Re: plot matrix?

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

 
> 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.

This much does work:
  plot 'A' matrix with image, 'B' matrix using 1:($3==0?NaN:$2) with points

Confusion:
  plot 'A' matrix using 1:2:3 with image, 'B' matrix using 1:2:3 with labels

This prints "1" everywhere.  Why "1"?
Where did the real matrix contents go?  Are they in some other pseudo-column?

Worse:
  plot 'B' matrix using 1:2:(strcol(3)) with labels
       Segmentation fault