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How can put eigenvalues in ascending order?

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Anderson
Anderson 2014-9-29
编辑： Matt J 2014-9-29
Hi,
I am using something like [V,D] = eig(S) and I would like the eigenvalues in ascending order in the diagonal. V, D and S are 2x2 matrices.
Thanks.

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回答（1 个）

Matt J
Matt J 2014-9-29
[~,idx]=sort(diag(D));
D=D(idx,idx);
  2 个评论
Anderson
Anderson 2014-9-29
Thank you for your reply.
I tried this but I got the eigenvalues not in the diagonal. Is it right?
Dt1 =
0 -0.5782
0.6702 0
Matt J
Matt J 2014-9-29
编辑：Matt J 2014-9-29
D(idx,idx) not D(idx,:)

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