BESSEL(3M)

NAME

j0, j1, jn, y0, y1, yn − Bessel functions

SYNOPSIS

#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;

HP-UX COMPATIBILITY

Level: HP-UX/RUN ONLY

Origin: System V

DESCRIPTION

J0 and j1 return Bessel functions of x of the first kind of orders 0 and 1 respectively. Jn returns the Bessel function of x of the first kind of order n.

Y0 and y1 return the Bessel functions of x of the second kind of orders 0 and 1 respectively. Yn 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. They also cause a message indicating DOMAIN error to be printed on the standard error output; the process will continue.

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).

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