How to find repeated values in an array?

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Yro
Yro 2020-12-9
回答： Matt J 2020-12-10
How can I find repeated values by columns in an array (12x2)?
A = 26 24
28 35
31 34
33 31
33 31
33 28
35 25
31 26
30 26
28 29
27 30
26 32
As can be seen, the repeated values are [33 31]. I tried to use the unique function but it only finds the unique values in a column.
[C1, ia1, ic1] = unique(A(:,1),'stable', 'rows');
Thanks in advance.

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回答（1 个）

Matt J
Matt J 2020-12-10
Ran in:
A = [26 24
28 35
31 34
33 31
33 31
33 28
35 25
31 26
30 26
28 29
27 30
26 32];
[C1, ia1, ic1] = unique(A,'stable', 'rows');
reps=C1(splitapply(@numel,ic1,ic1)>1 ,:)
reps = 1×2
33 31
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