Consider only a positive numbers of the first columns.

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Francesco 2014-3-1

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https://ww2.mathworks.cn/matlabcentral/answers/119688-consider-only-a-positive-numbers-of-the-first-columns

评论： Francesco 2014-3-1

采纳的回答： Mischa Kim

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I have this matrix:

A =

   -0.0001   -0.0723    0.0007    0.0013   -0.0007   -0.0016   -0.0009    0.0010   -0.0018
   -0.0004   -0.0723    0.0008    0.0012   -0.0008   -0.0017   -0.0009    0.0011   -0.0017
   -0.0005   -0.0723    0.0007    0.0013   -0.0008   -0.0017   -0.0009    0.0011   -0.0017
    0.0002   -0.0723    0.0007    0.0012   -0.0007   -0.0017   -0.0009    0.0010   -0.0018
   -0.0003   -0.0723    0.0006    0.0012   -0.0007   -0.0017   -0.0009    0.0011   -0.0017
    0.0005   -0.0723    0.0007    0.0013   -0.0007   -0.0017   -0.0009    0.0011   -0.0017

My issue is to by-pass (or not consider) the rows that start with a negative number in the first column. How can I extend this procedure if I work with cell or struct variable? How can I do it?

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Answer 1

Mischa Kim 2014-3-1

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https://ww2.mathworks.cn/matlabcentral/answers/119688-consider-only-a-positive-numbers-of-the-first-columns#answer_126667

编辑：Mischa Kim 2014-3-1

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Use

B = A(find(A(:,1)>0),:)

Concerning your second question: that, of course, depends on how your cell array looks like. In general, you could convert to a numeric array and then use the code above.

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Mischa Kim 2014-3-1

Well, as I said, it depends on how your cell array looks like. So for the one you're posting in your comment: do you want to treat the 8 different arrays as independent ones with regards to ignoring rows that start with a negative number in the first column? Or is this supposed to be one large 1000-by-72 matrix?

Francesco 2014-3-1

It's not supposed to be one marge 1000 by 72 matrix. But I would like to to the same procedure you said for each one of the 8 (or n) different arrays. As you said I want to: "treat the 8 different arrays as independent ones with regards to ignoring rows that start with a negative number in the first column"

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