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Re: eigenvectors is taking lot of time

  • To: mathgroup at
  • Subject: [mg82622] Re: eigenvectors is taking lot of time
  • From: "Steve Luttrell" <steve at>
  • Date: Fri, 26 Oct 2007 05:25:29 -0400 (EDT)
  • References: <ffppmk$l0d$>

Does your matrix have symbolic or exact-valued elements? If so, then this 
would lead to very large expressions for a 30x30 matrix, especially if the 
matrix elements are symbolic. Try starting with a 2x2 matrix, and gradually 
working up in matrix size, to see what I mean.

Steve Luttrell
West Malvern, UK

<vickyisai at> wrote in message news:ffppmk$l0d$1 at
> Hi all
> I am trying to calculate eigenvectors of a 30 X 30 matrix. and
> mathematica is still just "running".
> Is the any way to get the eigenvectors quickly.
> After 45 mins ,it was still running and displayed a message "limit of
> "some number here(4096) exceeded"
> i wanted eigen values and vectors both i tried eigensystem....but
> tat also took long, so i switched to individualfunctions of
> eigenvalues and eigenvectors.
> I aborted it...shud i execute it again and wait for longer?
> I use Mathematica 5.2 and got a AMD Turion 2.2 Gz, does tat matter for
> a  30 x 30 matrix??
> Thanks
> Vick Al Aisa

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