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problems with the eigenvalues

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Song
Song 2012-5-5
I have computed the eigenvalues of a 8*8 matrix, but I want to obtain the three largest eigenvalue of the matrix. I don't know how to do it. Can you help me with it and give me some suggestions. Thank you in advance! Regards, Song

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回答（1 个）

bym
bym 2012-5-5
eig returns the eigenvalues already sorted
[vec,val]=eig(rand(8));
diag(val)
  2 个评论
John D'Errico
John D'Errico 2012-5-5
Actually, there is no certainty that they are sorted. They will be ROUGHLY sorted because of the method used, but the exact order may vary slightly.
Walter Roberson
Walter Roberson 2012-5-5
Right, they are not necessarily sorted, and if you look through old messages you can find complaints about changes in the order. I'm not certain but I seem to recall some people indicating that they got a different order with MATLAB Compiler.

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