From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8381 invoked by alias); 14 Nov 2007 12:02:02 -0000 Received: (qmail 8342 invoked by uid 22791); 14 Nov 2007 12:02:02 -0000 X-Spam-Check-By: sourceware.org Received: from mail.phy.duke.edu (HELO mail.phy.duke.edu) (152.3.182.2) by sourceware.org (qpsmtpd/0.31) with ESMTP; Wed, 14 Nov 2007 12:02:00 +0000 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.phy.duke.edu (Postfix) with ESMTP id AD84C15014E for ; Wed, 14 Nov 2007 07:01:55 -0500 (EST) Received: from mail.phy.duke.edu ([127.0.0.1]) by localhost (mail.phy.duke.edu [127.0.0.1]) (amavisd-new, port 10026) with LMTP id lTNuXPZjUZrm for ; Wed, 14 Nov 2007 07:01:55 -0500 (EST) Received: from lilith.rgb.private.net (client212-5.dsl.intrex.net [209.42.212.5]) by mail.phy.duke.edu (Postfix) with ESMTP id 2F36B1509C3 for ; Wed, 14 Nov 2007 07:01:52 -0500 (EST) Date: Wed, 14 Nov 2007 12:02:00 -0000 From: "Robert G. Brown" To: GSL Discussion list Subject: Re: nonsymm eigenvalues... In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Mailing-List: contact gsl-discuss-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gsl-discuss-owner@sourceware.org X-SW-Source: 2007-q4/txt/msg00024.txt.bz2 On Wed, 14 Nov 2007, Robert G. Brown wrote: > Hi, I'm just starting to write a little code snippet to find eigenvalues > and vectors for a non-symmetric, real matrix and am not finding the > nonsymm functions or include files as described in the current online > manual. My current version is 1.8-1.1 (FC 6). Were these functions not > available in that release? Would upgrading help or is the problem > elsewhere (as in I'm not looking at the right place in e.g. > gsl/gsl_eigen.h)? Also, what is likely to happen if I call the symmetric routines for a nonsymmetric matrix? They seem to "work" and still produce eigenvalues and eigenvectors. Are those garbage? Sorry to ask what are probably elementary questions, but the last time I actually took a course on linear algebra or associated computational methods was something like 1976, and I don't use it much in my research. Or haven't until now...;-) rgb > > rgb > > -- Robert G. Brown Duke University Dept. of Physics, Box 90305 Durham, N.C. 27708-0305 Phone(cell): 1-919-280-8443 Web: http://www.phy.duke.edu/~rgb Lulu Bookstore: http://stores.lulu.com/store.php?fAcctID=877977