How to filter a binary matrix through a binary vector?

Say I have a binary vector E and a binary matrix S,

E = [0 1 1 0 0]

S = [1 1 0 1 0; 1 1 1 1 1; 1 0 0 1 1]

I'm looking to find a matrix S_E that 'filters' the matrix S through the vector E, such that the new filtered matrix S_E only contains the placeholder values of the matrix S where there are 1's in the matrix E. So the matrix S_E would look like,

S_E = [1 0 ; 1 1 ; 0 0]

Is there any way to implement this?? Any help would be greatly appreciated.

Thanks!

Answer 1

[Rik]

Here are two ways to do this:

E = [0 1 1 0 0];
S = [1 1 0 1 0; 1 1 1 1 1; 1 0 0 1 1];
S_E=S(:,logical(E));

E = [0 1 1 0 0];
S = [1 1 0 1 0; 1 1 1 1 1; 1 0 0 1 1];
E_expanded=repmat(logical(E),size(S,1),1);
S_E=reshape(S(E_expanded),[],sum(E));

[Dipie11]

Unreal man thank you so much!