How to swap array element from two arrays conditionally

I'm looking to plot a matrix using data from two arrays. If the second array has a number which is not zero in an element, this element is moved into the first array. I have seen how this might be done using deal(), but I would like to avoid using a loop with if statement for performance reasons. Is there a convenient way of doing this?

An example of this is follows, with arrays A, B and C ( the result);

Answer 1

[Akira Agata]

By using indexing technique, you can simply do this kind of task.

The following is an example:

% Original matrixes
A = [...
  0 1 1 1 0 0;...
  0 0 0 0 0 0;...
  0 0 0 0 0 0];
B = [...
  0 3 0 0 4 0;...
  0 2 0 0 2 0;...
  0 0 0 0 0 0];

% Creating C by using index
idx = B ~= 0;
C = A;
C(idx) = B(idx);

[Ted Baker]

Thank you very much for introducing me to the technique, along with a very clear example. It now works perfectly in my application. :)

Answer 2

[JESUS DAVID ARIZA ROYETH]

C=A;
C(B~=0)=B(B~=0)

also could help you:

C=max(A,B)