NAME¶
j0, j1, jn, y0, y1, yn - Bessel functions
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
j0() and
j1() functions return Bessel functions of
x of
the first kind of orders 0 and 1, respectively. The
jn() function
returns the Bessel function of
x of the first kind of order
n.
The
y0() and
y1() functions return Bessel functions of
x of
the second kind of orders 0 and 1, respectively. The
yn() function
returns the Bessel function of
x of the second kind of order
n.
For the functions
y0(),
y1() and
yn(), the value of
x must be positive. For negative values of
x, these functions
return -HUGE_VAL.
SVID 3, BSD 4.3
BUGS¶
There are errors of up to 2e-16 in the values returned by
j0(),
j1() and
jn() for values of
x between -8 and 8.