MATLAB: Identify duplicate rows in a matrix

Question

I have a matrix

A = [1 2 3; 3 4 5; 1 2 3];

I want to identify the duplicate row i.e. 3rd row and replace the values in that row by 0.

Resultant A = [1 2 3; 3 4 5; 0 0 0];

Is there an efficient way to do this? Thanks in Advance.

Answer 1

You can identify the repeated rows by invoking unique function of Matlab, and then set to 0 non-unique rows as follows:

[C,ia,ib]=unique(A,'rows','stable');
i=true(size(A,1),1);
i(ia)=false;
A(i,:)=0;

Then A will be your output.