Re: gnuplot output from print?

[Søren Hauberg]

John W. Eaton skrev:
> Since I find that I often need to see precisely what commands Octave
> is sending to gnuplot (see the bug report from today about line colors
> vs the -mono option for the print command) I made the following
> changes.  Now if you use the option -debug=FILE with the print
> command, Octave will also write all the commands it sends to gnuplot
> to the file FILE (with just -debug, it writes to the file
> octave-print-commands.log).
This is great! A couple of comments though:

1) A semi-colon is missing in 'print'. Patch attached.

2) I think it's a shame that this is reduced to a debug feature. Octave 
will never support every little weird feature of gnuplot, so it can be 
very handy to be able to tweak a plot in gnuplot. This feature can 
provide you with a rough gnuplot file that you can work from, when doing 
this tweaking. I think it would be more nice to have a 'print -dgnuplot' 
style syntax for this feature. But this an extremely small issue.

3) I can't figure out how to use it :-)

  >> plot(sin(linspace(0, 2*pi, 100)))
  >> print -debug=TEST.gp
  lpr: Error - no default destination available.

After this I have a file called '=TEST.gp'. So, to avoid having a file 
with '=' in the filename, I tried removing it

  >> print -debug TEST.gp
  convert: unable to open module file
  `/usr/lib/ImageMagick-6.2.4/modules-Q16/coders/gp.la': No such file or
  directory.

After this, TEST.gp seems to contain postscript data.

  >> print -debug TEST.gnuplot
  convert: unable to open module file
  `/usr/lib/ImageMagick-6.2.4/modules-Q16/coders/gnuplot.la': No such
  file or directory.

Could you show me a simple example of how to use the feature?

Thanks,
Søren

Index: scripts/plot/print.m
===================================================================
RCS file: /cvs/octave/scripts/plot/print.m,v
retrieving revision 1.21
diff -r1.21 print.m
123c123
<   debug_file = "octave-print-commands.log"
---
>   debug_file = "octave-print-commands.log";