How to swap array element from two arrays conditionally

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Ted Baker 2019-12-4

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评论： Ted Baker 2019-12-4

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);

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Answer 1

Akira Agata 2019-12-4

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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);