J0
Section: Linux Programmer's Manual (3)
Updated: 20100920
Index
Return to Main Contents
NAME
j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl 
Bessel functions of the first kind
SYNOPSIS
#include <math.h>
double j0(double x);
double j1(double x);
double jn(int n, double x);
float j0f(float x);
float j1f(float x);
float jnf(int n, float x);
long double j0l(long double x);
long double j1l(long double x);
long double jnl(int n, long double x);
Link with lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
j0(),
j1(),
jn():

_SVID_SOURCE  _BSD_SOURCE  _XOPEN_SOURCE
j0f(),
j0l(),
j1f(),
j1l(),
jnf(),
jnl():

_SVID_SOURCE  _BSD_SOURCE  _XOPEN_SOURCE >= 600
DESCRIPTION
The
j0()
and
j1()
functions return Bessel functions of
x
of the first kind of orders 0 and 1, respectively.
The
jn()
function
returns the Bessel function of
x
of the first kind of order
n.
The
j0f()
etc. and
j0l()
etc. functions are versions that take and return
float
and
long double
values, respectively.
RETURN VALUE
On success, these functions return the appropriate
Bessel value of the first kind for
x.
If
x
is a NaN, a NaN is returned.
If
x
is too large in magnitude,
or the result underflows,
a range error occurs,
and the return value is 0.
ERRORS
See
math_error(7)
for information on how to determine whether an error has occurred
when calling these functions.
The following errors can occur:
 Range error: result underflow, or x is too large in magnitude

errno
is set to
ERANGE.
These functions do not raise exceptions for
fetestexcept(3).
CONFORMING TO
The functions returning
double
conform to SVr4, 4.3BSD,
POSIX.12001.
The others are nonstandard functions that also exist on the BSDs.
BUGS
There are errors of up to 2e16 in the values returned by
j0(),
j1()
and
jn()
for values of
x
between 8 and 8.
SEE ALSO
y0(3)
COLOPHON
This page is part of release 3.54 of the Linux
manpages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/manpages/.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 RETURN VALUE

 ERRORS

 CONFORMING TO

 BUGS

 SEE ALSO

 COLOPHON

This document was created by
man2html,
using the manual pages.
Time: 10:06:53 GMT, January 22, 2018