erf(3M) Mathematical Library Functions erf(3M)NAME
erf, erff, erfl - error function
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double erf(double x);
float erff(float x);
long double erfl(long double x);
DESCRIPTION
These functions compute the error function of their argument x, defined
as:
2/sqrt(pi)\(**\|integral from 0 to x of exp(\-t\(**t) dt
Equation that computes error function of x.
RETURN VALUES
Upon successful completion, these functions return the value of the
error function.
If x is NaN, a NaN is returned.
If x is ±0, ±0 is returned.
If x is ±Inf, ±1 is returned.
If x is subnormal, 2/sqrt(pi) * 2 is returned.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOerfc(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M),
math.h(3HEAD), attributes(5), standards(5)SunOS 5.10 12 Jul 2006 erf(3M)
