matrix transformation to make the values of second row to be lower to higher

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xueqi
xueqi 2013-10-23
评论： xueqi 2013-10-24
Hi fellows,
I have a matrix D=[p1,p1,p3;d1,d2,d3]. Now I want change the column orderings such that the second row of D is ordering from lower to higher value. For example, D=[0.3,0.5,0.2;0.3,-0.1,0.7]. What I want to is the new matrix to be [0.5,0.3,0.2;-0.1,0.3,0.7]. Do you know an efficient way to realize this?

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Wayne King
Wayne King 2013-10-23
编辑：Wayne King 2013-10-23
I'm not sure I quite understand what you're doing from your description, but
D = [0.3,0.5,0.2;0.3,-0.1,0.7];
[~,idx] = sort(D(1,:),2,'descend');
Dnew = D(:,idx);
The above gives the new matrix you want

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