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)