erfc(3) [redhat man page]
ERF(3) Linux Programmer's Manual ERF(3) NAME
erf, erfc - error function and complementary error function SYNOPSIS
#include <math.h> double erf(double x); double erfc(double x); DESCRIPTION
The erf() function returns the error function of x; defined as erf(x) = 2/sqrt(pi)* integral from 0 to x of exp(-t*t) dt The erfc() function returns the complementary error function of x, that is 1.0 - erf(x). CONFORMING TO
SVID 3, BSD 4.3 SEE ALSO
exp(3) BSD
1993-06-25 ERF(3)
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erfc(3M) Mathematical Library Functions erfc(3M) NAME
erfc, erfcf, erfcl - complementary error function SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double erfc(double x); float erfcf(float x); long double erfcl(long double x); DESCRIPTION
These function compute the complementary error function 1.0 - erf(x). RETURN VALUES
Upon successful completion, these functions return the value of the complementary error function. If x is NaN, a NaN is returned. If x is +-0, +1 is returned. If x is -Inf, +2 is returned. If x is +Inf, 0 is returned. ERRORS
No errors are defined. USAGE
The erfc() function is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result subtracted from 1.0. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
erf(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 erfc(3M)