Quick method to find duplicates in a matrix?

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Dan
Dan 2014-7-16
评论： Dan 2014-7-16
Hi guys,
Does anybody know a quick way of checking to see which elements of a matrix are duplicates?
Such as:
a = [1,2,3,4,5,5,1,6,7];
Can we have matlab return the indices of all 1's and 5's or return: 1, 5
Thanks!

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采纳的回答

Joseph Cheng
Joseph Cheng 2014-7-16
编辑：Joseph Cheng 2014-7-16
You can try:
[uniqueA i j] = unique(A,'first');
indexToDupes = find(not(ismember(1:numel(A),i)))
There may be some parameters in the unique() function to get exactly what you desire but i don't remember it off hand.

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-7-16
编辑：Azzi Abdelmalek 2014-7-16
a = [1,2,3,4,5,5,1,6,9];
[ii,jj,kk]=unique(a)
out=ii(histc(kk,1:numel(ii))>1)

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