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jn (3)
  • jn (3) ( FreeBSD man: Библиотечные вызовы )
  • jn (3) ( Русские man: Библиотечные вызовы )
  • >> jn (3) ( Linux man: Библиотечные вызовы )
  • jn (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

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

    SYNOPSIS

    #include <math.h>
    
    
    double j0(double x);
    double j1(double x);
    double jn(int n, double x);

    float j0f(float x);
    float j1f(float x);
    float jnf(int n, float x);

    long double j0l(long double x);
    long double j1l(long double x);
    long double jnl(int n, long double x);

    Link with -lm.

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    j0(), j1(), jn(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE
    j0f(), j0l(), j1f(), j1l(), jnf(), jnl(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600  

    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 j0f() etc. and j0l() etc. functions are versions that take and return float and long double values, respectively.  

    RETURN VALUE

    On success, these functions return the appropriate Bessel value of the first kind for x.

    If x is a NaN, a NaN is returned.

    If x is too large in magnitude, or the result underflows, a range error occurs, and the return value is 0.  

    ERRORS

    See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

    The following errors can occur:

    Range error: result underflow, or x is too large in magnitude
    errno is set to ERANGE.

    These functions do not raise exceptions for fetestexcept(3).  

    CONFORMING TO

    The functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001. The others are non-standard functions that also exist on the BSDs.  

    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.  

    SEE ALSO

    y0(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    BUGS
    SEE ALSO
    COLOPHON


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