bessel(3M)                                             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;

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 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_VAL and to set errno to EDOM. In addition, a
     message indicating DOMAIN error is printed on the standard
     error output.

     Arguments too large in magnitude cause j0, j1, y0 and y1 to
     return zero and to set errno to ERANGE.  In addition, a mes-
     sage 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).



Page 1                        CX/UX Programmer's Reference Manual