BESSEL(3M)                           SysV                           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_VAL
     or NaN 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, jn, y0 and y1 to return
     zero and to set errno to ERANGE.  If x is NaN, NaN is returned.  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).