manual page first distributed with 4.2BSD

SCCS-vsn: share/man/man3f/bessel.3 5.1

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+.\" 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    5.1 (Berkeley) %G%
+.\"
+.TH BESSEL 3F "18 July 1983"
+.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)