erff(3) [freebsd man page]

ERF(3)							   BSD Library Functions Manual 						    ERF(3)

NAME

     erf, erff, erfl, erfc, erfcf, erfcl -- error function operators

LIBRARY

     Math Library (libm, -lm)

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

     These functions calculate the error function of x.

     The erf(), erff(), and erfl() functions calculate the error function of x; where

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

     The erfc(), erfcf(), and erfcl() functions calculate the complementary error function of x; that is erfc() subtracts the result of the error
     function erf(x) from 1.0.

SEE ALSO

     math(3)

HISTORY

     The erf() and erfc() functions appeared in 4.3BSD.

BSD
								   July 13, 2014							       BSD

erfc(3M)						  Mathematical Library Functions						  erfc(3M)

NAME

       erfc, erfcf, erfcl - complementary error function

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double erfc(double x);

       float erfcf(float x);

       long double erfcl(long double x);

DESCRIPTION

       These function compute the complementary error function 1.0 - erf(x).

RETURN VALUES

       Upon successful completion, these functions return the value of the complementary error function.

       If x is NaN, a NaN is returned.

       If x is +-0, +1 is returned.

       If x is -Inf, +2 is returned.

       If x is +Inf, 0 is returned.

ERRORS

       No errors are defined.

USAGE

       The  erfc() function is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result subtracted
       from 1.0.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       erf(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  erfc(3M)