find the repetition of matrix rows

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yousef Yousef 2014-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/128893-find-the-repetition-of-matrix-rows

评论： yousef Yousef 2014-5-8

I want to find out if the row i of mxn matrix is repeated ,the code should give logic 1.Otherwise zero"there are many ways but Im searching for the best one" Thanks

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the cyclist 2014-5-8

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Using the algorithm that Jan Simon posted in this Answer.

% Example of data
X = [6 5 4;
     1 2 3;
     1 2 3; 
     1 2 4;
     1 2 3];
[~,~,A] = unique(X,'rows','stable');
[n, bin] = histc(A, unique(A));
multiple = find(n > 1);
indexToDuplicate = ismember(bin, multiple);