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erfc(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

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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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