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)*intregral from 0 to x of exp(-t*t) dt
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 ALSO
erfc(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)
SunOS 5.11 12 Jul 2006 erf(3M)
