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*Improve logm, and sqrtm (see this thread: http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html) | *Improve logm, and sqrtm (see this thread: http://octave.1599824.n4.nabble.com/matrix-functions-td3137935.html) | ||
*Use pairwise | *Use pairwise addition in sum() to mitigate against numerical errors without substantial performance penalty (https://en.wikipedia.org/wiki/Pairwise_summation). | ||
*Review implementing algorithm in this 2009 paper (https://epubs.siam.org/doi/pdf/10.1137/080738490) for xsum (sum with extra accuracy). The existing implementation uses a 2005 paper. | *Review implementing algorithm in this 2009 paper (https://epubs.siam.org/doi/pdf/10.1137/080738490) for xsum (sum with extra accuracy). The existing implementation uses a 2005 paper. | ||
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*Improve design of ODE, DAE, classes. | *Improve design of ODE, DAE, classes. | ||
*Make QR more memory efficient for large matrices when not all the columns of Q are required (apparently this is not handled by the lapack code yet). | |||
*Evaluate harmonics and cross-correlations of unevenly sampled and nonstationary time series, as in http://www.jstatsoft.org/v11/i02 (which has C code with interface to R). (This is now partly implemented in the [http://octave.sourceforge.net/lssa/index.html lssa] package.) | *Evaluate harmonics and cross-correlations of unevenly sampled and nonstationary time series, as in http://www.jstatsoft.org/v11/i02 (which has C code with interface to R). (This is now partly implemented in the [http://octave.sourceforge.net/lssa/index.html lssa] package.) | ||
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== Matlab-compatible ODE solvers in core-Octave == | == Matlab-compatible ODE solvers in core-Octave == | ||
* Improve handling of sparse Jacobians in IDE/DAE solvers | * Improve handling of sparse Jacobians in IDE/DAE solvers | ||
** Currently, in the IDA wrapper function __ode15__ an over conservative guess for the amount of memory to be allocated when assembling a sparse jacobian is used, essentially allocating enough space for a full jacobian then freeing the excess memory, an initial patch for fixing this has been posted on the tracker, for integrating this into Octave it must be generalized to support prior versions of SUNDIALS | ** Currently, in the IDA wrapper function __ode15__ an over conservative guess for the amount of memory to be allocated when assembling a sparse jacobian is used, essentially allocating enough space for a full jacobian then freeing the excess memory, an initial patch for fixing this has been posted on the tracker, for integrating this into Octave it must be generalized to support prior versions of SUNDIALS | ||
** Currently Jacobians passed by the user in Octave's sparse matrix format are copied into SUNDIALS own sparse matrix format. Newer versions of SUNDIALS (5.x or higher) support letting the user take care of the linear algebra data structures and methods thus removing the need for the copy. Taking advantage of this feature would improve the solver performance both in terms of memory footprint and speed. | ** Currently Jacobians passed by the user in Octave's sparse matrix format are copied into SUNDIALS own sparse matrix format. Newer versions of SUNDIALS (5.x or higher) support letting the user take care of the linear algebra data structures and methods thus removing the need for the copy. Taking advantage of this feature would improve the solver performance both in terms of memory footprint and speed. | ||
** | ** References | ||
***[https://savannah.gnu.org/bugs/?func=detailitem&item_id=55905 tracker post about memory allocation] | |||
***[https://computing.llnl.gov/projects/sundials/release-history SUNDIALS release history] | |||
* Implement Matlab compatible versions of "deval". | * Implement Matlab compatible versions of "deval". | ||
* Complete transition of ode23s into core Octave | |||
** [https://savannah.gnu.org/bugs/?57309 Bug tracker entry discussing ode23s] | |||
== High Precision Arithmetic Computation == | == High Precision Arithmetic Computation == | ||
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The architecture consists of an Octave class interface implementing "mp" (multi-precision) objects. Arithmetic operations are forwarded to MPL using MEX files. This is totally transparent to the end user, except when displaying numbers. This implementation needs to be ported and tested under Octave. | The architecture consists of an Octave class interface implementing "mp" (multi-precision) objects. Arithmetic operations are forwarded to MPL using MEX files. This is totally transparent to the end user, except when displaying numbers. This implementation needs to be ported and tested under Octave. | ||
=GUI/IDE= | =GUI/IDE= | ||
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**Evaluate a line of code and return the output as a string (it would be best if it could provide three strings: output, warnings and errors). | **Evaluate a line of code and return the output as a string (it would be best if it could provide three strings: output, warnings and errors). | ||
**Query defined variables, i.e. get a list of currently defined variables. Bonus points if it could tell you if anything had changed since the last time you checked the variables (could also be done with signals). | **Query defined variables, i.e. get a list of currently defined variables. Bonus points if it could tell you if anything had changed since the last time you checked the variables (could also be done with signals). | ||
* | * Create a better (G)UI for the {{manual|profile|profiler}}. This may be done with Qt, but not necessarily. | ||
== GUI Variable Editor and Property Inspector == | == GUI Variable Editor and Property Inspector == | ||
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**minres | **minres | ||
**symmlq | **symmlq | ||
== SPQR Interface == | == SPQR Interface == | ||
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* write {{codeline|xmlread}} and {{codeline|xmlwrite}}. This could be done using [http://xerces.apache.org/xerces-c/ Xerces C++ interface] which apparently is what [http://octave.1599824.n4.nabble.com/xml-in-octave-td4663034.html Matlab uses]. | * write {{codeline|xmlread}} and {{codeline|xmlwrite}}. This could be done using [http://xerces.apache.org/xerces-c/ Xerces C++ interface] which apparently is what [http://octave.1599824.n4.nabble.com/xml-in-octave-td4663034.html Matlab uses]. | ||
* Implement hdf5 for .mat files (see [http://octave.1599824.n4.nabble.com/Reading-Matlab-td4650158.html this thread]) | * Implement hdf5 for .mat files (see [http://octave.1599824.n4.nabble.com/Reading-Matlab-td4650158.html this thread]). | ||
=Interpreter= | =Interpreter= | ||
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* Implement a coverage tool for collecting coverage data and generating code coverage reports on m-file functions and scripts. This would be very useful for Octave development as well as for users who want a code coverage report for their own functions and scripts. | * Implement a coverage tool for collecting coverage data and generating code coverage reports on m-file functions and scripts. This would be very useful for Octave development as well as for users who want a code coverage report for their own functions and scripts. | ||
We are far from even having one test for every function, so focus should be on getting the breadth of coverage first before trying to get the depth of 100% statement coverage. As of Dec 2015, 202 of 1020 m-files have no tests. Some of these will be plotting functions which have demos instead, but that leaves enough functions to be an interesting project. As of Dec 2015, there are 485 instances of C++ functions which need tests. | We are far from even having one test for every function, so focus should be on getting the breadth of coverage first before trying to get the depth of 100% statement coverage. As of Dec 2015, 202 of 1020 m-files have no tests. Some of these will be plotting functions which have demos instead, but that leaves enough functions to be an interesting project. As of Dec 2015, there are 485 instances of C++ functions which need tests. | ||
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* Help prepare and deliver presentations and [[Publications about Octave]] at colleges and universities. | * Help prepare and deliver presentations and [[Publications about Octave]] at colleges and universities. | ||
* Create a [[Forum for GNU Octave]]. | |||
== Improve Windows binary packaging == | == Improve Windows binary packaging == | ||
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=Performance= | =Performance= | ||
* A profiler for Octave would be a very useful tool. And now we have one! But it really needs a better interface. | |||
* Having {{Codeline|parfor}} functioning would speed code development and execution now that multicore architectures are widespread. See [http://octave.1599824.n4.nabble.com/Parfor-td4630575.html here] and [http://stackoverflow.com/questions/24970519/how-to-use-parallel-for-loop-in-octave-or-scilab here]. Existing code from the [[Parallel package | parallel]] and [http://octave.sourceforge.net/mpi/index.html mpi] packages could perhaps be adapted for this. | * Having {{Codeline|parfor}} functioning would speed code development and execution now that multicore architectures are widespread. See [http://octave.1599824.n4.nabble.com/Parfor-td4630575.html here] and [http://stackoverflow.com/questions/24970519/how-to-use-parallel-for-loop-in-octave-or-scilab here]. Existing code from the [[Parallel package | parallel]] and [http://octave.sourceforge.net/mpi/index.html mpi] packages could perhaps be adapted for this. | ||
* Develop a performance benchmark for Octave (interpreter, load/save, plotting, etc., but not simply tests of underlying libraries such as BLAS or LAPACK). This benchmark could be run periodically to make sure that changes during development do not introduce regressions in performance. | * Develop a performance benchmark for Octave (interpreter, load/save, plotting, etc., but not simply tests of underlying libraries such as BLAS or LAPACK). This benchmark could be run periodically to make sure that changes during development do not introduce regressions in performance. | ||
= | =Packaging= | ||
* create a system that allows packages to deprecate functions as in core. Possibilities are: | * create a system that allows packages to deprecate functions as in core. Possibilities are: | ||
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** subdirectories with makefiles and top level make command of: cd <subdir> && ${MAKE}... ok as a substitute? | ** subdirectories with makefiles and top level make command of: cd <subdir> && ${MAKE}... ok as a substitute? | ||
* make pkg able to supply extra configure and make flags, useful for distributions, including -j for make (pkg now passes --jobs=N automatically, CFLAGS and CXXFLAGS environment variables are already respected, what's missing?) | * make pkg able to supply extra configure and make flags, useful for distributions, including -j for make (pkg now passes --jobs=N automatically, CFLAGS and CXXFLAGS environment variables are already respected, what's missing?) | ||
=Preferences= | =Preferences= | ||
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** RESOLUTION | ** RESOLUTION | ||
* Searching the m-files for use of {{Codeline|persistent}} should turn up other opportunities to use preferences. | * Searching the m-files for use of {{Codeline|persistent}} should turn up other opportunities to use preferences. | ||
=Bugs= | =Bugs= |