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How to replace repeating values for each column by NaN?

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Markus Niemelä 2022-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/1676624-how-to-replace-repeating-values-for-each-column-by-nan

评论： Markus Niemelä 2022-3-24

采纳的回答： Jan

Hi!

I am a Matlab newbie, and I have a problem replacing repeating values for each column.

For example: Let's say I have matrix:

1 2 3 4

2 3 4 4

3 1 3 1

3 1 3 2

And the desired output would then be:

1 2 3 4

2 3 4 NaN

3 1 3 1

NaN NaN NaN 2

Hope this makes sense,

Kr, Markus

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采纳的回答

Jan 2022-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/1676624-how-to-replace-repeating-values-for-each-column-by-nan#answer_923224

编辑：Jan 2022-3-21

在 MATLAB Online 中打开

A = [1    2    3    4; ...
     2    3    4    4; ...
     3    1    3    1; ...
     3    1    3    2];
M    = [false(1, width(A)); diff(A, 1) == 0];
A(M) = NaN
A = 4×4
     1     2     3     4
     2     3     4   NaN
     3     1     3     1
   NaN   NaN   NaN     2

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Markus Niemelä 2022-3-24

Thanks, that seemed to work nicely!

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