/* nag_tsa_uni_means (g13auc) Example Program.
 *
 * Copyright 2021 Numerical Algorithms Group.
 *
 * Mark 27.2, 2021.
 */

#include <nag.h>
#include <stdio.h>

int main(void) {
  /* Scalars */
  Integer exit_status, i, ngrps, m, n;

  /* Arrays */
  double *mean = 0, *range = 0, *z = 0;
  NagError fail;

  INIT_FAIL(fail);

  exit_status = 0;

  printf("nag_tsa_uni_means (g13auc) Example Program Results\n");

  /* Skip heading in data file */
  scanf("%*[^\n] ");
  scanf("%" NAG_IFMT "%" NAG_IFMT "%*[^\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))) {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

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

    printf("\n");

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

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

END:
  NAG_FREE(mean);
  NAG_FREE(range);
  NAG_FREE(z);

  return exit_status;
}