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J0(3) Linux Programmer's Manual J0(3)
j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl - Bessel functions of the first kind
#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
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.
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.
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).
The functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001. The
others are nonstandard functions that also exist on the BSDs.
There are errors of up to 2e-16 in the values returned by j0(), j1() and jn()
for values of x between -8 and 8.
y0(3)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
2010-09-20 J0(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface