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GAMMA(3)                   Linux Programmer's Manual                  GAMMA(3)

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

       #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

       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  com-
       putes the Gamma function, as one would expect.

   glibc version
       Glibc has a gamma() function that is equivalent to lgamma(3) and computes the natu-
       ral logarithm of the Gamma function.

       See lgamma(3).

       See lgamma(3).

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

       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.

       lgamma(3), signgam(3), tgamma(3)

       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-

GNU                               2008-08-05                          GAMMA(3)

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