MATLAB: How to check if points in an array are duplicates

Question

I am generating random values for rows and columns within a specified range. I put the rows and columns in an array like this: points =

     1     2
     1     2
     1     1
     2     2
so row 1 of the points array means row 1, column 2.
I need to check if any of the points are duplicates.The points array above has two duplicates. How do I do this?

Answer 1

C = unique(A,'rows') ;

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