Problem description

In an octave sesion, when executing a (any) command, throw an error:

error: feval: /usr/lib/octave/5.2.0/oct/x86_64-pc-linux-gnu/init_fltk.oct: failed to load: libfltk_gl.so.1.3: cannot open shared object file: No such file or directory
error: called from
graphics_toolkit at line 91 column 5
figure at line 91 column 7
gcf at line 63 column 9
tmrepl at line 41 column 21
~/.TeXmacs/plugins/octave/octave/tmstart.m at line 47 column 1
warning: gh_manager::do_close_all_figures: some graphics elements failed to close.

Problem reproduction

• Without fltk or gnuplot installed on the system. By default, octave will use qt as the plot engine.
• Open TeXmaxs, open an octave session, execuate any command

Problem attribution

From /octave/progs/init-octave.scm, it seems that the command to open a new octave instance is "octave-cli". I tried to execute "available_graphics_toolkits", the result is

ans =
{
[1,1] = fltk
}.

Also, the result of command "graphics_toolkit" in octave is

ans = fltk.

After I searched for any similar issue, I found this. Perhaps it's because octave-cli does not recognize "qt" as a plot toolkit.

Possible solution

• Use "octave --no-gui" as the command to create a new octave instance.
• Install fltk or gnuplot package

pi
format long
pi
format long e
pi
pi * 1000

Possible solution: use fdisp and then load the string from the temporary file.

a = 1; a

The result of a should be printed.

On OSX 10.13.6 and OSX 10.15.7 plotting sessions with MacPorts octave_6.2.0_0 using the 1.99.19 octave-plugins (i.e. the one that comes with TeXmacs 1.99.19 as well as the latest upgrade as of 2021.03.13 from GitHub) seem to be somewhat flawed.

• Multi-line sessions do not produce in-line graphics.

• Plotting output, however, can be written to disk.

I do understand that the maintainers recommend usingoctave_5.x. Interestingly enough though, the older 1.99.18 octave-plugin in this respect works better, both, with TeXmacs 1.99.19 and octave_6.1.0_0/octave_6.2.0_0: Multi-line octave session run and produce in-line graphics.

Will this issue be addressed one of these days?

Cheers Tilda

Using Octave from https://octave-app.org/.

Here is the pattern:

/Applications/Octave-5.2.0.app/Contents/Resources/usr/Cellar/[email protected]/5.2.0/bin/
/Applications/Octave-6.1.0.app/Contents/Resources/usr/Cellar/[email protected]/6.1.0/bin/

I am getting a busy message when I insert an octave session

I am running octave 6.2.0 on windows 10

same as #2

Fix https://github.com/texmacs/octave/blob/master/octave/convert/str2scm.m

Plotting in a session doesn't always work.
If I put these lines in a session

octave>  x = [-pi:0.1:pi];
octave>  hold on;
octave>  plot(x,sin(x));
octave>  plot(x,cos(x))

and repeatedly execute the last two commands, after two times the plot doesn't show up anymore. It seems the method to set TM_OCTAVE_PLOT_DIGEST is not robust.
It seems like if we simply do

    if disp_ans
      tmplot (); ## call TeXmacs plotting interface
      clf()
    endif

in tmrepl.m that plots show as expected, since tmplot() already checks whether the plot is empty or not.

The cursor is misleading.

Problem Description

From #4, there will be a flash of the octave gui when a session is started because the plugin now starts 'octave' rather than 'octave-cli' for the issue of plotting through qt.

Environments Reproduced

• Linux: Manjaro KDE

Further revisions and discussions need.