erf(3)erf(3)NAME
erf, erfc - Error functions
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 );
LIBRARY
Math Library (libm)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
erf(): XPG4
erfc(): XPG4
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
DESCRIPTION
The erf(), erff(), and erfl() functions return the error function of x,
where erf(x), erff(x), and erfl(x) equal (2/sqrt(pi)) times the area
under the curve e**(-t**2) between 0 and x.
The erfc(), erfcf(), and erfcl() functions return (1.0 - erf(x)). The
erfc() function can result in an underflow as x gets large.
erf(3)
