[eigen] GeneralizedEigenSolver eigenvalues different from lapack dggev |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: [eigen] GeneralizedEigenSolver eigenvalues different from lapack dggev*From*: Bill Greene <w.h.greene@xxxxxxxxx>*Date*: Thu, 4 Aug 2016 09:36:32 -0400*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to; bh=ja3vZf2XDmFsSWLZnqfRoMaMWnQH193EKU9T6mFggew=; b=X2+jF+2vzQAmSfIycZYrBzEGgl0wWZrRULDFcoyVkXjKgyFbSNFVmI85SlJpI9mAk+ owRloSCAdog9BoZr84eCD3kphuexrIpzUrgyVci9km7bMRAmSf0Fxav6YZGsSB+A9xkO zUciq6KuyVZ8NRXJ/8zHnMv5OAPqTzcQ4iAJ8CBWkb2jLpv7gaxV1lJb5sfVYSg8yE4Z TrojpUM6ZlWy5xPdM+4b0LpuQKsaTQH+M+PeZjLT619zCI/A15HoBHnNAZm8d53mBO3z Sk+nW8fNbVZT2kMaJeFI8tk6/4kZylt4DRRYktn39XE/fDZc7MH/kZ/Kf0DSXlWLAbW8 hE0Q==

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.

Thanks.

Bill Greene

**Follow-Ups**:**Re: [eigen] GeneralizedEigenSolver eigenvalues different from lapack dggev***From:*Gael Guennebaud

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