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erfcl (3)
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.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
All functions described on this page: _BSD_SOURCE || _SVID_SOURCE ||
_XOPEN_SOURCE || _ISOC99_SOURCE; or cc -std=c99
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)
GNU 2007-07-26 ERF(3)
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