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)