How to manipulate matrix elements ?

If i have a matrix 'A' (with logical elements) and I want to create another matrix B such that its elements are the column numbers for which elements in A are '1', operating on 1 row at a time.

eg

or

[José-Luis]

Who haz teh codez?

[Oleg Komarov]

@Mandar: for such simple example we would appreciate if you posted hardcoded examples instead of images.

[Azzi Abdelmalek]

I can't see your images, just two frogs

Answer 1

[Andrei Bobrov]

out = A';
out(out>0) = [B1,B2];
out = out';

or

bsxfun(@times,A,1:size(A,2))