Re: Diagonalize sparse matrix and documentation in version 6.
- To: mathgroup at smc.vnet.net
- Subject: [mg92257] Re: Diagonalize sparse matrix and documentation in version 6.
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Wed, 24 Sep 2008 03:33:27 -0400 (EDT)
- Organization: Uni Leipzig
- References: <gbake6$12a$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi, you "However, I found no mention of these options in the documentation " ??? Hmm .. Open the Help-Notebook for Eigensystem[] amd look into the "Possible Issues" section and ... what is the last example ?? {vals, vecs} = Eigensystem[s, 3, Method -> {"Arnoldi", Shift -> -4}]; And if you type in Eigensystem[{{1, 0}, {0, 1}}, Method -> "foo"] what does Mathematica say Eigensystem::emeth: "The method specified by Method -> "foo" should be either Automatic or Arnoldi. " Regards Jens Thibaut Jonckheere wrote: > Dear Group, > > I am currently writing code involving the diagonalization of large > sparse matrix. With a little research, I found this post on the group: > http://groups.google.com/group/comp.soft-sys.math.mathematica/browse_thread/thread/04e12cc442615ff1 > explaining some very useful options (like Method -> {Arnoldi, > MaxIterations -> 10^5, > Criteria -> RealPart}). > However, I found no mention of these options in the documentation > center of my Mathematica v6. The best I could find is this page on > Wolfram site: > http://documents.wolfram.com/v5/Built-inFunctions/AdvancedDocumentation/LinearAlgebra/4.4.html > but the page is for version 5.0 and called obsolete. I could not find an > equivalent page for version 6. Am I missing something, or are these > options for eigensystems not documented in version 6.0 ? > > > Thanks for any help, > > > Thibaut Jonckheere > > > >
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