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
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