/* nag_gaps_test (g08edc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * Mark 6, 2000.
 *
 * Mark 8 revised, 2004
 *
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagg05.h>
#include <nagg08.h>

int main (void)
{
  Integer exit_status=0, igen = 0, iseed[] = {0, 0, 0, 0}, max_gap, n, num_gaps;
  NagError fail;
  double chi, df, enda, endb, length, lower, p, upper, *x=0;

  INIT_FAIL(fail);
  Vprintf("nag_gaps_test (g08edc) Example Program Results\n");
  /* nag_rngs_init_repeatable (g05kbc).
   * Initialize seeds of a given generator for random number
   * generating functions (that pass seeds explicitly) to give
   * a repeatable sequence
   */
  nag_rngs_init_repeatable(&igen, iseed);
  n = 5000;
  if (!(x = NAG_ALLOC(n, double)))
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  enda = 0.0;
  endb = 1.0;
  /* nag_rngs_uniform (g05lgc).
   * Generates a vector of random numbers from a uniform
   * distribution, seeds and generator number passed
   * explicitly
   */
  nag_rngs_uniform(enda, endb, n, x, igen, iseed, NAGERR_DEFAULT);
  num_gaps = 0;
  max_gap = 10;
  length = 1.0;
  lower = 0.4;
  upper = 0.6;
  /* nag_gaps_test (g08edc).
   * Performs the gaps test for randomness
   */
  nag_gaps_test(n, x, num_gaps, max_gap, lower, upper, length, &chi, &df, &p,
                &fail);

  if (fail.code != NE_NOERROR && fail.code != NE_G08ED_GAPS &&
      NE_G08ED_FREQ_LT_ONE)
    {
      Vprintf("Error from nag_gaps_test (g08edc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  Vprintf("\n");
  Vprintf("%s%10.4f\n", "Chisq = ", chi);
  Vprintf("%s%7.1f\n", "DF    = ", df);
  Vprintf("%s%10.4f\n", "Prob  = ", p);
  if (fail.code == NE_G08ED_FREQ_LT_ONE)
    Vprintf("Error from nag_gaps_test (g08edc).\n%s\n", fail.message);
 END:
  if (x) NAG_FREE(x);
  return exit_status;
}