NAME

erf, erfc − error functions

SYNOPSIS

#include <math.h>

double erf(x)
double x;

double erfc(x)
double x;

DESCRIPTION

erf(x) returns the error function of x; where erf(x)=2/sqrt(pi)∗integralfrom0 erf(x):= (2/√π)∫0s0xexp(−t2)dt.

erfc(x) returns 1.0−erf(x), computed however by other methods that avoid cancellation for large x.

Sun Release 4.0  —  Last change: 20 October 1987