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ERF(3) BSD Library Functions Manual ERF(3)
NAME
erf, erfc -- error function operators
SYNOPSIS
#include <math.h>
double
erf(double x);
long double
erfl(long double x);
float
erff(float x);
double
erfc(double x);
long double
erfcl(long double x);
float
erfcf(float x);
DESCRIPTION
These functions calculate the error function of x.
The erf() function 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() computes the dif-ference difference
ference of the error function erf(x) from 1.0. This is useful, since for large x use of erfc() avoids
loss of precision due to cancellation.
SPECIAL VALUES
erf(+-_) returns +-0.
erf(+-infinity) returns +-1.
erfc(-infinity) returns 2.
erfc(+infinity) returns +0.
SEE ALSO
math(3)
STANDARDS
The erf() and erfc() functions conform to ISO/IEC 9899:1999(E).
4.3 Berkeley Distribution December 11, 2006 4.3 Berkeley Distribution
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