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AT&T UNIX™PC Unix System V Users Manual - tenox

AT&T UNIX™PC Unix System V Users Manual - tenox

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ERF (3M) ERF (3M)<br />

NAME<br />

erf1 erfc - error function and complementary error function<br />

SYNOPSIS<br />

#include <br />

double err (x)<br />

double x;<br />

double erfc (x)<br />

double x;<br />

DESCRIPTION<br />

:r<br />

Erf returns the error function of x 1 defined as � J e -t2 dt.<br />

vrr o<br />

Erfc 1 which returns 1.0 - erf{ x) 1 is provided because of the<br />

extreme loss of relative accuracy if erf{x) is called for large x and<br />

the result subtracted from 1.0 (e.g. for x = 51 12 places are lost).<br />

SEE ALSO<br />

exp(3M).<br />

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