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ERF(3) Library Functions Manual ERF(3)

NAME

erf, erff, erfc, erfcf — error function operators

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
erf(double x);

float
erff(float x);

double
erfc(double x);

float
erfcf(float 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.
April 20, 1991 NetBSD 7.0
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