Re: Fast solution to very small eigenvalue problem

From: Mark Mackey (markm_at_chiark.greenend.org.uk)
Date: 07/02/04 

Date: 02 Jul 2004 18:12:10 +0100 (BST)

In article <cbh1r8$sjj$1@fb04373.mathematik.tu-darmstadt.de>,
Peter Spellucci <nospamspellucci@fb04373.mathematik.tu-darmstadt.de> wrote:
>even simpler and seemingly more efficient would be to derive the charactristic
>polynomial of T formally (this gives a simple recursion) and plugging this into
>a direct solver fro fourth degree polynomials (see http://www,netlib.org/toms)
>but I discourage this because of possible severe problems with roundoff, whereas
>the above one would be perfectly numerically stable

Thanks muchly for the above. 

-- 
Mark Mackey   http://www.swallowtail.org/
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