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MathGroup Archive 2003

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Re: Eigenvalues, any suggestions?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43743] Re: Eigenvalues, any suggestions?
  • From: Roland Franzius <roland.franzius at uos.de>
  • Date: Thu, 2 Oct 2003 02:52:26 -0400 (EDT)
  • Organization: Universitaet Hannover
  • References: <bkp02c$cf6$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

AC wrote:

> In[1]:=
>  data={XX\[Rule]100.,YY\[Rule]100.,ZZ\[Rule]100.,
>         XY\[Rule]0.,XZ\[Rule]0.,YZ\[Rule]0.};
> 
> In[2]:=
> Eigenvalues[{{XX,XY,XZ},{XY,YY,YZ},{XZ,YZ,ZZ}}]/.data

try

Eigenvalues[{{XX,XY,XZ},{XY,YY,YZ},{XZ,YZ,ZZ}}/.data ]

Mathematica has severe problems to distinguish the three identical roots 
in the general algebraic root expression of

Eigenvalues[{{XX,XY,XZ},{XY,YY,YZ},{XZ,YZ,ZZ}}]

without data
-- 

Roland Franzius


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