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How to remove repeating elments from a matrix?

Asked by Pushkar Satish Marathe on 3 Nov 2017
Latest activity Commented on by Cedric Wannaz
on 3 Nov 2017
I have following matrix.
A =
1 2 2 1 3
2 1 3 1 1
Where, first two columns are in principle are unique combinations. I would like to remove one column, either 1st or 2nd, and generate following matrix
B =
2 2 1 3
1 3 1 1
OR
B =
1 2 1 3
2 3 1 1
I tried using following
[G,ia,ic] = unique(A(:,1:2),'rows');
uA = A(ia,:)
but it doesn't solve the problem and gives following solution
uA =
1 2 2 1 3
2 1 3 1 1

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1 Answer

Answer by Cedric Wannaz
on 3 Nov 2017
Edited by Cedric Wannaz
on 3 Nov 2017
 Accepted Answer

Almost, the idea was correct but you were not working on the correct dimension. Also, sorting the input array vertically makes columns composed of the same elements identical regardless of their order:
>> [~, ia] = unique( sort(A, 1).', 'rows', 'stable' ) ;
>> B = A(:, ia)
B =
1 2 1 3
2 3 1 1

  2 Comments

Worked very well !! Thanks a lot :)

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