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(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
SEE ALSO
math.h(3HEAD),
erfc(3M),
feclearexcept(3M),
fetestexcept(3M),
isnan(3M),
attributes(7),
standards(7)SunOS 5.11 July 12, 2006 ERF(3M)
