How to remove redundant rows in a matrix

Suppose a matrix

1 2
3 4
5 6
3 4
5 7
4 3

row 2, 4, 6 are redundant, so how can I just leave either of them, then the matrix writes

1 2
3 4
5 6
5 7

The actual matrix is quite large, so I will need an automatic routine. Thank you for all suggestions.

Answer 1

[Guillaume]

If the order of the elements in a row does not matter (i.e row 6 == row 4):

unique(sort(m, 2), 'rows')

is what you want. If it does, it's just:

unique(m, 'rows')