/* nag_tsa_diff (g13aac) Example Program.
 *
 * Copyright 2002 Numerical Algorithms Group.
 *
 * Mark 7, 2002.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagg13.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  /* Scalars */
  Integer  exit_status, i, d, ds, s, nx, nxd;
  NagError fail;

  /* Arrays */
  double   *x = 0, *xd = 0;

  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_tsa_diff (g13aac) Example Program Results\n");

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

  fscanf(fpin, "%ld%ld%ld%ld%*[^\n] ", &nx, &d,
         &ds, &s);

  if (nx > 0)
    {
      /* Allocate memory */
      if (!(x = NAG_ALLOC(nx, double)) ||
          !(xd = NAG_ALLOC(nx, double)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }

      for (i = 1; i <= nx; ++i)
        fscanf(fpin, "%lf", &x[i-1]);
      fscanf(fpin, "%*[^\n] ");

      fprintf(fpout, "\n");
      fprintf(fpout, "Non-seasonal differencing of order %ld "
              "and seasonal differencing\nof order %ld "
              "with seasonality %ld are applied\n", d, ds, s);

      /* nag_tsa_diff (g13aac).
       * Univariate time series, seasonal and non-seasonal
       * differencing
       */
      nag_tsa_diff(x, nx, d, ds, s, xd, &nxd, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_tsa_diff (g13aac).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }

      fprintf(fpout, "\n");
      fprintf(fpout, "The output array holds %2ld values, of which the "
              "first %2ld are differenced values\n\n", nx, nxd);

      for (i = 1; i <= nx; ++i)
        {
          fprintf(fpout, "%10.1f", xd[i-1]);
          if (i % 5 == 0 || i == nx)
            fprintf(fpout, "\n");
        }
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (x) NAG_FREE(x);
  if (xd) NAG_FREE(xd);

  return exit_status;
}