Re: plot matrix?

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

On Sunday 22 November 2009, Philipp K. Janert wrote:
> 
> Thanks, this is very helpful. 
> 
> I see now that "matrix" makes sense with "plot",
> but only with style "image". Is this correct? Are
> there legitimate uses for "matrix" with "plot", when
> using different styles?

I don't have a real-life example plot to show, but it seems
plausible to me there is a use for superimposing additional
layers of information on top of a heat map.  

Suppose that I have two matrices
A:	generally non-zero value A(x,y) to be shown as a heat map
B:    B(x,y) = 0 except for a small number of special cases.
	These I want to show as circles or labels or something.

Then this would draw a heat map with labels on the interesting
points:

  plot 'A' matrix with image, 'B' matrix using (something) with labels

... but it doesn't.  It produces the error
  Plot style does not conform to three column data in this graph mode
I think we're back to the confusion about what 'using' means in this context.

> Also, can you give me a pointer to the manual
> section you were referring to at the very end of
> your email? I can't seem to find it.

Perhaps the section below (page 48 in the pdf manual built for 4.4.rc1)?
  II. Plot styles
      35.   Image

This reminds me that the set of pdf manuals on the web site
should be updated in parallel with the release of 4.4.
Anyone want to help with that?