How to change values meeting certain criteria to NaN... in certain columns only

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Corymbiamaculata 2019-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/447428-how-to-change-values-meeting-certain-criteria-to-nan-in-certain-columns-only

评论： Corymbiamaculata 2019-2-28

I have a large matrix with 96 columns and thousands of rows. I would like to find all values values larger than 100 in even-numbered columns (2, 4, 6...) and replace them with NaN.

I know of:

A(A(:,2)>100,2) = NaN;

How can I make it work with multiple columns (:,2:2:end)?

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madhan ravi 2019-2-28

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编辑：madhan ravi 2019-2-28

在 MATLAB Online 中打开

B=A(:,2:2:end);
idx=B>100;
B(idx)=NaN;
A(:,2:2:end)=B

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Corymbiamaculata 2019-2-28

Thanks! I should have thought of that.

PS The avatars :)

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MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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