j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl — Bessel functions of the first kind
||long double x
||long double x
|long double x
j1() functions return Bessel functions of
x of the first kind
of orders 0 and 1, respectively. The
jn() function returns the Bessel function
x of the first
kind of order
jnf(), functions are versions that take and
return float values. The
jnl() functions are versions that take and
return long double values.
On success, these functions return the appropriate Bessel
value of the first kind for
x is a NaN, a
NaN is returned.
x is too large
in magnitude, or the result underflows, a range error occurs,
and the return value is 0.
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
The following errors can occur:
xis too large in magnitude
errno is set to
These functions do not raise exceptions for fetestexcept(3).
For an explanation of the terms used in this section, see attributes(7).
The functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001, and POSIX.1-2008. The others are nonstandard functions that also exist on the BSDs.
There are errors of up to 2e−16 in the values
for values of
between −8 and 8.
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and the latest version of this page, can be found at
Copyright 1993 David Metcalfe (davidprism.demon.co.uk)
and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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Linux libc source code
Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
386BSD man pages
Modified Sat Jul 24 19:08:17 1993 by Rik Faith (faithcs.unc.edu)
Modified 2002-08-25, aeb
Modified 2004-11-12 as per suggestion by Fabian Kreutz/AEB
2008-07-24, mtk, moved yxx() material into separate y0.3 page