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Eigenvalue Problem

• To: mathgroup at smc.vnet.net
• Subject: [mg16894] Eigenvalue Problem
• From: Peter Haesser <phuesser at bluewin.ch>
• Date: Mon, 5 Apr 1999 02:24:28 -0400
• Organization: Swisscom AG, the blue window
• Sender: owner-wri-mathgroup at wolfram.com

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

• Follow-Ups:
  • Re: Eigenvalue Problem
    • From: Daniel Lichtblau <danl>