From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 19240 invoked by alias); 26 Jan 2003 18:10:52 -0000 Mailing-List: contact gsl-discuss-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gsl-discuss-owner@sources.redhat.com Received: (qmail 19233 invoked from network); 26 Jan 2003 18:10:51 -0000 Received: from unknown (HELO viadrina.euv-frankfurt-o.de) (193.174.120.1) by 172.16.49.205 with SMTP; 26 Jan 2003 18:10:51 -0000 Received: from GRADU (ab-42125.euv-frankfurt-o.de [10.173.42.125]) by viadrina.euv-frankfurt-o.de (8.12.1/8.12.1) with SMTP id h0QIB69e000288 for ; Sun, 26 Jan 2003 19:11:06 +0100 (MET) From: Przemyslaw Sliwa To: gsl-discuss@sources.redhat.com Date: Sun, 26 Jan 2003 18:10:00 -0000 X-Priority: 3 (Normal) Reply-To: sliwa@euv-frankfurt-o.de Organization: Viadrina Message-Id: Subject: Eigenvalues MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" X-SW-Source: 2003-q1/txt/msg00071.txt.bz2 Hi people, I would like to ask all of you something. I have a matrix function, which is given by the modulus of the i-th eigenvalue of a real n*n matrix. So finally I have a matrix, which has dimension n (n*1 vector). Does anybody know how to compute the jacobian of such a matrix? I need to compute the partial derivatives of the i-th modulus with respect to the matrix. Thanks for any ideas and help Przem