how can i find identical rows in a matrix

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AA 2015-3-21

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评论： AA 2015-3-21

采纳的回答： Konstantinos Sofos

I have a 158x7 matrix. I want to find if there is at least one row which is identical.

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Geoff Hayes 2015-3-21

AA - please describe what you mean by similar. Do you meant that the two rows are identical or share the same values or share a pattern of numbers? Be clear about what the problem is you are trying to solve. Use the question body to include more than just a repeat of your question header.

AA 2015-3-21

ok i changed the question. thanks for the advice

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Answer 1

Konstantinos Sofos 2015-3-21

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编辑：Konstantinos Sofos 2015-3-21

在 MATLAB Online 中打开

Use unique() to find the distinct row values. If you end up with fewer rows, there are duplicates. It'll also give you indexes of one location of each of the distinct values. All the other row indexes are your duplicates.

x = [
    1 1
    2 2
    3 3
    4 4
    2 2
    3 3
    3 3
    ];
[u,I,J] = unique(x, 'rows', 'first')
hasDuplicates = size(u,1) < size(x,1)
ixDupRows = setdiff(1:size(x,1), I)
dupRowValues = x(ixDupRows,:)