ERF(3) MachTen Programmer’s 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() 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.

SEE ALSO
math(3)

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

4.3 Berkeley Distribution June 4, 1993 1