erfc(3m) [ultrix man page]

erf(3m) 																   erf(3m)

Name
       erf, erfc - error functions

Syntax
       #include <math.h>

       double erf(x)
       double x;

       double erfc(x)
       double x;

Description
       The function returns the error function of x defined as follows:
       erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.

       The function returns 1.0-erf(x).

       The entry for the function is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result sub-
       tracted from 1.	For example if x = 10, 12 places are lost.

Return Values
       The and functions return NaN when x is NaN.

See Also
       math(3m)

								       RISC								   erf(3m)

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)