Symmetric Eigenvalue Problem

9 Apr 2011
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How do you calculate the symmetric eigenvalue problem in Matlab? I tried using the eig(A) and interestingly enough i get the right numbers but the signs are wrong on some of the numbers. I'm not sure what the difference really is. I was wondering if anyone had any ideas on why this might be happening. Thanks for your help!

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 Accepted Answer

the cyclist
the cyclist on 9 Apr 2011

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"eig" is definitely the correct function, and I think you can rest assured that the output is correct. Can you post a simple example that you think is wrong?

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Kenneth
Kenneth on 9 Apr 2011
Yeah I agree with you. The example problem I had must have accidentally left out a few negative signs on accident.
Walter Roberson
Walter Roberson on 9 Apr 2011
Kenneth, are *all* of the signs reversed? I skimmed a posting recently that indicated there are two different ways to write the eigenvalue problem, and that the only difference between them was to reverse all of the signs.

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