# How to remove repeating elments from a matrix?

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Pushkar Satish Marathe el 3 de Nov. de 2017
Comentada: Cedric el 3 de Nov. de 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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Cedric el 3 de Nov. de 2017
Editada: Cedric el 3 de Nov. de 2017
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
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Pushkar Satish Marathe el 3 de Nov. de 2017
Worked very well !! Thanks a lot :)
Cedric el 3 de Nov. de 2017
My pleasure!

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