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

    NAME

    gamma, gammaf, gammal - (logarithm of the) gamma function
     
    

    SYNOPSIS

    #include <math.h>

    double gamma(double x);
    float gammaf(float x);
    long double gammal(long double x);

    Link with -lm.

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

    gamma(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
    gammaf(), gammal(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600  

    DESCRIPTION

    These functions are deprecated: instead, use either the tgamma(3) or the lgamma(3) functions, as appropriate.

    For the definition of the Gamma function, see tgamma(3).  

    *BSD version

    The libm in 4.4BSD and some versions of FreeBSD had a gamma() function that computes the Gamma function, as one would expect.  

    glibc version

    Glibc has a gamma() function that is equivalent to lgamma(3) and computes the natural logarithm of the Gamma function.  

    RETURN VALUE

    See lgamma(3).  

    ERRORS

    See lgamma(3).  

    CONFORMING TO

    Because of historical variations in behavior across systems, this function is not specified in any standard.  

    NOTES

     

    History

    4.2BSD had a gamma() that computed ln(|Gamma(|x|)|), leaving the sign of Gamma(|x|) in the external integer signgam. In 4.3BSD the name was changed to lgamma(3), and the man page promises

    "At some time in the future the name gamma will be rehabilitated and used for the Gamma function"

    This did indeed happen in 4.4BSD, where gamma() computes the Gamma function (with no effect on signgam). However, this came too late, and we now have tgamma(3), the "true gamma" function.  

    SEE ALSO

    lgamma(3), signgam(3), tgamma(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
    *BSD version
    glibc version
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    History
    SEE ALSO
    COLOPHON


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