Re: octave's graphics interface / linux operating system

[Sergei Steshenko]

--- Stefan Pofahl <address@hidden> wrote:

> Hello Sergei,
> 
> this is to me a bit to cryptic, can you provide a practical
> example?
> 
> Regards,
> 
> Stefan
> 
> ***
> 
> 2008/5/12, Sergei Steshenko <address@hidden>:
> >
> >
> > --- David Bateman <address@hidden> wrote:
> >
> > > Dieter Jurzitza wrote:
> >
> >
> >
> > Well, 'octave' has 'gnuplot_binary' command.
> >
> > Using it one can use gnuplot impersonator which intercepts octave's STDOUT
> > with 'gnuplot'
> > commands - I used to have a Perl script doing this and writing its STDIN
> > to file, parsing it on
> > the fly.
> >
> > Regards,
> >   Sergei.
> >
> >
> > Applications From Scratch: http://appsfromscratch.berlios.de/
> >
> >
> >
> >
> >       
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> >
> 
> 
> 
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Well, with the attached example it will probably be even more cryptic :-) ...

The idea of the script was:

1) to store data sent to 'gnuplot' in temporary files;
2) when actual 'plot' command is encountered, to call 'gnuplot' with the 
temporary
files.

For this particular script to work I had to slightly change 'octave' plotting 
routines
to produce more easily parseable output.

This all was done in order to enable mouse zooming - the released gnuplot-4.2.3 
does
not have mouse zooming woeking when input comes to it through STDIN; recent 
binary
snapshots have this problem resolved, so I do not need the script anymore.

Anyway, in the attached script 'main_loop' routine iterates over STDIN lines, 
separating
the stream into commands - see $commands_file, $_commands_file_fh and data - see
$data_file, $_data_file_fh.

The

    152           $line =~ s/^"-"/"$data_file"/;

line substitutes "-", i.e. the instruction for 'gnuplot' to accept data from 
STDIN
with "$data_file", i.e. the instruction for 'gnuplot' to accept data from 
$data_file.

The script was a hack, but it illustrates the idea of intercepting STDIN.

...

For your purposes you can probably also specify 'gnuplot' using 
'gnuplot_binary' more
or less this way:

gnuplot_binary("| tee gnuplot_input.txt | /actual/path/to/gnuplot");

or just

gnuplot_binary("| tee gnuplot_input.txt | gnuplot");

- in the above 'tee' will both write everything sent to 'gnuplot' to 
'gnuplot_input.txt' file and
will send to 'gnuplot' what's been sent to it by 'octave'.

Try http://linux.die.net/man/1/tee to read 'tee' manpage.

Regards,
  Sergei.

Applications From Scratch: http://appsfromscratch.berlios.de/


      
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gnuplot_impersonator.pl
Description: 161335766-gnuplot_impersonator.pl