Re: Gnuplot and Octave.

[Ethan M. <merritt@u.washington.edu>]

On Friday 20 February 2004 02:54 pm, Hans-Bernhard Broeker wrote:
>
> Not after the fact.  gnuplot does not generally keep plotted data in
> memory after the plot has been drawn, so it can't report them back to
> octave, either.  This kind of data copying would have to be done at the
> octave end of the connection instead.  There's, again, an exception to
> this, but it only applies to mouse-enabled versions, and then only to 3D
> plots, IIRC.

Only 2D I think you mean?  The x11 mousing code stores the axis
info so that it can translate mouse clicks into plot coordinates.
But it only does such translation for 2D plots.

The outboard x11 driver, gplt_x11, stores most of the plot information
implicitly. It needs this anyway in order to continuously display plots,
even old plots, on the screen. There is a code stub in
gplt_x11.c just waiting to pass mousing events from prior windows
back to external applications. But as of now it is commented out
because we have no such interface defined.

If some interested parties on both the gnuplot and octave side work
to define such an interface, I believe it would not be a tremendous
amount of work to export data on demand from gnuplot_x11 to an
octave session.


-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center    (206)543-1421
Mailstop 357742
University of Washington, Seattle, WA 98195