numbering rows and then using these numbers for another vector of equal n dimensions

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Bran 2013-3-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/66041-numbering-rows-and-then-using-these-numbers-for-another-vector-of-equal-n-dimensions

If I have a matrix for example

A = [ 1 2 3; 1 2 5; 0 55 8; 0 0 0; 7 8 9; 4 0 5; 0 0 0] and I have a vector
B = [ 1; 2; 3; 4; 5; 6; 7].

(please note these are small for simplicity but my actual matrices and vectors are much bigger)

Now say I wanted to record the row numbers at which all three columns contained zeros and then replace the numbers in B at these particular rows with zero also so I would be left with

B = [1; 2; 3; 0; 5; 6; 0]

How would I do that. I think I need to use the ind2sub function but I cant get my head around how to do this

many thanks in advance :)

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采纳的回答

Walter Roberson 2013-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/66041-numbering-rows-and-then-using-these-numbers-for-another-vector-of-equal-n-dimensions#answer_77542

在 MATLAB Online 中打开

B( ~any(A,2) ) = 0;

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Azzi Abdelmalek 2013-3-6

在 MATLAB Online 中打开

This is not right

A = [ 1 2 3; 1 2 5; 0 55 8; 0 0 0; 7 8 9; 4 0 5; 0 0 0] 
B = [ 1; 2; 3; 4; 5; 6; 7]
B( ~any(A,2) ) = 0
B =
     1
     2
     3
     0
     5
     6
     0