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erf(3m) [bsd man page]

ERF(3M) 																   ERF(3M)

NAME
erf, erfc - error functions SYNOPSIS
#include <math.h> double erf(x) double x; double erfc(x) double x; DESCRIPTION
Erf(x) returns the error function of x; where erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt. Erfc(x) returns 1.0-erf(x). The entry for erfc is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result subtracted from 1. (e.g. for x = 10, 12 places are lost). SEE ALSO
math(3M) 4.3 Berkeley Distribution May 12, 1986 ERF(3M)

Check Out this Related Man Page

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)

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