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How to identify array elements that occur more than once ?

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pavan sunder
pavan sunder 2016-12-21
评论： Juan Velasquez 2021-1-28
For example D=[1 2 3 3 3 4 5 6 7 7 8]
I want to identify the elements that occur more than once.
The expected answer with respect to the above example Would be [ 3 7].
How do i do it in matlab. I can use for loop but i want to find out is there a better approach..

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回答（2 个）

KSSV
KSSV 2016-12-21
编辑：KSSV 2016-12-21
Read about unique
find(hist(D,unique(D))>1)
  1 个评论
Stephen23
Stephen23 2016-12-21
This answer does not return the values as requested, e.g.:
>> D = [2 3 3 3 4 5 6 7 7 8];
>> find(hist(D,unique(D))>1)
ans =
2 6
See my answer for the correct code.

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Stephen23
Stephen23 2016-12-21
>> U = unique(D);
>> U(1<histc(D,unique(D)))
ans =
3 7

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