Remove rows/columns with same elements

Hi,

Is there a easy way to remove rows with same elements in a 2D matrix. For example, i have a matrix A = [1 2; 2 3; 1 2; 3 4; 2 1]

The 'unique' command doesn't help as it will give you the output [1 2; 2 3; 3 4; 2 1]. It's not deleting the last row [2 1] which has the same element as first row.

But i want the output like this [1 2; 2 3; 3 4].

Thanks,

Asad

Answer 1

[Andrei Bobrov]

[~,i] = unique(sort(A,2),'first','rows');
out = A(i,:);

[Asad Gulib]

Thanks!!!

Answer 2

[Timo Dietz]

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

[Asad Gulib]

Thanks!!!