Help with plotting an information grid

I have a n x n matrix, all of whose elements are either 0,1,2,3 or 4. Now I want to represent this matrix in the form of a n x n grid such that each block(cell) of the grid is colored according to the corresponding element in the matrix(say 0- white, 1 -red, 2- blue and so on). How do I do this?

Answer 1

[Andrew Newell]

You should be able to do it with pcolor.