/* nag_ran_permut_vec (g05ehc) Example Program.
 *
 * Copyright 1992 Numerical Algorithms Group.
 *
 * Mark 3, 1992.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg05.h>

#define NMAX 8

int main(void)
{
  Integer  exit_status = 0;
  Integer  j, k, n, m;
  Integer  index[NMAX];
  Integer  seed = 0;
  NagError fail;

  INIT_FAIL(fail);

  printf("nag_ran_permut_vec (g05ehc) Example Program Results\n");
  /* nag_random_init_repeatable (g05cbc).
   * Initialize random number generating functions to give
   * repeatable sequence
   */
  nag_random_init_repeatable(seed);
  n = NMAX;
  m = 10;

  printf(
          "\n%ld  Permutations of the first  %ld integers \n\n",
          m, n);
  for (j = 0; j < m; ++j)
    {
      /* construct index vector to be permuted */
      for (k = 0; k < n; ++k)
        index[k] = k;
      /* nag_ran_permut_vec (g05ehc).
       * Pseudo-random permutation of an integer vector
       */
      nag_ran_permut_vec(index, n, &fail);
      if (fail.code != NE_NOERROR)
        {
          printf("Error from nag_ran_permut_vec (g05ehc) %s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      for (k = 0; k < n; ++k)
        printf("%ld   ", index[k]);
      printf("\n");
    }

 END:
  return exit_status;
}