.TH ERF 2
.SH NAME
erf, erfc \- error function
.SH SYNOPSIS
.B double erf(double x)
.PP
.B double erfc(double x)
.SH DESCRIPTION
These functions calculate the error function
.RI erf( x )
and the complementary error function
.RI erfc( x ).
The error criterion for both
.I erf
and
.I erfc
is relative.
.SH DIAGNOSTICS
There are no error returns.