opensolaris man page for erf

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)