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Remove rows/columns with same elements

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Asad Gulib
Asad Gulib on 17 Nov 2020
Commented: Asad Gulib on 17 Nov 2020
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

Accepted Answer

Andrei Bobrov
Andrei Bobrov on 17 Nov 2020
[~,i] = unique(sort(A,2),'first','rows');
out = A(i,:);

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