Re: [eigen] GeneralizedEigenSolver eigenvalues different from lapack dggev

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I've recently applied some changes in GeneralizedEigenSolver, so it might be worth trying 3.3-beta2. Then, it could also be the case that your pair of matrices is not diagonalizable, in which case both implementation returns garbage. Finally, sharing your matrices would help to identify the issue.


On Thu, Aug 4, 2016 at 3:36 PM, Bill Greene <w.h.greene@xxxxxxxxx> wrote:
I have a simple test case with n=9 where alpha(i) and beta(i) for five eigenvalues
agree but four do not. Only one pair of three of the complex conjugate pairs agree.
For the two pair that do not agree, the alpha values are very large (i..e. 10^61).

I took a look at bug 645 and it is unclear to me if the problem I'm seeing is related
to that issue.. I'm using Eigen 3.2.9 but could certainly try 3.3-beta if appropriate..


Bill Greene

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