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NAME

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

SYNOPSIS

       #include <math.h>

       double j0(double x);

       double j1(double x);

       double jn(int n, double x);

       double y0(double x);

       double y1(double x);

       double yn(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.

       For the functions y0(), y1() and yn(), the value of x must be positive.
       For negative values of x, these functions return -HUGE_VAL.

CONFORMING TO

       SVID 3, BSD 4.3

BUGS

       There are errors of up to 2e-16 in the values returned  by  j0(),  j1()
       and jn() for values of x between -8 and 8.

                                 June 26, 1993                           J0(3)