notes/software/octave.md

Long output format, disable more and crash dumps

format long;
more off;
crash_dumps_octave_core(0);

Set compiler and linker for C++ code

Version: Octave 3.8.1, FreeBSD 10.0

Octave is compiled with gcc 4.7 on FreeBSD, while default compiler is clang. When a MEX module is compiled using Octave, the default compiler is used, and the compiled module does not work. This problem can be avoided by forcing Octave to use gcc as compiler and linker:

setenv ('CXX', 'g++47')
setenv ('DL_LD', 'g++47')

FLTK and printing offscreen images

Version: Octave 3.8.1

Setting: A script which redraws and prints a figure iteratively.

Problem: If the X-windows screen where the script is running is not active, printing does not work.

Should be fixed in the new versions: http://octave.1599824.n4.nabble.com/Offscreen-rendering-with-OSMesa-and-gl2ps-td4667963.html

Printing figures with overlayed axes

Version: Octave 3.8.1

Setting: Two overlappping axes are created on the same figure

ax1 = axes('Position', [0.05 0.05 0.9 0.9]);
ax2 = axes('Position', [0.65 0.60 0.3 0.35]);

The first is with 3D plot the second -- with 2D plot. The second one is intended to be cover a part of the first one.

Problem: The figure is displayed as intended, but the printed version is mangled. The first axis is partially drawn on the top of the second one.

Workaround: Draw and print each axis separately, then overlay eps files as described in 'postscript_pdf.txt'.

Compatibility with MATLAB

                            MATLAB          Octave

---

Empty cell {} cell(), {}

or(1) fails works

some_array{end+1} = 1 not supported supported

Default values for function not supported supported parameters

Splitting a string with

strsplit('str', '_')        not supported   supported
regexp('str','_','split')   supported       supported

Broadcasting when using not supported supported

cellfun()