128 lines
3.2 KiB
Groff
128 lines
3.2 KiB
Groff
.\" Copyright (c) 1985, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)j0.3 6.7 (Berkeley) 4/19/91
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.\"
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.Dd April 19, 1991
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.Dt J0 3
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.Os BSD 4
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.Sh NAME
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.Nm j0 ,
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.Nm j1 ,
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.Nm jn ,
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.Nm y0 ,
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.Nm y1 ,
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.Nm yn
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.Nd bessel functions of first and second kind
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.Sh SYNOPSIS
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.Fd #include <math.h>
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.Ft double
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.Fn j0 "double x"
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.Ft double
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.Fn j1 "double x"
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.Ft double
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.Fn jn "int n" "double x"
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.Ft double
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.Fn y0 "double x"
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.Ft double
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.Fn y1 "double x"
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.Ft double
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.Fn yn "int n" "double x"
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.Sh DESCRIPTION
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The functions
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.Fn j0
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and
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.Fn j1
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compute the
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.Em Bessel function of the first kind of the order
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0 and the
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.Em order
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1, respectively,
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for the
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real value
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.Fa x ;
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the function
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.Fn jn
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computes the
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.Em Bessel function of the first kind of the integer order
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.Fa n
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for the real value
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.Fa x .
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.Pp
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The functions
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.Fn y0
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and
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.Fn y1
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compute the linearly independent
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.Em Bessel function of the second kind of the order
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0 and the
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.Em order
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1, respectively,
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for the
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postive
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.Em integer
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value
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.Fa x
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(expressed as a double);
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the function
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.Fn yn
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computes the
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.Em Bessel function of the second kind for the integer order
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.Fa n
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for the postive
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.Em integer
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value
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.Fa x
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(expressed as a double).
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.Sh RETURN VALUES
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If these functions are successful,
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the computed value is returned. On the
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.Tn VAX
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and
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.Tn Tahoe
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architectures,
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a negative
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.Fa x
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value
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results in an error; the global
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variable
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.Va errno
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is set to
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.Er EDOM
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and a reserve operand fault is generated.
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.Sh SEE ALSO
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.Xr math 3 ,
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.Xr infnan 3
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.Sh HISTORY
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A set of these functions
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function appeared in
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.At v7 .
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