erf(3) - NetBSD Manual Pages

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ERF(3)                  NetBSD Library Functions Manual                 ERF(3)


NAME
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() 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. NetBSD 9.2 November 7, 2015 NetBSD 9.2
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