ERF(3) | FreeBSD Library Functions Manual | ERF(3) |
NAME
erf, erff, erfl, erfc, erfcf, erfcl — error function operatorsLIBRARY
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 |