# 2.11BSD#431 - /usr/man/cat3/erf.0

    ERF(3M)             UNIX Programmer's Manual		  ERF(3M)

    NAME
         erf, erfc - error functions

    SYNOPSIS
         #include <math.h>

         double erf(x)
         double x;

         double erfc(x)
         double x;

    DESCRIPTION
         Erf(x) returns the error function of x; where

         erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.

         Erfc(x) returns 1.0-erf(x).

         The entry for erfc is provided because of the extreme loss
         of relative accuracy if erf(x) is called for large x and the
         result subtracted from 1.	(e.g. for x = 10, 12 places are
         lost).

    SEE ALSO
         math(3M)

    Printed 11/26/99	  May 12, 1986				1

Generated: 2016-12-26 | Generated by man2html V0.25 page hit count: 265 |