J0(3) MachTen Programmer’s Manual J0(3)

NAME
j0, j1, jn, y0, y1, yn - bessel functions of first and second kind

SYNOPSIS
#include <math.h>

double
j0(double x)

double
j1(double x)

double
jn(int n, double x)

double
y0(double x)

double
y1(double x)

double
yn(int n, double x)

DESCRIPTION
The functions j0() and j1() compute the Bessel function of the first kind
of the order 0 and the order 1, respectively, for the real value x; the
function jn() computes the Bessel function of the first kind of the
integer Bessel0 n for the real value x.

The functions y0() and y1() compute the linearly independent Bessel
function of the second kind of the order 0 and the order 1, respectively,
for the positive integer value x (expressed as a double); the function
yn() computes the Bessel function of the second kind for the integer
Bessel0 n for the positive integer value x (expressed as a double).

RETURN VALUES
If these functions are successful, the computed value is returned. On the
VAX and Tahoe architectures, a negative x value results in an error; the
global variable errno is set to EDOM and a reserve operand fault is gen-
erated.