J0(3)

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

LIBRARY
libm

SYNOPSIS
#include <math.h>
double
j0(double x);
float
j0f(float x);
double
j1(double x);
float
j1f(float x);
double
jn(int n, double x);
float
jnf(int n, float x);
double
y0(double x);
float
y0f(float x);
double
y1(double x);
float
y1f(float x);
double
yn(int n, double x);
float
ynf(int n, float x);

DESCRIPTION
The functions j0(), j0f(), j1() and j1f() compute the Bessel function of the first kind of the order 0 and the order 1, respectively, for the real value x; the functions jn() and jnf() compute the Bessel function of the first kind of the integer order n for the real value x.

The functions y0(), y0f(), y1() and y1f() 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 functions yn() and ynf() compute the Bessel function of the second kind for the integer order n for the positive integer value x (expressed as a double).

RETURN VALUES
If these functions are successful, the computed value is returned, otherwise the global variable errno is set to EDOM and a reserve operand fault is generated.

SEE ALSO
math(3)

HISTORY
This set of functions appeared in AT&T UNIX.