# How to swap array element from two arrays conditionally

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Ted Baker on 4 Dec 2019
Commented: Ted Baker on 4 Dec 2019
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);

Akira Agata on 4 Dec 2019
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 on 4 Dec 2019
Thank you very much for introducing me to the technique, along with a very clear example. It now works perfectly in my application. :)

JESUS DAVID ARIZA ROYETH on 4 Dec 2019
C=A;
C(B~=0)=B(B~=0)
C=max(A,B)

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