How to have elementwise multiplication expand in two dimensions?

So I'm trying to optimize my code, and one aspect where it could really improve is to change one for loop to a SIMD instruction.

In short, I have two variables: A (16 x 16 x 3 x 100) and B(16 x 16 x 3 x 7)

What I want to do is to get an elementwise multiplication that expands to both the 100 and 7 dimensions, concatenating and returning a variable of size C (16 x 16 x 3 x 700).

If i do A .* B(:, :, :, 1) it automatically expands to the 100, but then i'd need a 7 iteration for loop concatenating along B.

How do i do this without a for loop?

Thanks!

Answer 1

[Matt J]

C=A.*reshape(B,[16,16,3,1,7]);

C=reshape(C,[16,16,3,700]);

[AlexRD]

Thanks, that does it!