Re: octave's graphics interface / linux operating system

--- Stefan Pofahl <stefan@...> wrote:
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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