HP 3000 Manuals HP 3000 Manuals
Bessel Functions
The Bessel functions are j0, j1, jn, y0, y1, and yn.
Syntax
#include <math.h>
double j0 (double x);
double j1 (double x);
double jn (int i, double x);
double y0 (double x);
double y1 (double x);
double yn (int i, double x);
Parameters
x A real number input to the Bessel functions.
i An integer value indicating the order to use when
calculating the Bessel functions.
Return Values
n The result of the Bessel function.
-HUGE The input arguments are non-positive.
0 The input argument is too large in magnitude. In addtion,
errno is set to ERANGE.
Description
The j0 and j1 functions return Bessel functions of x of the first kind of
orders zero and 1, respectively. The jn function returns the Bessel
function of x of the first kind of order i.
The y0 and y1 functions return the Bessel functions of x of the second
kind of orders zero and 1, respectively. The yn function returns the
Bessel function of x of the second kind of order i. The value of x must
be positive.
Non-positive arguments cause y0, y1, and yn to return the value -HUGE and
sets errno to EDOM. They also cause a message indicating a DOMAIN error
to be printed on the standard error output, but the process continues.
Arguments too large in magnitude cause j0, j1, jn, y0, y1 and yn to
return zero and to set errno to ERANGE. In addition, a message indicating
TLOSS error is printed on the standard error output.
Error handling can be changed by a user-written matherr function.
See Also
matherr()