Syntax

#include <math.h> /* SAA extension to ANSI */
double gamma(double x);

gamma computes the natural logarithm of the absolute value of G(x) (ln(|G(x)|)), where



Portability Note According to the SAA standard, x must be a positive real value. Under The Developer's Toolkit compiler, x can also be a negative integer.

gamma returns the value of ln(|G(x)|). If x is a negative value, errno is set to EDOM. If the result causes an overflow, gamma returns HUGE_VAL and sets errno to ERANGE.

This example uses gamma to calculate ln(|G(x)|), where x = 42.

#include <math.h>
#include <stdio.h>

int main(void)
{
   double x = 42,g_at_x;

   g_at_x = exp(gamma(x));                       /* g_at_x = 3.345253e+49     */
   printf("The value of G(%4.2f) is %7.2e\n", x, g_at_x);
   return 0;

   /****************************************************************************
      The output should be:

      The value of G(42.00) is 3.35e+49
   ****************************************************************************/
}

• bessel
  
• erf - erfc

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