gnuplot image code

[John W. Eaton]

On 20-Oct-2006, Quentin Spencer wrote:

| Attached is a modified version of Dan's code for displaying images in 
| gnuplot (versions >=4.1). I have reorganized the code a bit, but I put 
| Dan's name in the copyright notice, since what I did was mostly cutting 
| and pasting. I'm including 3 files: a patch to image.m, 
| __gnuplot_version__.m, which returns the version of gnuplot, and 
| __img__.m, the low-level interface with gnuplot. I have opted to put 
| only the gnuplot specific code in __img__.

OK, I checked in the changes to image.m and the new __img__.m file.

I changed the line

| +  if __gnuplot_version__ > 4.0

to be

  if (compare_versions (__gnuplot_version__, "4.0", ">"))

since __gnuplot_version__ now returns a character string, and also
because version numbers like 4.10 are usually interpreted to be
greater than 4.9.

jwe