/* nag_tsa_mean_range (g13auc) 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, ngrps, m, n;

  /* Arrays */
  double   *mean = 0, *range = 0, *z = 0;
  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_tsa_mean_range (g13auc) Example Program Results\n");

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

  fscanf(fpin, "%ld%ld%*[^\n] ", &n, &m);
  if (n >= m && m >= 1)
    {
      ngrps = n / m;

      /* Allocate arrays */
      if (!(mean = NAG_ALLOC(ngrps, double)) ||
          !(range = NAG_ALLOC(ngrps, double)) ||
          !(z = NAG_ALLOC(n, double)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }

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

      fprintf(fpout, "\n");

      /* nag_tsa_mean_range (g13auc).
       * Computes quantities needed for range-mean or standard
       * deviation-mean plot
       */
      nag_tsa_mean_range(n, z, m, Nag_UseRange, range, mean, &fail);
      if (fail.code != NE_NOERROR)
        {
          fprintf(fpout, "Error from nag_tsa_mean_range (g13auc).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }

      fprintf(fpout, "   Range      Mean\n");
      for (i = 1; i <= ngrps; i++)
        fprintf(fpout, "%8.3f  %8.3f\n", range[i-1], mean[i-1]);
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (mean) NAG_FREE(mean);
  if (range) NAG_FREE(range);
  if (z) NAG_FREE(z);

  return exit_status;
}