MATLAB pcolor()

A pseudocolor plots is a rectangular array of cells with colors persistent by C.

Syntax

pcolor(C) // It draw a pseudocolor plot. The items of C are linearly mapped to an index into the current colormap.
pcolor(X,Y,C) // It draw a pseudocolor plot of the items of C at the locations stated by X and Y. The plot is the logically rectangular, two-dimensional grid with vertices at the points [X(i,j), Y(i,j)]. 
h = pcolor(...) // It returns a handle to a surface graphic object.

Example

z^2=x^2+y^2-5 sin?(xy)
|x|≤2,|y|≤2.
r=-2: .2:2;
[X, Y]= meshgrid (r, r);
Z=X.^2- 5*sin(X.*Y)+Y.^2;
pcolor(Z), axis('off')
shading interp

Output:

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