Add a row to a matrix where find==1

Hello! I've a matrix A and a vector f:

A =  9     6     5
     9    10     9
     8     7     1
     2     9     2
     7     5     2

f = [0; 0; 1; 1; 0]

I want to add the matrix A rows to a matrix B, where f == 1. It is very simple with a for cycle, but I need not to use it, because of very large matrix.

B = [8 7 1
     2 9 2]

How can I do that? Thanks.

Answer 1

[Grzegorz Knor]

B + A(logical(f),:)

[Jan]

Or: B + A(f==1, :)