From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 109d8a,c7637cfdf68e766 X-Google-Attributes: gid109d8a,public X-Google-Thread: f8362,c7637cfdf68e766 X-Google-Attributes: gidf8362,public X-Google-Thread: 107079,c7637cfdf68e766 X-Google-Attributes: gid107079,public X-Google-Thread: f43e6,c7637cfdf68e766 X-Google-Attributes: gidf43e6,public X-Google-Thread: 103376,c7637cfdf68e766 X-Google-Attributes: gid103376,public From: mjs@hubcap.clemson.edu (M. J. Saltzman) Subject: Re: floating point comparison Date: 1997/09/07 Message-ID: #1/1 X-Deja-AN: 270554576 References: <33EA46CC.226@pseserv3.fw.hac.com> <871377938snz@nezumi.demon.co.uk> <33FE4D83.4DCD@pseserv3.fw.hac.com> Distribution: inet Organization: Clemson University (A well-installed InterNetNews site :-) Newsgroups: comp.lang.ada,sci.math.num-analysis,comp.software-eng,comp.theory,sci.math Date: 1997-09-07T00:00:00+00:00 List-Id: eachus@spectre.mitre.org (Robert I. Eachus) writes: >But if you are inverting large matrices or solving >linear programming problems, then the real work needs to be done not >only in fixed point, but with appropriate scaling, rebuilding of >basises etc.) Why fixed point? Of course, due attention must be paid to scaling, pivoting, refactoring, tolerances, etc., but all industrial-quality LP codes that I know about use double-precision floating point for all calculations. LAPACK comes in float and double versions, but not fixed-point. It's probably one of the most widely used and respected linear algebra packages available. -- Matthew Saltzman Clemson University Math Sciences mjs@clemson.edu