/* nag_rngs_gen_multinomial (g05mrc) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagg05.h>

int main(int argc, char *argv[])
{
  FILE          *fpout;
  /* Scalars */
  Integer       i, igen, j, k, m, n, nr;
  Integer       exit_status = 0;
  Integer       pdx;
  NagError      fail;
  Nag_OrderType order;

  /* Arrays */
  double        *p = 0, *r = 0;
  Integer       *x = 0;
  Integer       iseed[4];


#ifdef NAG_COLUMN_MAJOR
#define X(I, J) x[(J-1)*pdx + I - 1]
  order = Nag_ColMajor;
#else
#define X(I, J) x[(I-1)*pdx + J - 1]
  order = Nag_RowMajor;
#endif

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpout = nag_example_file_io(argc, argv, "-results", NULL);
  fprintf(fpout,
          "nag_rngs_gen_multinomial (g05mrc) Example Program Results\n\n");
  k = 4;
  n = 20;
  nr = 16007;

  /* Allocate memory */
  if (!(p = NAG_ALLOC(k, double)) ||
      !(r = NAG_ALLOC(nr, double)) ||
      !(x = NAG_ALLOC(n * k, Integer)))
    {
      fprintf(fpout, "Allocation failure\n");
      exit_status = -1;
      goto END;
    }

#ifdef NAG_COLUMN_MAJOR
  pdx = n;
#else
  pdx = k;
#endif

  /* Set the distribution parameters P and M */
  p[0] = 0.08;
  p[1] = 0.1;
  p[2] = 0.8;
  p[3] = 0.02;
  m = 6000;
  /* Initialise the seed to a repeatable sequence */
  iseed[0] = 1762543;
  iseed[1] = 9324783;
  iseed[2] = 42344;
  iseed[3] = 742355;
  /* igen identifies the stream. */
  igen = 1;
  /* 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);

  /* Choose MODE = 2 */
  /* nag_rngs_gen_multinomial (g05mrc).
   * Generates a vector of random integers from a multinomial
   * distribution, seeds and generator number passed
   * explicitly
   */
  nag_rngs_gen_multinomial(order, 2, m, k, p, n, x, pdx, igen, iseed, r, &fail);
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_rngs_gen_multinomial (g05mrc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }
  for (i = 1; i <= n; ++i)
    {
      for (j = 1; j <= k; ++j)
        {
          fprintf(fpout, "%12ld%s", X(i, j),
                  j%10 == 0 || j == 4?"\n":" ");
        }
    }
 END:
  if (fpout != stdout) fclose(fpout);
  if (p) NAG_FREE(p);
  if (r) NAG_FREE(r);
  if (x) NAG_FREE(x);
  return exit_status;
}