Museum

  BESSEL(3M)               (Math Libraries)              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


  Page 1                                                   May 1989

  BESSEL(3M)               (Math Libraries)              BESSEL(3M)



       Non-positive arguments cause y0, y1 and yn to return the
       value -HUGE 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
       message indicating TLOSS error is printed on the standard
       error output.

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






























  Page 2                                                   May 1989