NAME

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

USAGE

#include <math.h>
 
double j0(x) double x;
 
double j1(x) double x;
 
double jn(n, x) double x;
 
double y0(x) double x;
 
double y1(x) double x;
 
double yn(n, x) double x;

DESCRIPTION

These functions calculate Bessel functions of the first and second kinds for real arguments and integer orders. 

DIAGNOSTICS

Negative arguments cause y0, y1, and yn to return -HUGE and set errno to EDOM.