BESSEL(3M)               DOMAIN/IX SYS5                BESSEL(3M)



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)
     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
     If given a non-positive argument, y0, y1 and yn return the
     value -HUGE, set errno to EDOM, and print a message indicat-
     ing a DOMAIN error on the standard error output.

     Arguments too large in magnitude cause j0, j1, y0 and y1 to
     return zero, set errno to ERANGE, and print a message indi-
     cating a TLOSS error on the standard error output.

     These error-handling procedures may be changed using the
     function matherr(3M).






Printed 12/4/86                                          BESSEL-1

BESSEL(3M)               DOMAIN/IX SYS5                BESSEL(3M)



NOTE
     User programs that call this routine but do not link with
     libm.a will, instead, reference an older routine included in
     /lib/clib.  Support for the old (in clib) routines will be
     discontinued in a future release.  See intro(3M).

RELATED INFORMATION
     matherr(3M)













































BESSEL-2                                          Printed 12/4/86