GAMMA(3M)           UNIX Programmer's Manual            GAMMA(3M)

NAME
     gamma - log gamma function

SYNOPSIS
     #include <math.h>

     double gamma(x)
     double x;

DESCRIPTION
     _G_a_m_m_a returns ln |G(|_x|)|.  The sign of G(|_x|) is returned
     in the external integer _s_i_g_n_g_a_m.  The following C program
     might be used to calculate G:

          y = gamma(x);
          if (y > 88.0)
               error();
          y = exp(y);
          if(signgam)
               y = -y;

DIAGNOSTICS
     A huge value is returned for negative integer arguments.

BUGS
     There should be a positive indication of error.

Printed 5/24/83                                                 1