Plot a matrix, values as colors

Question

I have random matrix with arbitrary dimensions and I want to assign a color for each value (randomly or not) and plot the matrix with numbers like,

Answer 1

Using imagesc instead of pcolor solves the problem. It also brings some other benefits:

• Avoids the need for flipud;
• The coordinates of the text objects become integer values;
• Axes are automatically set to "matrix" mode, with the origin in the upper right corner.

Code:

m = 8;
n = 6;
A = randi(5,[m n]);
imagesc(A);
for ii = 1:n
    for jj = 1:m
        text(ii, jj, num2str(A(jj,ii)), 'FontSize', 18);
    end
end

For

A =
     4     5     4     2     4     4
     5     4     3     4     4     2
     5     4     1     1     1     3
     4     3     5     2     5     4
     1     2     2     2     5     3
     1     5     2     5     1     3
     4     3     1     3     3     1
     3     1     2     4     2     3

this produces