/* nag_running_median_smoother (g10cac) Example Program.
 *
 * Copyright 1992 Numerical Algorithms Group.
 *
 * Mark 3, 1992.
 * Mark 8 revised, 2004.
 */

#include <nag.h>
#include <nagx04.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg10.h>

int main(int argc, char *argv[])
{
  FILE            *fpin, *fpout;
  Integer         exit_status = 0, i, isel, n;
  NagError        fail;
  Nag_Smooth_Type smoother;
  double          *rough = 0, *smooth = 0, *y = 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);

  fprintf(fpout,
          "nag_running_median_smoother (g10cac) Example Program Results\n");
  /* Skip heading in data file */
  fscanf(fpin, "%*[^\n]");

  fscanf(fpin, "%ld", &n);
  if (n >= 1)
    {
      if (!(rough = NAG_ALLOC(n, double)) ||
          !(smooth = NAG_ALLOC(n, double)) ||
          !(y = NAG_ALLOC(n, double)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }
    }
  else
    {
      fprintf(fpout, "Invalid n.\n");
      exit_status = 1;
      return exit_status;
    }
  for (i = 0; i < n; ++i)
    fscanf(fpin, "%lf", &y[i]);

  for (isel = 1; isel <= 2; ++isel)
    {
      /* Select the smoothing method. */
      if (isel == 1)
        smoother = Nag_4253H;
      else if (isel == 2)
        smoother = Nag_3RSSH;

      if (smoother == Nag_4253H)
        fprintf(fpout, "\nExample 1: Data smoothing using  4253H method.\n\n");
      else if (smoother == Nag_3RSSH)
        fprintf(fpout,
                "\n\nExample 2: Data smoothing using  3RSSH method.\n\n");

      /* nag_running_median_smoother (g10cac).
       * Compute smoothed data sequence using running median
       * smoothers
       */
      nag_running_median_smoother(smoother, n, y, smooth, rough, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout,
                  "Error from nag_running_median_smoother (g10cac).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }

      fprintf(fpout, "     index        data          smooth          rough\n");
      for (i = 0; i < n; ++i)
        fprintf(fpout, "%9ld%15.4f%15.4f%15.4f\n", i, y[i], smooth[i],
                rough[i]);
    }
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (rough) NAG_FREE(rough);
  if (smooth) NAG_FREE(smooth);
  if (y) NAG_FREE(y);
  return exit_status;
}