create a new matrix with combining two matrices with the same size

Question

Maryam Hamrahi 2016-8-4

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回答： Paul Sponagle 2016-8-4

My aim is to create a new matrix which the same rows in matrix A and matrix B are zero. the same rows in matrix A which are zero, should also be zero in matrix C.

I want to create matrix C from matrix B.

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Azzi Abdelmalek 2016-8-4

The explanation is not clear

Paul Sponagle 2016-8-4

在 MATLAB Online 中打开

Is this what you are trying to do?

A=[1,2;0,0,;3,2;0,0]
B=[7,2;3,6;4,5;2,6]
C=B;
C(A==0)=0

Results in:

This will work for all elements of A that are zero. If you only want to modify B if both elements in the row of A are zero this won't work.

Rather than guessing your intent I provided the simpler solution.

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Answer 1

Azzi Abdelmalek 2016-8-4

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C=B
C(~any(A,2),:)=0

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Maryam Hamrahi 2016-8-4

Thanks a lot Azzi Abdelmalek.

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Answer 2

Paul Sponagle 2016-8-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298467-create-a-new-matrix-with-combining-two-matrices-with-the-same-size#answer_230802

在 MATLAB Online 中打开

I put this in comments, it should have been in the 'Answers' section.

The question was not quite clear, but I think this might also work:

A=[1,2;0,0,;3,2;0,0]
B=[7,2;3,6;4,5;2,6]
C=B;
C(A==0)=0

Results in:

This will create C by copying and modifying B for all elements of A that are zero. If you only want to modify B if both elements in the row of A are zero this won't work and you need to see Aziz's answer.

Paul