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Man Pages
ERF(3) FreeBSD 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 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.

math(3)

The erf() and erfc() functions appeared in 4.3BSD.
July 13, 2014 FreeBSD 13.1-RELEASE

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