Re: Setting a gnuplot command line option from within Octave

[John W. Eaton]

On 16-Apr-2009, Ben Abbott wrote:

| On Apr 15, 2009, at 2:44 PM, John W. Eaton wrote:
| 
| > On 14-Apr-2009, E. Joshua Rigler wrote:
| >
| > | On Tue, Apr 14, 2009 at 5:12 PM, Ben Abbott <address@hidden>  
| > wrote:
| > | >
| > | > On Apr 14, 2009, at 4:17 PM, E. Joshua Rigler wrote:
| > | >
| > | >> I'm running Octave 3.0.4, and have the "plot" package installed  
| > from
| > | >> Octave Forge in order to use the ginput.m function. A One  
| > problem: A I
| > | >> cannot read in the 'q' character without closing the plot window.
| > | >> Gnuplot seems to have a '-ctrlq' command line option that  
| > forces the
| > | >> user to type Ctrl-q to close an open plot window, but I'm not  
| > sure how
| > | >> to take advantage of this from within Octave. A Any suggestions?
| > | >>
| > | >> -EJR
| > | >
| > | > The gnuplot manual indicates you can add 1rygnuplot*ctrlq1ry to  
| > A your .Xdefaults
| > | > or .Xresources file and get what you want.
| > | >
| > | > If it works, let us know. I tried to to this on Mac OSX Leopard.  
| > However, I
| > | > ended up with problems running my X11.
| > | >
| > | > Ben
| > |
| > | Huh, I guess I didn't dig deep enough into the help to find that.  A
| > | quick test confirms that this does what I expect, at least once I  
| > call
| > | xrdb to reload the X resource file.  I'll post a follow-up if I run
| > | into any problems later on.   FYI, I'm running Octave on RH  
| > Enterprise
| > | v4, 64-bit.  Thanks for the tip.
| >
| > Maybe we should change the gnuplot_binary function to accept
| > additional arguments that could be passed to gnuplot?
| >
| > jwe
| 
| I tried doing that, but got an error. Perhaps *I* made a mistake. Does  
| it work for you?

I checked in the following change.

  http://hg.savannah.gnu.org/hgweb/octave/rev/ff8d7f3ad203

Now you should be able to pass -ctrlq to the gnuplot subprocess using
(for example):

  [old_prog, old_args] = gnuplot_binary ();
  gnuplot_binary (old_prog, old_args{:}, "-ctrlq");

Or, you can add -persist to the gnuplot options so that the gnuplot
window will stay open after you exit Octave.

jwe