ERF(3) Library Functions Manual ERF(3)

NAME

erf, erff, erfl, erfc, erfcf, erfclerror 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() 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.
November 7, 2015 NetBSD 8.3