How to find out whether there is a repetitive element in the columns of a matrix?

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IBM watson
IBM watson 2019-4-17
评论： IBM watson 2019-4-17
example:
a=[ 1 2 3
4 2 1
1 4 2]
Bold ones are that what I am looking for. There is no need for imformation about their indexes. I just want to know whether there is or not.
Thank you.

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采纳的回答

madhan ravi
madhan ravi 2019-4-17
Repetitions_in_columns=true(size(a,2),1);
for k = 1:size(a,2)
Repetitions_in_columns(k)=any(sum(a(:,k)==unique(a(:,k)).')>1);
end
Repetitions_in_columns % 1 means yes 0 means no each

更多回答（1 个）

Stephen23
Stephen23 2019-4-17
"I just want to know whether there is or not."
>> any(diff(sort(a,1),1)==0,1)
ans =
1 1 0

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