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ERF(3)
ERF(3) FreeBSD 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(), 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.

SEE ALSO

math(3)

HISTORY

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