ERF(3)

ERF(3) | Library Functions Manual | ERF(3)

# NAME

`erf`, `erff`, `erfl`, `erfc`, `erfcf`, `erfcl` —
error 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`() 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.

November 7, 2015 | NetBSD 9.4