|J0(3)||Linux Programmer's Manual||J0(3)|
NAMEj0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl - Bessel functions of the first kind
double j0(double x );
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE
_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() etc. and j0l() etc. functions are versions that take and return float and long double values, respectively.
RETURN VALUEOn success, these functions return the appropriate Bessel value of the first kind for x.
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 nonstandard 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 3.53 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/.