If the number of columns are the same, you can insert array2 into array 1 starting at row k like this:
outputArray = [array1(1:k-1,:); array2; array1(k:end,:)];
If the number of rows are the same, you can insert array2 into array 1 starting at column k like this:
outputArray = [array1(:, 1:k-1), array2, array1(:, k:end)];
If the number of rows and columns are different, then you'd basically have to paste the smaller on onto the larger one, overwriting values, or else insert a slab of zeros and then overwrite the zeros.
