Ubuntu manuals

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NAME

       lgamma - log gamma function

SYNOPSIS

       #include <math.h>

       double lgamma(double x);

DESCRIPTION

       The  lgamma()  function  returns  the  log of the absolute value of the
       Gamma function.  The sign of the Gamma  function  is  returned  in  the
       external integer signgam.

       For  negative  integer values of x, lgamma() returns HUGE_VAL and errno
       is set to ERANGE.

ERRORS

       ERANGE Invalid argument - negative integer value of x.

CONFORMING TO

       SVID 3, BSD 4.3

SEE ALSO

       infnan(3)