/* nag_sign_test (g08aac) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * Mark 6, 2000.
 */


#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagg08.h>


int main(int argc, char *argv[])
{
  FILE     *fpin, *fpout;
  Integer  exit_status = 0, i, n, non_tied, s;
  NagError fail;
  double   p, *x = 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_sign_test (g08aac) Example Program Results\n");

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

  n = 17;
  if (!(x = NAG_ALLOC(n, double))
     || !(y = NAG_ALLOC(n, double)))
    {
      fprintf(fpout, "Allocation failure\n");
      exit_status = -1;
      goto END;
    }

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

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

  fprintf(fpout, "\n%s\n\n", "Sign test");
  fprintf(fpout, "%s\n\n", "Data values");
  for (i = 1; i <= n; i++)
    fprintf(fpout, "%3.0f%s", x[i-1], i%n?"":"\n");
  fprintf(fpout, "\n");

  for (i = 1; i <= n; i++)
    fprintf(fpout, "%3.0f%s", y[i-1], i%n?"":"\n");
  fprintf(fpout, "\n");

  /* nag_sign_test (g08aac).
   * Sign test on two paired samples
   */
  nag_sign_test(n, x, y, &s, &p, &non_tied, &fail);
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_sign_test (g08aac).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  fprintf(fpout, "%s%5ld\n", "Test statistic   ", s);
  fprintf(fpout, "%s%5ld\n", "Observations     ", non_tied);
  fprintf(fpout, "%s%5.3f\n", "Lower tail prob. ", p);
 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (x) NAG_FREE(x);
  if (y) NAG_FREE(y);
  return exit_status;
}