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erfc(3m) [ultrix man page]

erf(3m) 																   erf(3m)

       erf, erfc - error functions

       #include <math.h>

       double erf(x)
       double x;

       double erfc(x)
       double x;

       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

								       RISC								   erf(3m)

Check Out this Related Man Page

erf(3M) 						  Mathematical Library Functions						   erf(3M)

erf, erff, erfl - error function SYNOPSIS
cc [ 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() * 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 5.10 1 Nov 2003 erf(3M)
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