Re: information on Eigensystem
- To: mathgroup at smc.vnet.net
- Subject: [mg33614] Re: information on Eigensystem
- From: Alois Steindl <Alois.Steindl+e325 at tuwien.ac.at>
- Date: Wed, 3 Apr 2002 18:08:19 -0500 (EST)
- Organization: Inst. f. Mechanics II, TU Vienna
- References: <a890u0$nto$1@smc.vnet.net> <a8br2m$3lg$1@smc.vnet.net> <a8e6sd$7k9$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Bettina <bho at em.uni-karlsruhe.de> writes:
> Hi
> I have another question concerning Eigensystem: I try to get the
> Eigensystem for heritian (complex) matrices. Following my test matrix
> M={{65,3+6i,12-6i,4-2i},{3-6i,30,0,30},{12+6i,0,9,3},{4+2i,30,3,46}}.
> But if I try to get Eigensystem[M] nothing comes up. What could be the
> problem? I have already found out (archive) that there seem to be some
> special effects when using Eigensystem on complex matrices, but these
> messages dated from 1999 and 2000. Has anything changed since then? Is
> there a way to solve my problem?
> Thanks for help
> Bettina
Hello,
the imaginary unit is written as capital I in Mathematica.
Even if you set i=I, Eigensystem[M] returns a very long result,
which might be of little use. If you only need the numbers, you could
try Eigensystem[N[M]].
Good luck
Alois
--
Alois Steindl, Tel.: +43 (1) 58801 / 32558
Inst. for Mechanics II, Fax.: +43 (1) 58801 / 32598
Vienna University of Technology,
A-1040 Wiedner Hauptstr. 8-10 Email: Alois.Steindl+e325 at tuwien.ac.at