LGAMMA(3)

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  func-
       tion 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)