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diff --git a/man3/erf.3 b/man3/erf.3 new file mode 100644 index 000000000..6f7e827e8 --- /dev/null +++ b/man3/erf.3 @@ -0,0 +1,64 @@ +.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" Permission is granted to make and distribute verbatim copies of this +.\" manual provided the copyright notice and this permission notice are +.\" preserved on all copies. +.\" +.\" Permission is granted to copy and distribute modified versions of this +.\" manual under the conditions for verbatim copying, provided that the +.\" entire resulting derived work is distributed under the terms of a +.\" permission notice identical to this one. +.\" +.\" Since the Linux kernel and libraries are constantly changing, this +.\" manual page may be incorrect or out-of-date. The author(s) assume no +.\" responsibility for errors or omissions, or for damages resulting from +.\" the use of the information contained herein. The author(s) may not +.\" have taken the same level of care in the production of this manual, +.\" which is licensed free of charge, as they might when working +.\" professionally. +.\" +.\" Formatted or processed versions of this manual, if unaccompanied by +.\" the source, must acknowledge the copyright and authors of this work. +.\" +.\" References consulted: +.\" Linux libc source code +.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) +.\" 386BSD man pages +.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) +.\" Modified 2002-07-27 by Walter Harms +.\" (walter.harms@informatik.uni-oldenburg.de) +.\" +.TH ERF 3 2002-07-27 "BSD" "Linux Programmer's Manual" +.SH NAME +erf, erff, erfl, erfc, erfcf, erfcl \- error function and complementary error function +.SH SYNOPSIS +.nf +.B #include <math.h> +.sp +.BI "double erf(double " x ); +.sp +.BI "float erff(float " x ); +.sp +.BI "long double erfl(long double " x ); +.sp +.BI "double erfc(double " x ); +.sp +.BI "float erfcf(float " x ); +.sp +.BI "long double erfcl(long double " x ); +.sp +.fi +Link with \-lm. +.SH DESCRIPTION +The \fBerf()\fP function returns the error function of \fIx\fP; defined +as +.TP +erf(x) = 2/sqrt(pi)* integral from 0 to x of exp(-t*t) dt +.PP +The \fBerfc()\fP function returns the complementary error function of +\fIx\fP, that is 1.0 - erf(x). +.SH "CONFORMING TO" +SVID 3, BSD 4.3, C99. +The float and long double variants are requirements of C99. +.SH "SEE ALSO" +.BR exp (3) |