ERF(3) BSD Library Functions Manual ERF(3)
NAME
erf, erfc -- error function operators
SYNOPSIS
#include <math.h>
double
erf(double x);
double
erfc(double x);
DESCRIPTION
These functions calculate the error function of x.
The erf() function calculates the error function of x; where
erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.
The erfc() function calculates the complementary error function of x; that is erfc() subtracts the result of the error function erf(x) from
1.0. This is useful, since for large x places disappear.
SPECIAL VALUES
erf(+-0) returns +-0.
erf(+-infinity) returns +-1.
erfc(-infinity) returns 2.
erfc(+infinity) returns +0.
SEE ALSO
math(3)
STANDARDS
The erf() and erfc() functions conform to ISO/IEC 9899:1999(E).
4.3 Berkeley Distribution January 30, 2003 4.3 Berkeley Distribution
