       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
>
>

```

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