Re: Eigenvalue Problem
- To: mathgroup at smc.vnet.net
- Subject: [mg16898] Re: Eigenvalue Problem
- From: "Kevin J. McCann" <kevin.mccann at jhuapl.edu>
- Date: Tue, 6 Apr 1999 01:27:30 -0400
- Organization: Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
- References: <7e9odu$3km@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
I don't think so. The eigenvalues look complex, but there are a lot of roots with minus signs. I plugged in some sample values for a,b,c (Note that "C" is protected, use "c"), and got real ev. Kevin Peter Huesser <phuesser at bluewin.ch> wrote in message news:7e9odu$3km at smc.vnet.net... > Hello everybody > > 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 ? Maybe the > error occurs because > mathematica means that the coefficients are complex but how can I make > them real ? > > Thank's in advance for any help. > > > Peter Huesser > >