/* nag_prob_durbin_watson (g01epc) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagg01.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;

  /* Scalars */
  double   d, pdl, pdu;
  Integer  exit_status, ip, n;
  NagError fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpin = nag_example_file_io(argc, argv, "-data", NULL);
  fpout = nag_example_file_io(argc, argv, "-results", NULL);
  exit_status = 0;
  fprintf(fpout, "nag_prob_durbin_watson (g01epc) Example Program Results\n");

  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n] ");

  fscanf(fpin, "%ld%ld%lf%*[^\n] ", &n, &ip, &d);

  /* nag_prob_durbin_watson (g01epc).
   * Computes bounds for the significance of a Durbin-Watson
   * statistic
   */
  nag_prob_durbin_watson(n, ip, d, &pdl, &pdu, &fail);
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_prob_durbin_watson (g01epc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

  fprintf(fpout, "\n");
  fprintf(fpout, " Durbin-Watson statistic %10.4f\n\n", d);
  fprintf(fpout, " Probability for the lower bound = %10.4f\n", pdl);
  fprintf(fpout, " Probability for the upper bound = %10.4f\n", pdu);
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  return exit_status;
}