MATLAB: Is it possible to detect repeated values in a matrix?how

MATLABmatrixrepeatedsame

For example I have a matrix such;
 A=[5  13  2  7  1 8; 2  4  5  7  8  23 31;5  65  34  12  31  8]
which has a size (nx6)
If we look through first column, first and third row values are same. I just want to detect the repeated values in the 1st column in all rows. How can I do that?
Thanks

Best Answer

This can be done using hist and unqiue. See How can I count the occurrences of each element in a vector in MATLAB? for more information.
   A=[5  13  2  7  1 8; 2  4  5  7  8  23;5  65  34  12  31  8];
   % Find the unique values
   uniqueVals = unique( A(:,1) );
   % Count the number of instances of each of the unique vals
   valCount = hist( A(:,1) , uniqueVals )';
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