insertImage(Ib, Is, ij)

Inserts small image into a big one. Can also be used to pad arrays arbitrarily.

It can be used to put an array inside another array at an arbitrary location. It is sensitive to edges and correctly crops as needed.
Example:
A = zeros(10);
B = rand(5);
ij = [7,7];
I = insertImage(A, B, ij);

figure,
imagesc(I)
axis equal tight