.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)bessel.3	6.1 (Berkeley) %G%
.\"
.TH BESSEL 3F ""
.UC 5
.SH NAME
bessel functions \- of two kinds for integer orders
.SH SYNOPSIS
.B function besj0 (x)
.sp 1
.B function besj1 (x)
.sp 1
.B function besjn (n, x)
.sp 1
.B function besy0 (x)
.sp 1
.B function besy1 (x)
.sp 1
.B function besyn (n, x)
.sp 1
.B double precision function dbesj0 (x)
.br
.B double precision x
.sp 1
.B double precision function dbesj1 (x)
.br
.B double precision x
.sp 1
.B double precision function dbesjn (n, x)
.br
.B double precision x
.sp 1
.B double precision function dbesy0 (x)
.br
.B double precision x
.sp 1
.B double precision function dbesy1 (x)
.br
.B double precision x
.sp 1
.B double precision function dbesyn (n, x)
.br
.B double precision x
.SH DESCRIPTION
These functions calculate Bessel functions of the first and second kinds
for real arguments and integer orders.
.SH DIAGNOSTICS
Negative arguments cause \fIbesy0, besy1,\fR and \fIbesyn\fR to return a huge
negative value. The system error code will be set to EDOM (33).
.SH FILES
.ie \nM /usr/ucb/lib/libF77.a
.el /usr/lib/libF77.a
.SH "SEE ALSO"
j0(3M), perror(3F)