coloring in imagesc

Question

Can the functions A, B, and C be different colors?

Z = A + B + C;
imagesc(Z)
colormap(gray)

Answer 1

Not if you add them like that, because that makes it only one function.

Answer 2

If you have the image processing toolbox, you can use IMSHOW to display A,B, and C as red, green and blue, respectively:

Z = cat(3,A,B,C);
imshow(Z)

You may need to scale A,B, and C so that their values go from 0 to 1, though.