ERF(3) Library Functions Manual ERF(3)

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

Math Library (libm, -lm)

#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);

These functions calculate the error function of x.

The () calculates the error function of x; where

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

The () 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.

math(3)

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

November 7, 2015 NetBSD 11.0