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);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_XOPEN_SOURCE || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
_XOPEN_SOURCE >= 600 || (_ISOC99_SOURCE && _XOPEN_SOURCE) || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
On success, these functions return the appropriate Bessel value of the first kind for
x is a NaN, a NaN is returned.
x is too large in magnitude, or the result underflows, a range error occurs, and the return value is 0.
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.
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