bessel(3m)
NAME
j0, j1, jn, y0, y1, yn − Bessel functions
SYNTAX
#include <math.h>
double j0(x)
double x;
double j1(x)
double x;
double jn(n, x)
int n;
double x;
double y0(x)
double x;
double y1(x)
double x;
double yn(n, x)
int n;
double x;
DESCRIPTION
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 y0 and y1 functions return Bessel functions of x of the second kind of orders 0 and 1 respectively. The yn function returns the Bessel function of x of the second kind of order n. The value of x must be positive.
DIAGNOSTICS
Non-positive arguments cause y0, y1 and yn to return the value −HUGE and to set errno to EDOM. In addition, a message indicating DOMAIN error is printed on the standard error output.
Arguments too large in magnitude cause j0, j1, y0 and y1 to return zero and to set errno to ERANGE. In addition, a message indicating TLOSS error is printed on the standard error output.
These error-handling procedures may be changed with the function matherr(3m).