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 the 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.

     ERRORS
          Nonpositive 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 er-
          ror output.

          Arguments too large in magnitude cause j0, j1, y0 and y1 to
          return zero and set errno to ERANGE.  In addition, a message
          indicating TLOSS error is printed on the standard error out-
          put.

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





     April, 1990                                                     1

     bessel(3M)                                             bessel(3M)



     SEE ALSO
          matherr(3M).





















































     2                                                     April, 1990