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;

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, jn, y0, y1 and yn 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).

SEE ALSO

matherr(3M). 

Hewlett-Packard Company  —  Version B.1,  May 11, 2021