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MathGroup Archive 2004

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Re: arnoldi method with Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46041] Re: arnoldi method with Mathematica
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Tue, 3 Feb 2004 18:20:46 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <bvd8vv$5fk$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <bvd8vv$5fk$1 at smc.vnet.net>, hweekuan at yahoo.com (Hwee Kuan) 
wrote:

> I am using Mathematica v5 for computation of large non-symmetric
> tridiagonal matrices. I am trying to use the Eigenvalues[] function
> with Arnoldi method, however, I got the following errors:
> 
> Eigenvalues::arm: 
>    Method->Arnoldi can only be used for matrices of machine numbers.

Do you have to use the Arnoldi method?

  spm = SetPrecision[SparseArray[N[{{1,2,3}, {3,2,1}, {1,1,1}}]], 50]

  Eigenvalues[spm, 1]

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 9380 2734
School of Physics, M013                         Fax: +61 8 9380 1014
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Crawley WA 6009                      mailto:paul at physics.uwa.edu.au 
AUSTRALIA                            http://physics.uwa.edu.au/~paul


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