1J0(3)                      Linux Programmer's Manual                     J0(3)
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NAME

6       j0,  j0f,  j0l, j1, j1f, j1l, jn, jnf, jnl, y0, y0f, y0l, y1, y1f, y1l,
7       yn, ynf, ynl - Bessel functions
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SYNOPSIS

10       #define _GNU_SOURCE
11       #include <math.h>
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13       double j0(double x);
14       double j1(double x);
15       double jn(int n, double x);
16       double y0(double x);
17       double y1(double x);
18       double yn(int n, double x);
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20       float j0f(float x);
21       float j1f(float x);
22       float jnf(int n, float x);
23       float y0f(float x);
24       float y1f(float x);
25       float ynf(int n, float x);
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27       long double j0l(long double x);
28       long double j1l(long double x);
29       long double jnl(int n, long double x);
30       long double y0l(long double x);
31       long double y1l(long double x);
32       long double ynl(int n, long double x);
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34       Link with -lm.
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DESCRIPTION

37       The j0() and j1() functions return Bessel functions of x of  the  first
38       kind  of  orders  0 and 1, respectively.  The jn() function returns the
39       Bessel function of x of the first kind of order n.
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41       The y0() and y1() functions return Bessel functions of x of the  second
42       kind  of  orders  0 and 1, respectively.  The yn() function returns the
43       Bessel function of x of the second kind of order n.
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45       For the functions y0(), y1() and yn(), the value of x must be positive.
46       For negative values of x, these functions return -HUGE_VAL.
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48       The  j0f()  etc.  and  j0l()  etc. functions are versions that take and
49       return float and long double values, respectively.
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CONFORMING TO

52       The functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001.
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BUGS

55       There are errors of up to 2e-16 in the values returned  by  j0(),  j1()
56       and jn() for values of x between -8 and 8.
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SEE ALSO

59       feature_test_macros(7)
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63                                  2002-08-25                             J0(3)
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