Copyright 1993 David Metcalfe (firstname.lastname@example.org) and Copyright 2008, Linux Foundation, written by Michael Kerrisk <email@example.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting ...
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)):
j0(), j1(), jn():
- _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE
j0f(), j0l(), j1f(), j1l(), jnf(), jnl():
- _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600
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.
The j0f(), j1f(), and jnf(), functions are versions that take and return float values. The j0l(), j1l(), and jnl() functions are versions that take and return long double values.
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.
If x is too large in magnitude, or the result underflows, a range error occurs, and the return value is 0.
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).
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|j0(), j0f(), j0l()||Thread safety||MT-Safe|
|j1(), j1f(), j1l()||Thread safety||MT-Safe|
|jn(), jnf(), jnl()||Thread safety||MT-Safe|