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

6       j0,  j0f,  j0l,  j1,  j1f,  j1l, jn, jnf, jnl - Bessel functions of the
7       first kind
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SYNOPSIS

10       #include <math.h>
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12       double j0(double x);
13       double j1(double x);
14       double jn(int n, double x);
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16       float j0f(float x);
17       float j1f(float x);
18       float jnf(int n, float x);
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20       long double j0l(long double x);
21       long double j1l(long double x);
22       long double jnl(int n, long double x);
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24       Link with -lm.
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26   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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28       j0(), j1(), jn():
29           _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE
30       j0f(), j0l(), j1f(), j1l(), jnf(), jnl():
31           _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600
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DESCRIPTION

34       The j0() and j1() functions return Bessel functions of x of  the  first
35       kind  of  orders  0 and 1, respectively.  The jn() function returns the
36       Bessel function of x of the first kind of order n.
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38       The j0f() etc. and j0l() etc. functions  are  versions  that  take  and
39       return float and long double values, respectively.
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RETURN VALUE

42       On  success, these functions return the appropriate Bessel value of the
43       first kind for x.
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45       If x is a NaN, a NaN is returned.
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47       If x is too large in magnitude, or the result underflows, a range error
48       occurs, and the return value is 0.
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ERRORS

51       See  math_error(7) for information on how to determine whether an error
52       has occurred when calling these functions.
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54       The following errors can occur:
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56       Range error: result underflow, or x is too large in magnitude
57              errno is set to ERANGE.
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59       These functions do not raise exceptions for fetestexcept(3).
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CONFORMING TO

62       The functions returning double conform to SVr4,  4.3BSD,  POSIX.1-2001.
63       The others are nonstandard functions that also exist on the BSDs.
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BUGS

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

70       y0(3)
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COLOPHON

73       This page is part of release 3.53 of the Linux  man-pages  project.   A
74       description  of  the project, and information about reporting bugs, can
75       be found at http://www.kernel.org/doc/man-pages/.
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79                                  2010-09-20                             J0(3)
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