[changeset] clarification to pcolor doc-string

[John W. Eaton]

On 23-Sep-2008, Kai Habel wrote:

| in 2007 I implemented the interp shading mode for the gnuplot backend.
| But it was so slow that I did not suggest a patch for that. If I
| remember correctly the usage of 'interpolate 3,3' for pm3d [1] has
| increased the time for a plot by a factor of ten. But for a really
| smooth plot something like interpolate 5,5 or even more would be
| necessary - with even longer plotting times.

I can't seem to figure out how to make pm3d interpolation work at
all.  Using the command "set pm3d interpolate 10, 10" doesn't seem to
have any affect when I use it (I'm working directly in gnuplot).  Can
you post a simple example?  I'd like to see what it does, even if it
is slow.

Thanks,

jwe