NAME

bessel: 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.

j0 and y1 return Bessel functions of x of the second kind of orders 0 and 1 respectively.  jn 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 −Infinity . 

Arguments too large in magnitude cause j0, j1, y0 and y1 to return zero. 

September 02, 1992