/* nag_univar_robust_1var_ci (g07eac) Example Program.
 *
 * Copyright 2023 Numerical Algorithms Group.
 *
 * Mark 29.1, 2023.
 */

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

int main(void) {

  /* Scalars */
  double clevel, estcl, theta, thetal, thetau, wlower, wupper;
  Integer exit_status, i, n;
  NagError fail;

  /* Arrays */
  double *x = 0;

  INIT_FAIL(fail);

  exit_status = 0;
  printf("nag_univar_robust_1var_ci (g07eac) Example Program Results\n");

  /* Skip heading in data file */
  scanf("%*[^\n] ");
  scanf("%" NAG_IFMT "%*[^\n] ", &n);

  /* Allocate memory */
  if (!(x = NAG_ALLOC(n, double))) {
    printf("Allocation failure\n");
    exit_status = -1;
    goto END;
  }

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

  /* nag_univar_robust_1var_ci (g07eac).
   * Robust confidence intervals, one-sample
   */
  nag_univar_robust_1var_ci(Nag_RCI_Exact, n, x, clevel, &theta, &thetal,
                            &thetau, &estcl, &wlower, &wupper, &fail);
  if (fail.code != NE_NOERROR) {
    printf("Error from nag_univar_robust_1var_ci (g07eac).\n%s\n",
           fail.message);
    exit_status = 1;
    goto END;
  }

  printf("\n");
  printf(" Location estimator     Confidence Interval\n");
  printf("\n");
  printf("%10.4f            ( %6.4f , %6.4f )\n", theta, thetal, thetau);
  printf("\n");
  printf(" Corresponding Wilcoxon statistics\n");
  printf("\n");
  printf(" Lower : %8.2f\n", wlower);
  printf(" Upper : %8.2f\n", wupper);

END:
  NAG_FREE(x);
  return exit_status;
}