ERF(3M)                              BSD                               ERF(3M)



NAME
     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/sqrt(pi)*integral from 0 to x of exp(-t*t) 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.  (for example, for x = 10, 12 places are lost).

SEE ALSO
     math(3M)