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erff(3) [freebsd man page]

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

erf, erff, erfl, erfc, erfcf, erfcl -- error function operators LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double erf(double x); float erff(float x); long double erfl(long double x); double erfc(double x); float erfcf(float x); long double erfcl(long double x); DESCRIPTION
These functions calculate the error function of x. The erf(), erff(), and erfl() functions calculate the error function of x; where erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt. The erfc(), erfcf(), and erfcl() functions calculate the complementary error function of x; that is erfc() subtracts the result of the error function erf(x) from 1.0. SEE ALSO
math(3) HISTORY
The erf() and erfc() functions appeared in 4.3BSD. BSD
July 13, 2014 BSD

Check Out this Related Man Page

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

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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