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From: gwyn@brl-smoke.UUCP
Newsgroups: comp.lang.c
Subject: Re: math function speed
Message-ID: <5640@brl-smoke.ARPA>
Date: Wed, 18-Feb-87 15:00:39 EST
Article-I.D.: brl-smok.5640
Posted: Wed Feb 18 15:00:39 1987
Date-Received: Fri, 20-Feb-87 21:22:23 EST
References: <4943@mimsy.UUCP> <2550005@hpisod2.HP> <756@unc.unc.UUCP> <5622@brl-smoke.ARPA> <2050@ulysses.homer.nj.att.com>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Distribution: na
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 23

In article <2050@ulysses.homer.nj.att.com> ggs@ulysses.homer.nj.att.com (Griff Smith) writes:
>What's your definition of twice as accurate?

In a test where the result of "sqrt" was compared to known correct
answers, for the following arguments:

	0	1/5	1/3	1/2	1	2	e
	3	pi	4	5	9	10	16
	49	100	10000

I got the following results:

SVR2
function "sqrt":

    max abs error:	  2.7755576e-17
    max rel error:	  2.4037034e-17

4.3BSD
function "sqrt":

    max abs error:	  5.5511151e-17
    max rel error:	  3.3669215e-17