BESSEL(3M)           INTERACTIVE UNIX System           BESSEL(3M)



          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.

               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.

          SEE ALSO
               matherr(3M).

          DIAGNOSTICS
               Non-positive arguments cause y0, y1, and yn to return the
               value -HUGE and to set errno to EDOM.  In addition, a mes-
               sage 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).



          Rev. C Software Development Set                            Page 1