Arrange a matrix with repeated rows

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

[José-Luis]

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

Answer 2

[Azzi Abdelmalek]

a = [125 97;126 104;97 125;5 4;104 126;97 125;4 5];
b=cell2mat(arrayfun(@(x) sort(a(x,:)),1:size(a,1),'un',0)')
[~,idx]=sortrows(b)
out=a(idx,:)

%If you don't need it to be sorted

 b=cell2mat(arrayfun(@(x) sort(a(x,:)),1:size(a,1),'un',0)')
[c,d,e]=unique(b,'rows','stable')
[~,idx]=sort(e);
out=a(idx,:)