Path: utzoo!mnetor!lazer
From: lazer@mnetor.UUCP (Lazer Danzinger)
Newsgroups: comp.lang.c
Subject: Epsilon Function; source wanted
Message-ID: <5085@mnetor.UUCP>
Date: 14 Sep 89 13:31:16 GMT
Organization: Motorola Computer X
Lines: 29


 
     If anyone has code for a function written in 'C' that returns the epsilon
     of its (double) parameter, I would be really appreciative.
 
     This function is commonly available under Basic as an instrinsic
     function. Its definition is something like this:
 
     double eps(x)
     double x;
     {
	 return Max(Max(x'-x, x-x"), epsilon);
      }
 
     where x' is the successor of x, and x" is the predecessor of x, and
     espilon is the smallest number representable by the computer, eg.
     MINDOUBLE (in values.h), or DBL_MIN (in float.h, under ANSI).
 
     Thanks in advance.
 
-- 
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Lazer Danzinger      | "Ben Zoma said, 'Who is wise?  One who learns from 
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