V8/usr/man/man3/erf.3

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.TH ERF 3M 
.SH NAME
erf, erfc \- error function
.SH SYNOPSIS
.B #include <math.h>
.PP
.B double erf(x)
.br
.B double x;
.PP
.B double erfc(x)
.br
.B double x;
.SH DESCRIPTION
These functions calculate the error function 
.RI erf( x )
.if n .ig
$=~(2/ sqrt pi ) int from 0 to x  roman exp (-t sup 2 ) dt$
..
and the complementary error function 
.RI erfc( x )
= 1 \-
.RI erf( x ).
The error criterion for both
.I erf
and
.I erfc
is relative.
.SH DIAGNOSTICS
There are no error returns.