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(), j1f(), and jnf(), functions are versions that take and
return float values. The j0l(), j1l(), and jnl() functions are ver-
sions that take and return long double values.
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,
and POSIX.1-2008. 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.
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