J0(3M-SysV)         RISC/os Reference Manual          J0(3M-SysV)



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 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.

DIAGNOSTICS
     Non-positive arguments cause y0, y1 and yn to return a quiet
     NaN.

BUGS
     Arguments too large in magnitude cause j0, j1, y0 and y1 to
     return zero with no indication of the total loss of preci-
     sion.

SEE ALSO
     math(3M)








                         Printed 1/15/91                   Page 1