how to remove unique values.

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danny
danny 2013-10-3
评论： Cedric 2013-10-3
Hi,
I have a vector with some repeating values, and some unique.
e.g. A = [ 1 1 2 4 4 3 4 1 5 3]
How do i remove the unique values and get this:
ans = [1 3 4]
i.e. if there are duplicates of a value, keep one copy of that value. uniques are not wanted.
i can easily use unique to remove the duplicates but i also want to remove the values that appeared once.
Thanks,
Danny

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Cedric
Cedric 2013-10-3
编辑：Cedric 2013-10-3
Assuming that elements of A are integers greater or equal to 1, you could do something like:
>> nonUniqueValues = find( accumarray(A.', ones(size(A))) > 1 )
nonUniqueValues =
1
3
4
EDIT: we could also imagine an approach based on diff(sort(A))==0, but I prefer the approach above.
  2 个评论
danny
danny 2013-10-3
This is a fantastic solution! Many thanks for your help!

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