CentOS 5.5

GNU/Linux	CentOS 5.5
	erfc(3)

ERF

NAME

erf, erff, erfl, erfc, erfcf, erfcl − error function and complementary error function

#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);

Link with −lm.

The erf() function returns the error function of x; defined as
erf(x) = 2/sqrt(pi)* integral from 0 to x of exp(−t*t) dt

The erfc() function returns the complementary error function of x, that is 1.0 − erf(x).

SVr4, 4.3BSD, C99. The float and long double variants are requirements of C99.