Symmetric Eigenvalue Problem

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Kenneth
Kenneth 2011 年 4 月 9 日
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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the cyclist
the cyclist 2011 年 4 月 9 日
"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 2011 年 4 月 9 日
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 2011 年 4 月 9 日
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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