/* nag_mann_whitney (g08amc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * Mark 6a revised, 2001.
 */

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

int main (void)
{

  double p, u, z, *x=0, *y=0;
  Integer i, n1, n2;
  Integer exit_status=0;
  NagError fail;

  INIT_FAIL(fail);
  Vprintf("g08amc Example Program Results\n\n");

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

  Vscanf("%ld %ld ", &n1, &n2);
  Vprintf("%s%5ld\n","Sample size of group 1 = ", n1);
  Vprintf("%s%5ld\n", "Sample size of group 2 = ", n2);
  if (!(x = NAG_ALLOC(n1, double))
      || !(y = NAG_ALLOC(n2, double)))
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }
  Vprintf("\n");
  for (i = 1; i <= n1; ++i)
    Vscanf("%lf", &x[i - 1]);
  Vprintf("%s\n","Mann-Whitney U test");
  Vprintf("\n");
  Vprintf("%s\n", "Data values");
  Vprintf("\n");
  Vprintf("%s","    Group 1  ");
  for (i = 1; i <= n1; ++i)
    Vprintf("%5.1f%s",x[i - 1], i%8?"":"\n             ");
  for (i = 1; i <= n2; ++i)
    Vscanf("%lf", &y[i - 1]);
  Vprintf("\n");
  Vprintf("%s","    Group 2  ");
  for (i = 1; i <= n2; ++i)
    Vprintf("%5.1f%s",y[i - 1], i%8?"":"\n             ");

  g08amc(n1, x, n2, y, Nag_LowerTail, Nag_CompProbApprox,
         &u, &z, &p, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from g08amc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;

    }
  Vprintf("\n\n");
  Vprintf("%s%8.4f\n","Test statistic                 = ", u);
  Vprintf("%s%8.4f\n","Normal Statistic               = ", z);
  Vprintf("%s%8.4f\n","Approximate tail probability   = ", p);
  g08amc(n1, x, n2, y, Nag_LowerTail, Nag_CompProbExact,
         &u, &z, &p, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from g08amc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;

    }
  Vprintf("%s%8.4f\n","Exact tail probability         = ", p);
 END:
  if(x) NAG_FREE(x);
  if(y) NAG_FREE(y);
  return exit_status;
}