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erff(3) [netbsd man page]

ERF(3)							   BSD Library Functions Manual 						    ERF(3)

erf, erff, erfc, erfcf -- error function operators LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double erf(double x); float erff(float x); double erfc(double x); float erfcf(float x); DESCRIPTION
These functions calculate the error function of x. The erf() calculates the error function of x; where erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt. The erfc() function calculates the complementary error function of x; that is erfc() subtracts the result of the error function erf(x) from 1.0. This is useful, since for large x places disappear. SEE ALSO
math(3) HISTORY
The erf() and erfc() functions appeared in 4.3BSD. BSD
April 20, 1991 BSD

Check Out this Related Man Page

erfc(3M)						  Mathematical Library Functions						  erfc(3M)

erfc, erfcf, erfcl - complementary error function SYNOPSIS
cc [ 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 5.10 1 Sep 2002 erfc(3M)
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