pcolor in octave 3.0 requires same dimension

[David Bateman]

Puck Ja wrote:
> I just upgraded to octave 3.0 and was so glad to find "pcolor" is
> available without any addon, such as octplot.  My main usage is to
> display a 2D matrix. However, one thing strange to me is that pcolor
> requires equal dimension (x=y) to work. 
> octave:6> pcolor(mat)
> error: surface: x, y, and z must have same dimensions
> error: evaluating if command near line 95, column 7
> error: evaluating if command near line 87, column 5
> error: evaluating if command near line 76, column 3
> error: called from `surface:__surface__' in file
> `/usr/local/share/octave/3.0.0/m/plot/surface.m'
> error: called from `surface' in file
> `/usr/local/share/octave/3.0.0/m/plot/surface.m'
> error: evaluating assignment expression near line 48, column 7
> error: called from `pcolor' in file
> `/usr/local/share/octave/3.0.0/m/plot/pcolor.m'
> 
> Why is that limitation.  Certain I can work around it by making a larger
> square matrix and then using axis([x1 x2 y1 y2]) to make it display what
> I look for, but that is way to silly.  Is there any other way to work
> around it?
> 
> Thanks!
> 
> Puck
> 

I suspect something like the attached is needed, but Kai should probably
comment.

D.
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