MATLAB: Arrange a matrix with repeated rows

Question

Hi,experts

I have a raw matrix as:

a = [125    97
   126   104
    97   125
   104   126];

I'm looking for an algorithm to manipulate this matrix with an output as:

    a = [125    97
        97   125
       126   104      
       104   126];

just I want to put repeated row together. This is a small piece of a large matrix, but the structure is the same.

Thank you Kyle

Answer 1

 [idx idx] = sortrows(sort(a,2));
 a = a(idx,:);