MirOS Manual: erf(3), erfc(3), erfcf(3), erff(3)

ERF(3)                     BSD Programmer's Manual                      ERF(3)

NAME

     erf, erff, erfc, erfcf - error function operators

LIBRARY

     libm

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() 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.

HISTORY

     The erf() and erfc() functions appeared in 4.3BSD.

MirOS BSD #10-current           April 20, 1991                               1

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