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Length: 804 (0x324)
Types: TextFile
Notes: UNIX file
Names: »erf.3m«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/man/man3/erf.3m«
.ig
@(#)erf.3m 2.1 7/1/84
@(#)Copyright (C) 1984 by National Semiconductor Corp.
..
.\" man page must be processed by eqn
.EQ
delim $$
.EN
.TH ERF 3M
.SH NAME
erf - C program for floating point error function
.SH SYNOPSIS
.PP
.nf
.B #include <math.h>
.B double erf(x)
.B double x;
.B double erfc(x)
.B double x;
.fi
.SH DESCRIPTION
.PP
erf(x) returns the error function of its argument
.br
erfc(x) returns 1.0-erf(x)
.PP
erf(x) is defined by
${2 over sqrt(pi)} int from 0 to x e sup {-t sup 2} dt$
.PP
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. (e.g. for x= 10, 12 places are lost).
.PP
There are no error returns.
.PP
Calls exp.
.PP
Coefficients for large x are #5667 from Hart & Cheney (18.72D).