Question

I have one matrix data like that:

   1      2    3  

1: 1.0    2.0  5.0 
2: 2.0    2.0  5.0              
3: 4.0    0    5.0

And another matrix test like this:

   1      2    3  

1: 3.0    0     0 
2: 0      5.0   0              
3: 0      0    3.0

The problem: set data so that: data(i,j) = 0 when test(i,j) == 0

My code for that:

for i=1:N
        for j=1:M
                if test(i,j) == 0
                        data(i,j) = 0;
                end 
        end 
end 

Question: Is there a loop-free way to do this/

Answer 1

Yes. Try this

 data(find(test==0)) = 0;

or as @Peter says in comment below, this simpler form will suffice

 data(test==0) = 0;