How to find repeated values in an array?

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.

Answer 1

[Matt J]

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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