Online Developer Meeting (2021-03-23): Difference between revisions

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(→‎See also: Announce next meeting.)
 
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* Unify widget for all OSes
* Unify widget for all OSes
* Make jwe's patch a configurable options for testing (nothing to use productively yet)
* Make jwe's patch a configurable options for testing (nothing to use productively yet)
* Need to implement own pager (scroll bar)
* Need to implement own pager (alternatively: scroll bar only)
* Better responsibility delegation between GUI and interpreter
* Better responsibility delegation between GUI and interpreter
** Big matrix output: interpreter asks GUI to print big matrix, GUI can confirm with user, etc.
** Big matrix output: interpreter could ask GUI to print big matrix, GUI could confirm with user, etc.
** Formatting (colors, URLs, etc.) can be done by the GUI.  Interpreter does not know about window-width, etc.
** Formatting (colors, URLs, etc.) could be done by the GUI.  Interpreter does not need to know about window-width, etc.


===== User invisible code improvements =====
===== Backend code improvements =====


* "Ditch" old UNIX system functions (e.g. popen)
* "Ditch" old UNIX system functions (e.g. popen)
** Move to package?
** Move to package?
* import-operator
** compose a list of functions that are candidates for removal from core Octave. See: [https://octave.discourse.group/t/moving-posix-system-call-and-library-functions-out-of-core-octave/1027 Moving POSIX system call and library functions out of core Octave]
** use <code>std::unordered_map</code>, rather than <code>std::map</code> to increase interpreter lookups
* performance of symbol lookup
** symbol resolution slow
** use <code>std::unordered_map</code>, rather than <code>std::map</code> to increase performance (e.g. of interpreter lookups)
* use <code>std::shared_ptr</code> instead of custom reference counting
** Potentially implement "import" keyword? That would probably slow down symbol lookup some more.
* favor C++ std-library functions over gnulib!
* Replace custom reference counters with implementation using <code>std::shared_ptr</code>
** Some instances are more difficult to replace. jwe will post something about this on the discourse forum.
* favor C++ std-library functions over gnulib where possible
** Maybe require C++14 or C++17? See: [https://octave.discourse.group/t/using-c-17-features/1026 Using C++17 features]
* improve HDF5 integration
* improve HDF5 integration
** Key to support latest Matlab file formats.
** Add "wrapper" for libhdf5 functions in Octave's scripting language.
** Key to support latest Matlab file formats. Try to implement in the interfaces for that format in .m file functions.
** Some developers very interested in this!
** Some developers very interested in this!


Line 86: Line 90:


* Automatically reschedule the meeting monthly (Kai suggests on Discourse)
* Automatically reschedule the meeting monthly (Kai suggests on Discourse)
* MXE Octave branches and buildbots
* Strategy for transition to string class syntax (incompatible to current double-quoted character vectors in Octave)?
* Allow using more modern C++ dialects (C++17 STL std::filesystem or boost::filesystem)?


== See also ==
== See also ==


* Next meeting: TBA
* Next meeting: [[Online Developer Meeting (2021-04-27)]]
* Last meeting: [[Online Developer Meeting (2020-11-10)]]
* Last meeting: [[Online Developer Meeting (2020-11-10)]]


[[Category:2021]]
[[Category:2021]]
[[Category:Meetings]]
[[Category:Meetings]]

Latest revision as of 02:54, 22 April 2021

Todays topics[edit]

  • Meet and greet 5 minutes before meeting (audio testing).

Octave 7[edit]

Previous idea collections for Octave 7[edit]

How to make Octave 7 visibly special?[edit]

  • Implement Matlabs new String-class
    • Difficult, but highly demanded.
  • Builtin hash-operator
    • Distinct feature from Matlab
Improve graphics[edit]
  • Use "new" OpenGL code path
    • Nice overview by User:Hg200
    • Likely to make plotting faster (more efficient methods to move data to graphics card)
    • Does not solve "double precision" problem, scaling must happen on Octave side even with new OpenGL code path
  • Consult professional OpenGL developer to review code
    • General agreement to spend Octave project money on this
Implement Matlabs new input validation[edit]
  • jwe can create dummy tree-elements
    • Problem if values are evaluated, the "right" action must be done
  • Can those validation statements come at arbitrary positions or only at the beginning of the file?
Command Window Widget[edit]
  • GUI terminal widget, https://octave.discourse.group/t/new-command-window-widget/501 (jwe's patch!)
  • Of special interest for MS Windows users
  • Unify widget for all OSes
  • Make jwe's patch a configurable options for testing (nothing to use productively yet)
  • Need to implement own pager (alternatively: scroll bar only)
  • Better responsibility delegation between GUI and interpreter
    • Big matrix output: interpreter could ask GUI to print big matrix, GUI could confirm with user, etc.
    • Formatting (colors, URLs, etc.) could be done by the GUI. Interpreter does not need to know about window-width, etc.
Backend code improvements[edit]
  • "Ditch" old UNIX system functions (e.g. popen)
  • performance of symbol lookup
    • use std::unordered_map, rather than std::map to increase performance (e.g. of interpreter lookups)
    • Potentially implement "import" keyword? That would probably slow down symbol lookup some more.
  • Replace custom reference counters with implementation using std::shared_ptr
    • Some instances are more difficult to replace. jwe will post something about this on the discourse forum.
  • favor C++ std-library functions over gnulib where possible
  • improve HDF5 integration
    • Add "wrapper" for libhdf5 functions in Octave's scripting language.
    • Key to support latest Matlab file formats. Try to implement in the interfaces for that format in .m file functions.
    • Some developers very interested in this!

Testing Matlab code[edit]

  • jwe will a single Discourse thread to ask for tests in Matlab
    • Old Discourse threads many maintainers receive notifications.

Octave online service[edit]

Documentation[edit]

Ideas for next meeting[edit]

  • Automatically reschedule the meeting monthly (Kai suggests on Discourse)
  • MXE Octave branches and buildbots
  • Strategy for transition to string class syntax (incompatible to current double-quoted character vectors in Octave)?
  • Allow using more modern C++ dialects (C++17 STL std::filesystem or boost::filesystem)?

See also[edit]

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