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How to delete all repeat rows?

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Wang Jack
Wang Jack on 19 May 2020
Commented: Rik on 22 May 2020
How to delete all repeat rows?
I mean all repeat rows, like :
A=
[0 4;
2 4;
0 4;
4 8;
3 4]
How to got new_A=
[2 4;
4 8;
3 4]

Accepted Answer

Rik
Rik on 19 May 2020
Edited: Rik on 19 May 2020
There is probably a more efficient way, but you can use unique() to get all first occurrences. Then you can use the second output to find all removed rows, which you can use as an input to setdiff.
A=[0 4;2 4;0 4;4 8;3 4;0 4];
[B,ind]=unique(A,'stable','rows');
ind=setdiff(1:size(A,1),ind);
B=setdiff(B,A(ind,:),'rows');
  4 Comments
Rik
Rik on 22 May 2020
Glad to be of help. If it solved your problem, please consider marking it as accepted answer. If not, feel free to comment with your remaining issues.

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