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