From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30237 invoked by alias); 29 Jan 2002 22:16:50 -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 30224 invoked from network); 29 Jan 2002 22:16:50 -0000 Received: from unknown (HELO po4.glue.umd.edu) (128.8.10.124) by sources.redhat.com with SMTP; 29 Jan 2002 22:16:50 -0000 Received: from y.glue.umd.edu (IDENT:root@y.glue.umd.edu [128.8.10.68]) by po4.glue.umd.edu (8.10.1/8.10.1) with ESMTP id g0TMGnC14809 for ; Tue, 29 Jan 2002 17:16:49 -0500 (EST) Received: from y.glue.umd.edu (IDENT:sendmail@localhost [127.0.0.1]) by y.glue.umd.edu (8.9.3/8.9.3) with SMTP id RAA27365 for ; Tue, 29 Jan 2002 17:16:48 -0500 (EST) Received: from localhost (negin@localhost) by y.glue.umd.edu (8.9.3/8.9.3) with ESMTP id RAA27361 for ; Tue, 29 Jan 2002 17:16:48 -0500 (EST) X-Authentication-Warning: y.glue.umd.edu: negin owned process doing -bs Date: Tue, 29 Jan 2002 14:16:00 -0000 From: Negin Nejati To: gsl-discuss@sourceware.cygnus.com Subject: Matrix inversion. Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-SW-Source: 2002-q1/txt/msg00075.txt.bz2 Message-ID: <20020129141600.F_k_OPDdIJyBsMhwVq_CGKGWu-HgVWgGBL8krkd9QVs@z> Hi, I am a new user of this library and I have a silly question: For inverting a matrix shouldn't I first use "gsl_linalg_LU_decomp" function to decompose my matrix and then use "gsl_linalg_LU_invert" passing the results of previous function to it, to invert the matrix? If it is correct how come the multiplication of the original matrix and it's reverse is not I? I'll appreciate any help, NN.