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Re: Question: how does mathematica determine the coefficient of the

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84890] Re: Question: how does mathematica determine the coefficient of the
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 18 Jan 2008 05:46:17 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <fmng23$377$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

because if v is an eigenvector also a*v with
any scalar value a is an eigenvector and this mean
you can use what you like and Mathematica don't like
-1, it likes 1 ..

Regards
   Jens
gogoant06 at yahoo.com.hk wrote:
> For an example:
> 
> Input:
> test = {{1, 2}, {2, 1}};
> Eigensystem[test]
> 
> Output:
> {{3, -1}, {{1, 1}, {-1, 1}}}
> 
> Why aren't the eigenvectors be {-1,-1}, {1,-1}...?
> Is there some rule for mathematica to choose out the eigenvectors?
> 


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