10ECTS class project). In the first part of the project we’ve learnt how to handle big data matrices, then we’ve written all the classes and methods we needed. The main goal of the project was to implement the most efficient algorithm, so we’ve started to consider dense/sparse matrices and hybrid cases. In the last part of the project we’ve written an OpenMP and MPI version of the code. <br />
<br />
Through this project I’ve improved my programming skills, I’ve learnt how to use CMake, Git, Bash. <br />
<br />
* Please state the commits and patches you already contributed to Octave. <br />
I will start giving my contribution to the community very soon.<br />
<br />
== F: Feeling fine ==<br />
* Please describe (in short) your experience with the following tools: <br />
** IRC and mailing lists<br />
I use IRC channel and the mailing list to contact my mentors and to ask informations. <br />
<br />
** Mercurial or other source code management systems<br />
I’ve read the documentation of Mercurial and I’ve started to use it. I’m familiar with Git.<br />
<br />
** Mediawiki or other wiki software<br />
I’ve just started to use my account and to explore<br />
<br />
** make, gcc, gdb or other development tools<br />
I’m familiar with make and gcc<br />
<br />
* What will make you actively stay in our community after this GSoC is over?<br />
I would like to give my contribution to the community after the GSoC. I think I could develope some statistical tools (I’m studying Applied Statistics, AI and Machine Learning).<br />
<br />
== O: Only out of interest ==<br />
* Did you ever hear about Octave before? <br />
I’ve used Octave during my courses on Numerical Analysis two years ago at Politecnico of Milan.<br />
<br />
* What was the first question concerning Octave you could not find an answer to rather quickly? <br />
<br />
== P: Prerequisites ==<br />
* Please state the operating system you work with.<br />
Ubuntu 15.04, Windows 10<br />
<br />
* Please estimate an average time per day you will be able to access an internet connection, a computer, a computer with your progressing work on.<br />
I will be able to access it for all day.<br />
<br />
* Please describe the degree to which you can install new software on computers you have access to.<br />
I can install any software.<br />
<br />
== S: Self-assessment ==<br />
* Please describe how useful criticism looks from your point of view as committing student.<br />
I think constructive criticism is the most useful way to improve. I like being criticized because I know that someone takes care of what I’m doing, but sometimes I need also to receive compliments if I deserve them. <br />
<br />
* How autonomous are you when developing: Do you like to discuss changes intensively and not start coding until you know what you want to do? Do you like to code a proof of concept to 'see how it turns out', modifying that and taking the risk of having work thrown away if it doesn't match what the project or original proponent had in mind?<br />
I like to discuss what I want to do before doing it and to receive more feedback. This can only improve the quality of my work. In my experience I’ve also worked autonomously, so I think I can adapt myself to any situation.<br />
<br />
== Y: Your task ==<br />
* Did you select a task from our list of proposals and ideas? If yes, what task did you choose? Please describe what part of it you especially want to focus on if you can already provide this information. <br />
Yes, I would like to work on the project “ode15s : Matlab Compatible DAE solver”<br />
http://wiki.octave.org/Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver<br />
<br />
* Please provide a rough estimated timeline for your work on the task. <br />
During the GSoC I plan to work 40 hours a week. This is the Timeline I want to follow:<br />
<br />
Before 22nd April:<br />
-familiarize with the community (using mailing list, IRC Channel, giving my contribution to short projects)<br />
-familiarize with Mercurial and autotools<br />
-study of SUNDIALS library, Oct and MEX files<br />
<br />
22nd April - 22nd May:<br />
-study of the existing documentation of ode15s<br />
-comparison between ode15s and the other ODE solvers <br />
-study of numerical methods for DAEs<br />
-Keep in touch with the community and the mentor better defining all the steps we need to reach our goals<br />
<br />
Work period<br />
<br />
23rd May-20th June<br />
-Write unit tests<br />
-Interface definition<br />
-Methods, events definition<br />
-Test classes<br />
<br />
<br />
Mid-term evaluation<br />
<br />
21st June - 7th August<br />
-Add external dependencies (if there will be unexpected problems with SUNDIALS, other libraries like DASPK, DASSL or Rythmos will be considered)<br />
-Test classes (with dependencies)<br />
-Test the compatibility between Matlab and Octave<br />
-Validation test<br />
<br />
8th August - 23rd August<br />
-Write the documentation and make more tests<br />
<br />
[[Category: Summer of Code]]</div>Francesco Facciohttps://wiki.octave.org/wiki/index.php?title=User:Francesco_Faccio&diff=9027User:Francesco Faccio2016-03-25T17:05:16Z<p>Francesco Faccio: Created page with "= Public application template = == A: An introduction == * Please describe yourself in three sentences, one of them regarding your current studies. My name is Francesco Facci..."</p>
<hr />
<div>= Public application template =<br />
<br />
== A: An introduction ==<br />
* Please describe yourself in three sentences, one of them regarding your current studies.<br />
My name is Francesco Faccio, I’m a Master’s student in Mathematical Engineering at Politecnico of Milan. I speak Italian and English. My backgroung includes Applied Mathematics, Computer Science and Applied Statistics.<br />
<br />
* Why do you want to participate in the Google Summer of Code? What do you hope to gain by doing so?<br />
I would like to participate in the GSoC firstly because I think this is a great opportunity for me to further my skills and gain experience working on a real problem. Secondly, the possibility to help a community growing motivates me to accomplish my goals. This is the first time I participate at the GSoC.<br />
<br />
* Why are you choosing Octave?<br />
I’ve been familiar with Octave since when I’ve studied numerical analysis for the first time. I have chosen Octave because the projects proposed deal with two of my main interests: numerical methods and programming. Furthermore, the Octave community is very active and it’s very useful to interact with the maintainers. <br />
<br />
== C: Contact ==<br />
* Please state the (unique and identical where possible) nick you use on IRC and any other communication channel related to Octave.<br />
IRC nick: ff9<br />
Email: francesco.faccio@mail.polimi.it<br />
<br />
* Which time zone do you live in? Will that change over GSoC duration? <br />
My time zone is UTC+1 and it should not change during GSoC<br />
<br />
* Please state the timeframe (in UTC+0) when you feel most comfortable working during GSoC. Where are your time buffers? <br />
I can work around 07:00-09:00, 12:00-18:00, but I’m flexible. I could code also around 19.30-23.30 for few days.<br />
<br />
== E: Coding experience ==<br />
This part is one of the more important ones in your application. You are allowed to be as verbose as you want, as long as you stay on topic ;-)<br />
* Please describe your experience with C++, Octave or Matlab m-scripts, OpenGL and Qt.<br />
I have a great experience working with C++11. I have learnt C before C++, working on projects.<br />
<br />
I have used Matlab and Octave in my courses of Numerical Mathematics, Numerical Analysis for PDE and OR. I’ve studied and implemented the most common methods for solving linear systems (LU, Chol, QR, Thomas, Jacobi, Gauss-Seidel, Richardson,Conjugate Gradient, Krylov methods), approximating eigenvalues, eigenvectors, roots, interpolation and integration, solving differential equations (Theta method, Runge-Kutta, Adams-Bashforth), solving PDE with finite difference methods (Theta method, Upwind, Lax-Friedrichs, Lax-Wendroff ) and finite element methods (Galerkin).<br />
<br />
I’ve worked on a project related to a scheduling problem in a four people team using Matlab:<br />
https://www.kaggle.com/c/helping-santas-helpers<br />
<br />
* Please describe your experience with other programming languages.<br />
I have attended courses on Python and FORTRAN but I don’t have a good experience.<br />
I have done some projects with Mathematica and R.<br />
<br />
* Please describe your experience with being in a development team. <br />
I am new to open source community.<br />
<br />
* Please describe the biggest project you have written code for and what you learned by doing so. Also describe your role in that project over time.<br />
The biggest project I’ve made (in a two people team) has been the implementation of the Biham-Middleton-Levine traffic model in c++ (a 10ECTS class project). In the first part of the project we’ve learnt how to handle big data matrices, then we’ve written all the classes and methods we needed. The main goal of the project was to implement the most efficient algorithm, so we’ve started to consider dense/sparse matrices and hybrid cases. In the last part of the project we’ve written an OpenMP and MPI version of the code. <br />
<br />
Through this project I’ve improved my programming skills, I’ve learnt how to use CMake, Git, Bash. <br />
<br />
* Please state the commits and patches you already contributed to Octave. <br />
I will start giving my contribution to the community very soon.<br />
<br />
== F: Feeling fine ==<br />
* Please describe (in short) your experience with the following tools: <br />
** IRC and mailing lists<br />
I use IRC channel and the mailing list to contact my mentors and to ask informations. <br />
<br />
** Mercurial or other source code management systems<br />
I’ve read the documentation of Mercurial and I’ve started to use it. I’m familiar with Git.<br />
<br />
** Mediawiki or other wiki software<br />
I’ve just started to use my account and to explore<br />
<br />
** make, gcc, gdb or other development tools<br />
I’m familiar with make and gcc<br />
<br />
* What will make you actively stay in our community after this GSoC is over?<br />
I would like to give my contribution to the community after the GSoC. I think I could develope some statistical tools (I’m studying Applied Statistics, AI and Machine Learning).<br />
<br />
== O: Only out of interest ==<br />
* Did you ever hear about Octave before? <br />
I’ve used Octave during my courses on Numerical Analysis two years ago at Politecnico of Milan.<br />
<br />
* What was the first question concerning Octave you could not find an answer to rather quickly? <br />
<br />
== P: Prerequisites ==<br />
* Please state the operating system you work with.<br />
Ubuntu 15.04, Windows 10<br />
<br />
* Please estimate an average time per day you will be able to access an internet connection, a computer, a computer with your progressing work on.<br />
I will be able to access it for all day.<br />
<br />
* Please describe the degree to which you can install new software on computers you have access to.<br />
I can install any software.<br />
<br />
== S: Self-assessment ==<br />
* Please describe how useful criticism looks from your point of view as committing student.<br />
I think constructive criticism is the most useful way to improve. I like being criticized because I know that someone takes care of what I’m doing, but sometimes I need also to receive compliments if I deserve them. <br />
<br />
* How autonomous are you when developing: Do you like to discuss changes intensively and not start coding until you know what you want to do? Do you like to code a proof of concept to 'see how it turns out', modifying that and taking the risk of having work thrown away if it doesn't match what the project or original proponent had in mind?<br />
I like to discuss what I want to do before doing it and to receive more feedback. This can only improve the quality of my work. In my experience I’ve also worked autonomously, so I think I can adapt myself to any situation.<br />
<br />
== Y: Your task ==<br />
* Did you select a task from our list of proposals and ideas? If yes, what task did you choose? Please describe what part of it you especially want to focus on if you can already provide this information. <br />
Yes, I would like to work on the project “ode15s : Matlab Compatible DAE solver”<br />
http://wiki.octave.org/Summer_of_Code_Project_Ideas#ode15s_:_Matlab_Compatible_DAE_solver<br />
<br />
* Please provide a rough estimated timeline for your work on the task. <br />
During the GSoC I plan to work 40 hours a week. This is the Timeline I want to follow:<br />
<br />
Before 22nd April:<br />
-familiarize with the community (using mailing list, IRC Channel, giving my contribution to short projects)<br />
-familiarize with Mercurial and autotools<br />
-study of SUNDIALS library, Oct and MEX files<br />
<br />
22nd April - 22nd May:<br />
-study of the existing documentation of ode15s<br />
-comparison between ode15s and the other ODE solvers <br />
-study of numerical methods for DAEs<br />
-Keep in touch with the community and the mentor better defining all the steps we need to reach our goals<br />
<br />
Work period<br />
<br />
23rd May-20th June<br />
-Write unit tests<br />
-Interface definition<br />
-Methods, events definition<br />
-Test classes<br />
<br />
<br />
Mid-term evaluation<br />
<br />
21st June - 7th August<br />
-Add external dependencies (if there will be unexpected problems with SUNDIALS, other libraries like DASPK, DASSL or Rythmos will be considered)<br />
-Test classes (with dependencies)<br />
-Test the compatibility between Matlab and Octave<br />
-Validation test<br />
<br />
8th August - 23rd August<br />
-Write the documentation and make more tests<br />
<br />
[[Category: Summer of Code]]</div>Francesco Faccio