GAMMA(2)                                                 GAMMA(2)

     NAME
          gamma - log gamma function

     SYNOPSIS
          double gamma(double x)

          int    signgam;

     DESCRIPTION
          Gamma returns ln |G(x)|.  The sign of G(x) is returned in
          the external integer signgam.

     EXAMPLES
          Computation of the gamma function:

                  errno = 0;
                  y = gamma(x);
                  if(errno || y > 88)
                          error();
                  y = signgam*exp(y);

     SEE ALSO
          intro(2)

     Page 1                       Plan 9            (printed 10/30/25)