PCOLOR PCOLOR Pseudocolor Plot

Usage

This routine is used to create a pseudocolor plot of the data.
A pseudocolor plot is a essentially a surface plot seen from 
above.  There are two forms for the pcolor command:

   pcolor(C)

which uses a rectangular grid.  Alternately, you can specify
X,Y matrices or vectors.

   pcolor(X,Y,C)

