Originální popis anglicky:
j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl, y0, y0f, y0l, y1, y1f, y1l, yn, ynf,
ynl - Bessel functions
Návod, kniha: Linux Programmer's Manual
#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.
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.
The functions returning double conform to SVID 3, BSD 4.3, XPG4, POSIX
1003.1-2001. The other functions are C99 requirements.
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.
