Re: Eigenvalue Problem
- To: mathgroup at smc.vnet.net
- Subject: [mg16904] Re: Eigenvalue Problem
- From: Ed McBride <emcbride at wybron.com>
- Date: Tue, 6 Apr 1999 01:27:32 -0400
- Organization: Wybron, Inc.
- References: <7e9odu$3km@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
> I am trying to solve the eigenvalue problem for the following matrix:
>
> m = {{10 A, 0, B, 0, 0, 0},
> {0, -2 A, 0, C, 0, 0},
> {B, 0, -8 A, 0, C, 0},
> {0, C, 0, -8 A, 0, B},
> {0, 0, C, 0, -2 A, 0},
> {0, 0, 0, B, 0, 10 A}}
>
> which is symmetric. Now mathematica returns some complex eigenvalues
> which is not
> possible for a real, symmetric matrix. Can anybody help me ?
I get the same phenomenon. And I also got it with a 3 x 3 I made up. I
presume the results turn out to be real if a,b,c are real, but they are
too complicated to prove this without a bunch of work. Sorry, Ed
McBride