How to detect and delete similar value rows in Matlab?

Question

Jelle Prins 2021-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/1463034-how-to-detect-and-delete-similar-value-rows-in-matlab

回答： Chunru 2021-9-29

Let's say I have an 4x4 matrix with values [1 to 4]:

[1 2 3 4;

1 3 4 2;

1 4 2 4;

1 3 2 2]

As you can see the first column contains 4 of the same values [1]. How can I detect rows/columns containing 4 of the same values and replace them by a value [0]?

Thanks in advance.

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Answer 1

Chunru 2021-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/1463034-how-to-detect-and-delete-similar-value-rows-in-matlab#answer_797604

A =[1 2 3 4;
    1 3 4 2;
    1 4 2 4;
    1 3 2 2];
% For columns with the same values
i = find(all(diff(A, 1)==0, 1));   % 1 for 1st dimension;  use 2 for 2nd dimension
A(:, i) =0
A = 4×4
     0     2     3     4
     0     3     4     2
     0     4     2     4
     0     3     2     2