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MathGroup Archive 2007

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Eigenvalues

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77699] Eigenvalues
  • From: "amitsoni.1984 at gmail.com" <amitsoni.1984 at gmail.com>
  • Date: Fri, 15 Jun 2007 04:32:16 -0400 (EDT)

Hi,

I am using Eigenvalues[S] to find the eigenvalues of a matrix. When S
is a non singular matrix(size 500X500), the result comes very fast and
I get numerical values of the eigenvalues. When S is singular, or very
close to singular, the same command takes a very long time and I get
the solution in the following form:
------------------------------------------
(Root[1 -
685943599676205704518784329322181239368381737604683300823488051563928004
00 #1 +
422683709458129987020719509512322527334828765466847787730553472756576
3506258708383447822509137758993927488132783442108014806593541358448555767500
#1^2 -
4756334945955210795836139142803033950863408883091629073980127621488009
953862277690213957742565926625592512302479312067202413373431157721376895723657
92383917222956224461254901373715676847804396794660504978304000000
#1^3 +
149043931613976872173805300357234123824177187156376686486092172926647734083521
317893308585359969916780878974219953919649726995574191854952913882459023542023
1375808689867514677371127 ..........
-------------------------------------------------------------

How can I get the solution(eigenvalues) as numerical values?

Thank you,
Amit



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