Value swapping

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Hello,
I have a matrix
x =
7 8
7 13
1 7
3 7
i want to search all 7 and shift to the first column and the corresponding value to the other coloumn, like
x =
7 8
7 13
7 1
7 3

Accepted Answer

Grzegorz Knor
Grzegorz Knor on 8 Sep 2011
x(x(:,2)==7,:) = fliplr(x(x(:,2)==7,:))
  2 Comments
Grzegorz Knor
Grzegorz Knor on 8 Sep 2011
similar solution:
x(x(:,2)==7,end:-1:1) = x(x(:,2)==7,:)

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More Answers (1)

Paulo Silva
Paulo Silva on 8 Sep 2011
x = [ 7 8
7 13
1 7
3 7]
f2=find(x(:,2)==7)+size(x,1);
f1=find(x(:,1)~=7);
tmp1=x(f1);
x(f1)=x(f2);
x(f2)=tmp1;
x
Grzegorz Knor solution seems to be better, I didn't test it.
  1 Comment
developer
developer on 8 Sep 2011
Thanks :)

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