ERF(3) Linux Programmer s Manual ERF(3)

NAME erf, erff, erfl, erfc, erfcf, erfcl - error function and complementary error function

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);

Link with -lm.

DESCRIPTION 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).

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

SEE ALSO cerf(3), exp(3)

BSD 2002-07-27 ERF(3)