erfc

ERF(3)			  Linux Programmer’s Manual		       ERF(3)



NAME
       erf, erff, erfl, erfc, erfcf, erfcl - error function and complementary
       error function

SYNOPSIS
       #include <math.h>

       double erf(double x);

       float erff(float x);

       long double erfl(long double x);

       double erfc(double x);

       float erfcf(float x);

       long double erfcl(long double x);


DESCRIPTION
       The erf() function returns the error function of x; defined as

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

       The erfc() function returns the complementary  error  function  of  x,
       that is 1.0 - erf(x).

CONFORMING TO
       SVID 3, BSD 4.3, C99.  The float and long double variants are require-
       ments of C99.

SEE ALSO
       exp(3)



BSD				  2002-07-27			       ERF(3)