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

I just padded the matrix prior to pcolor and I think it's the effect you wanted. The reason it works comes from the help doc for pcolor, which states that

In the default shading mode, 'faceted', each cell has a constant color and the last row and column of C are not used.

m = 12;
n = 8;
A = randi(5,[m n]);
Arot = flipud(A);
Arot = [ Arot; Arot(end,:) ];
Arot = [ Arot, Arot(:,end) ];
pcolor(Arot);figure(gcf);
for i = 1 : n
  for j = 1 : m
    text(i + .5 , j + .5 ,num2str(Arot(j,i)),'FontSize',18);
  end
end