/* 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)
{
  Integer  exit_status = 0;
  double   f, x;
  NagError fail;

  INIT_FAIL(fail);

  /* Skip heading in data file */
  scanf("%*[^\n]");
  printf("nag_polygamma_fun (s14acc) Example Program Results\n");
  printf("     x       psi(x)-log(x)\n");
  while (scanf("%lf", &x) != EOF)
    {
      /* nag_polygamma_fun (s14acc).
       * psi(x) - ln(x)
       */
      f = nag_polygamma_fun(x, &fail);
      if (fail.code != NE_NOERROR)
        {
          printf("Error from nag_polygamma_fun (s14acc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      printf("%8.3f %14.4f\n", x, f);
    }

 END:
  return exit_status;
}