Select unique couples from two vectors (?)

Hello!

I have a code I would like to perform withouth for loop, but I don't know how to describe it, so I'll show you with an example :)

I have two vectors, v1 and v2:

1  7
4  2
6  8
2  4
7  1
8  6

These vectors represent the couples: 1<>7, 4<>2, etc. The couple 1<>7 is the same as 7<>1, but each vector contains all the elements, so all the couple are repeated twice.

I would like to remove the duplicated couples, no matter about the order.

I actually do this with a for loop, but for big vectors it is very slow:

          v1f = v1(1);
          v2f = v2(1);    
          for i = 1:numel(v1)
              if isempty(intersect(v2(i), v1f))
                  v1f(i) = v1(i);
                  v2f(i) = v2(i);
              end
          end
          v1f = v1f(v1f>0);
          v2f = v2f(v2f>0);

How can I do it in a faster and nicer way? Thank you.

Answer 1

[Walter Roberson]

v = [v1, v2];
v = sort(v, 2);
[uniquerows, idx] = unique(v, 'rows');
uniquev1 = v1(idx);
uniquev2 = v2(idx);

[Alessandro Masullo]

Thank you! Maybe I should stop programming after midnight :)