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j0l (3)
J0(3) Linux Programmer's Manual J0(3)
NAME
j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl, y0, y0f, y0l, y1, y1f, y1l,
yn, ynf, ynl - 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);
float j0f(float x);
float j1f(float x);
float jnf(int n, float x);
float y0f(float x);
float y1f(float x);
float ynf(int n, float x);
long double j0l(long double x);
long double j1l(long double x);
long double jnl(int n, long double x);
long double y0l(long double x);
long double y1l(long double x);
long double ynl(int n, long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
For all of these functions: _SVID_SOURCE || _BSD_SOURCE ||
_XOPEN_SOURCE
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.
The j0f() etc. and j0l() etc. functions are versions that take and
return float and long double values, respectively.
CONFORMING TO
The functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001.
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.
2007-07-26 J0(3)
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