Fastest way to access another matrix for all nonzero rows

Hi I am new to MATLAB and I have been looking on here for 20 minutes.

I am able to do this with multiple lines of code using find and reshaping but I wondered if theres a one or two line way.

The full row on matrix A must be zeros to discard it.

    A = [ 4 8 2; 0 0 0; 1 4 6; 0 0 0] 
    B = [ 8 9 3; 2 8 1; 9 2 0; 1 4 2]

Desired result would be:

    result = [8 9 3; 0 0 0; 9 2 0; 0 0 0]

The matrix is too large to select rows specifically. Please help.

Answer 1

[per isakson]

>> B( all( A==0, 2 ), : ) = 0
B =
     8     9     3
     0     0     0
     9     2     0
     0     0     0