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Manual page for ERF(3M)

erf, erfc - error functions

SYNOPSIS

#include <math.h>

double erf(x) double x;

double erfc(x) double x;

DESCRIPTION

Erf(x) returns the error function of x; where erf(x) := (2/\(sr\(*p)\(is0xexp(-t2)dt.

Erfc(x) returns 1.0-erf(x).

The entry for erfc is provided because of the extreme loss of relative accuracy if erf(x) is called for large x and the result subtracted from 1. (e.g. for x = 10, 12 places are lost).

SEE ALSO

math(3M)

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