plotting on top of images

[John W. Eaton]

On 26-May-2009, Ben Abbott wrote:

| While I don't recall the details, I have a test script related to that  
| changeset. It is attached.
| 
| Presently, it fails for me with and without the semicolon (but  
| slightly differently). I've attached the gnuplot errors as well.
| 
| Ben
| 
| 
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| Without the ";"
| 
| octave:10> multiplot
| octave:11> 
| multiplot> splot "-" binary format='%float64' record=49x49 using ($1):($2):($3):($4) title "" with pm3d linestyle 1 splot "-" binary array=2x2 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image splot "-" binary array=4x4 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image splot "-" binary array=2x2 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image splot "-" binary array=4x4 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image ;
|                                                                                                                     ^
|            line 0: ';' expected
| 
| 
| Now with the ";"
| 
| octave:11> multiplot
| octave:12> 
| multiplot> splot "-" binary format='%float64' record=49x49 using ($1):($2):($3):($4) title "" with pm3d linestyle 1 splot "-" binary array=2x2 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image; splot "-" binary array=4x4 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image; splot "-" binary array=2x2 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image; splot "-" binary array=4x4 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image; splot "-" binary array=2x2 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image; splot "-" binary array=4x4 scan=yx origin=(1,1) dx=1 dy=1 using 1 title "" with image; ;
|                                                                                                                     ^
|            line 0: ';' expected

These multiple splot commands come from the

  hold on
  colorbar
  imagesc(1./hilb(2));
  hold off

  hold on
  imagesc(1./hilb(4));
  hold off

commands?  I don't see that at all.  If I look at what's sent to
gnuplot, I don't see any splot commands.  Also, with the current
sources, I don't see any errors unless I make the change I proposed
here:

  https://www-old.cae.wisc.edu/pipermail/bug-octave/2009-May/008613.html

So I guess that change is not the right thing.  But without it,
plotting lines on top of images is broken.  I think we need a fix for
this problem before we release 3.2.0.

jwe