BESSEL(S)                XENIX System V                 BESSEL(S)



     Name
          bessel, j0, j1, jn, y0, y1, yn - Performs Bessel functions.

     Syntax
          #include <math.h>

          double j0 (x)
          double x;

          double j1 (x)
          double x;

          double jn (n, x)
          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.  The value of x must be
          positive.

          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.

     See Also
          matherr(S)

     Diagnostics
          Negative arguments cause y0, y1, and yn to return a -HUGE
          value and to set errno to EDOM.  In addition, a message
          indicating DOMAIN error is displayed on the standard error
          output.  Arguments too large in magnitude cause j0, j1, and
          y1 to return zero and to set errno to ERANGE.  In addition,
          a message indicating TLOSS error is displayed on the
          standard error output.  These error-handling procedures can
          be changed with the matherr(S) function.

     Notes
          These routines must be linked by using the -lm linker
          option.




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