/* nag_rank_ci_2var (g07ebc) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagg07.h>

int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  /* Scalars */
  double   clevel, estcl, theta, thetal, thetau, ulower, uupper;
  Integer  exit_status, i, m, n;
  NagError fail;

  /* Arrays */
  double   *wrk = 0, *x = 0, *y = 0;
  Integer  *iwrk = 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_rank_ci_2var (g07ebc) Example Program Results\n");

  /* Skip Heading in data file */
  fscanf(fpin, "%*[^\n] %ld%ld%*[^\n] ", &n, &m);

  /* Allocate memory */
  if (!(wrk = NAG_ALLOC(600, double)) ||
      !(x = NAG_ALLOC(n, double)) ||
      !(y = NAG_ALLOC(m, double)) ||
      !(iwrk = NAG_ALLOC(300, Integer)))
    {
      fprintf(fpout, "Allocation failure\n");
      exit_status = -1;
      goto END;
    }
  fscanf(fpin, " %*[^\n] ");

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

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

  fscanf(fpin, " %lf%*[^\n] ", &clevel);

  /* nag_rank_ci_2var (g07ebc).
   * Robust confidence intervals, two-sample
   */
  nag_rank_ci_2var(Nag_RCI_Approx, n, x, m, y, clevel, &theta, &thetal,
                   &thetau, &estcl, &ulower, &uupper, &fail);
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_rank_ci_2var (g07ebc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

  fprintf(fpout, "\n");
  fprintf(fpout, " Location estimator     Confidence Interval\n");
  fprintf(fpout, "\n");
  fprintf(fpout, "   %10.4f           ( %6.4f , %6.4f )\n", theta, thetal,
          thetau);
  fprintf(fpout, "\n");
  fprintf(fpout, " Corresponding Mann-Whitney U statistics\n");
  fprintf(fpout, "\n");
  fprintf(fpout, " Lower : %8.2f\n Upper : %8.2f\n", ulower, uupper);
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (wrk) NAG_FREE(wrk);
  if (x) NAG_FREE(x);
  if (y) NAG_FREE(y);
  if (iwrk) NAG_FREE(iwrk);
  return exit_status;
}