bsxfun implementation in matrix multiplication

Question

As always trying to learn more from you, I was hoping I could receive some help with the following code.

I need to accomplish the following:

1) I have a vect

Answer 1

If your vector x is of lenght = 12 and your matrix of size 3x4, I don't think that using one or the other would change much in term of time. If you are working with higher size matrix and vector, now that might become an issue.

So first of all, we want to multiply a vector with a matrix. In the for-loop method, that would give something like that :

s = size(A);
new_matrix(s(1),s(2),numel(x)) = zeros;   %This is for pre-allocating. If you have a big vector or matrix, this will help a lot time efficiently.

for i = 1:numel(x)
    new_matrix(:,:,i)= A.*x(i)
end

This will give you 3D matrix, with each 3rd dimension being a result of your multiplication. If this is not what you are looking for, I'll be adding another solution which might be more time efficient with bigger matrixes and vectors.