Re: problem with gnuplot and octave, 2.9.19, MSVC build on windows XP

[David Bateman]

N. B. wrote:
> Hello,
> I need help with two things:
> 1) How can I change the graphics backend back and forth without quitting
> octave?

pkg load jhandles
pkg unload jhandles

> 2) Currently, when I set the default backend to gnuplot, I get an error:
> (I copy and paste from cmd.exe window:)
> error: drawnow: failed to open connection to gnuplot
> error: evaluating if command near line 117, column 3
> error: called from `drawnow:open_gnuplot_stream' in file
> `E:\Programs\Octave\share\octave\2.9.19\m\plot\drawnow.m'
> error: evaluating if command near line 78, column 8
> error: evaluating if command near line 77, column 6
> error: evaluating if command near line 74, column 4
> error: evaluating if command near line 72, column 2
> error: evaluating for command near line 71, column 7
> error: evaluating if command near line 45, column 5
> error: called from `drawnow' in file
> `E:\Programs\Octave\share\octave\2.9.19\m\plot\drawnow.m'
>  
> However, if I set the backend to "jhandles" (in a startup file deep in
> the octave file hierarchy), it runs fine.
> Probably you won't need it, but a very simple 3-line script is attached
> that demonstrates the problem, provided that it's not a mysterious
> unreproducible issue on other machines.

Don't know, haven't tested the 2.9.19 windows binary, but for some
reason gnuplot is not being started..

D.