/* nag_polygamma_fun (s14acc) Example Program.
 *
 * Copyright 2002 Numerical Algorithms Group.
 *
 * Mark 7, 2002.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nags.h>

int main(void)
{
  double f, x;

  /* Skip heading in data file */
  Vscanf("%*[^\n]");
  Vprintf("nag_polygamma_fun (s14acc) Example Program Results\n");
  Vprintf("     x       psi(x)-log(x)\n");
  while (scanf("%lf", &x) != EOF)
    {
      /* nag_polygamma_fun (s14acc).
       * psi(x)~-~ln~x
       */
      f = nag_polygamma_fun(x, NAGERR_DEFAULT);
      Vprintf("%8.3f %14.4f\n", x, f);
    }
  return EXIT_SUCCESS;
}