# How to remove repeating elments from a matrix?

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Pushkar Satish Marathe 2017 年 11 月 3 日
コメント済み: Cedric Wannaz 2017 年 11 月 3 日
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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### 採用された回答

Cedric Wannaz 2017 年 11 月 3 日

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 件のコメント表示非表示 1 件の古いコメント
Cedric Wannaz 2017 年 11 月 3 日
My pleasure!

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