DragonFly On-Line Manual Pages


ERF(3)		      DragonFly Library Functions Manual		ERF(3)

NAME

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() and the erff() 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() and the erfcf() functions calculate 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. DragonFly 4.1 April 20, 1991 DragonFly 4.1