From WSEYMOUR@email.usps.gov Mon Feb 23 16:46:22 1998 Received: from gk-west-2.usps.gov (gk-west-2.usps.gov [198.120.14.11]) by dkuug.dk (8.6.12/8.6.12) with ESMTP id QAA10766 for ; Mon, 23 Feb 1998 16:46:18 +0100 Received: from mailgatew.usps.gov (mailgatew.usps.gov [56.224.3.225]) by gk-west-2.usps.gov (8.8.8/8.8.8) with ESMTP id HAA12984; Mon, 23 Feb 1998 07:46:15 -0800 (PST) Received: from EMAIL.USPS.GOV (email.usps.gov [56.88.9.237]) by mailgatew.usps.gov (8.8.8/8.8.8) with SMTP id HAA31764; Mon, 23 Feb 1998 07:39:58 -0800 (PST) Received: by EMAIL.USPS.GOV (Soft-Switch LMS 2.0) with snapi via SSWHUB id 0033000001829852; Mon, 23 Feb 1998 10:39:32 -0500 From: WILLIAM SEYMOUR To: " - (052)sc22wg5(a)dkuug.dk" Cc: " - (052)tydeman(a)tybor.com" , " - (052)frank(a)farance.com" Subject: Re: ULP definition Message-ID: <0033000001829852000002L022*@MHS> Date: Mon, 23 Feb 1998 10:39:32 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I've been asked as J11's V.R. whether we need to define "ULP," meaning "Unit in the Last Place", in the C standard; and I confess that I don't know the answer. (We're using the term in words that deal with floating-point accuracy.) Is this already defined in the Fortran standard? In IEC 559? (It's not in either the current or the draft ANSI dictionary.) Thanks, --Bill Seymour Programmer/Analyst, U.S. Postal Service (wseymour@email.usps.gov) Vocabulary Representative, J11 (bsey@pobox.com) ______________________________ Reply Separator ________________________= _________ Subject: ULP definition Author: tydeman@tybor.com at INTERNET Date: 2/21/98 12:55 PM Bill, As the C vocabulary rep, do any of the relavent standards define the term ULP (Unit in the Last Place)? The review committee for DR 63 (Floating-Point Accuracy) is trying to decide if we need to define ULP in the C standard, as a footnote in the C standard, or in the rationale. --- Fred J. Tydeman +1 (512) 255-8696 Tydeman Consulting 3711 Del Robles tydeman@tybor.com Programming, testing, numerics Austin, Texas 78727 Voting member of J11 (ANSI "C") USA Sample C9X+FPCE tests: ftp://jump.net/pub/tybor/ =