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

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.

Answer 1

[madhan ravi]

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 

[IBM watson]

Thank you!!

Answer 2

[Stephen23]

"I just want to know whether there is or not."

>> any(diff(sort(a,1),1)==0,1)
ans =
  1  1  0

[madhan ravi]

+1 efficient,

any(~diff(sort(a,1),1),1)

[IBM watson]

Thanks !!