J0Section: Linux Programmer's Manual (3)
Index Return to Main Contents
NAMEj0, 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)):
DESCRIPTIONThe 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.
RETURN VALUEOn success, these functions return the appropriate Bessel value of the first kind for x.
If x is a NaN, a NaN is returned.
ERRORSSee 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 TOThe functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001. The others are non-standard functions that also exist on the BSDs.
BUGSThere are errors of up to 2e-16 in the values returned by j0(), j1() and jn() for values of x between -8 and 8.
COLOPHONThis page is part of release 3.21 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/.