How to make 2 matrix out of 1 one matrix??

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Ali nouri 2020-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/554443-how-to-make-2-matrix-out-of-1-one-matrix

评论： Alan Stevens 2020-6-26

Hi Guys,

I have a 8760X30 matrix, which is included with the positive and negative number. Now I want to make 2 matrix of the originally matrix with the same dimension.

The difference is in one matrix should included the possitive number from the originally matrix and replace the negatives with zero, and in the other matrix should included with negative value and replace positive number with zero.

How can I do it?

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Answer 1

Alan Stevens 2020-6-25

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If your first matrix is A, then:

ix = find(A>0); B = A; B(ix) = 0;
ix = find(A<0); C = A; C(ix) = 0;

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Sugar Daddy 2020-6-26

using find is inefficient in such kind of scenaria.

Alan Stevens 2020-6-26

I agree that the "find" version is not the most efficient. However, sometimes clarity is more important than efficiency, and I suggest that, for a novice, the "find" version is clearer.

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