Difference between pcolor() and imagesc() in Matlab

A simple matrix is plotted using both pcolor() and imagesc() commands in Matlab. And the difference between them are shown in the following figure:

% Difference between pcolor and imagesc

A=[ 1  2  3  4;

    5  6  7  8;

    9 10 11 12;];

figure (1); clf; set(gcf,'Color',[1 1 1]);

subplot(1,2,1);

pcolor(A); colorbar;

title('pcolor(A)')

subplot(1,2,2);

imagesc(A); colorbar;

title('imagesc(A)')

Basically, pcolor() does not show the last column and row of the matrix. Although the original matrix is 3x4, the pcolor() plot shows 2x3 submatrix.