ultrix man page for signgam

gamma(3m)																 gamma(3m)

Name
       gamma, lgamma, signgam - log gamma function

Syntax
       #include <math.h>

       double gamma(x)
       double x;

       double lgamma(x)
       double x;

       extern int

Description			 _			_
       The fu_ction returns ln || (|x|)|.  The sign of | (|x|) is returned in the external integer The following C program might be used to calcu-
       late | :

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

       The function is another name for the function.

Return Values
       The and functions return NaN when x is NaN or when it is an integer value less than or equal to zero.  On  overflow  and  functions  return
       HUGE_VAL.

Environment
       When your program is compiled using the System V environment for nonpositive integer values, HUGE is returned, and errno is set to EDOM.  A
       message indicating DOMAIN error is printed on the standard error output.

       If the correct value would overflow, returns HUGE and sets errno to ERANGE.

       These error-handling procedures may be changed with the function

See Also
       matherr(3m)

								       RISC								 gamma(3m)