/* nag_rngs_compd_poisson (g05mec) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

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

int main(void)
{
  /* Scalars */
  Integer  i, igen, j, m, n;
  Integer  exit_status = 0;
  NagError fail;

  /* Arrays */
  double   *vlamda = 0;
  Integer  *x = 0;
  Integer  iseed[4];

  INIT_FAIL(fail);

  printf("nag_rngs_compd_poisson (g05mec) Example Program Results\n\n");
  m = 5;
  n = 10;

  /* Allocate memory */
  if (!(vlamda = NAG_ALLOC(m, double)) ||
      !(x = NAG_ALLOC(m, Integer)))
    {
      printf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  /* Set the distribution parameter LAMBDA */
  vlamda[0] = 0.5;
  vlamda[1] = 5.0;
  vlamda[2] = 10.0;
  vlamda[3] = 500.0;
  vlamda[4] = 1e3;
  /* Initialise the seed to a repeatable sequence */
  iseed[0] = 1762543;
  iseed[1] = 9324783;
  iseed[2] = 423442;
  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);

  /* Generate integers and store in X */
  for (i = 0; i < n; ++i)
    {
      /* nag_rngs_compd_poisson (g05mec).
       * Generates a vector of random integers from a Poisson
       * distribution with varying mean, seeds and generator
       * number passed explicitly
       */
      nag_rngs_compd_poisson(m, vlamda, x, igen, iseed, &fail);
      if (fail.code != NE_NOERROR)
        {
          printf("Error from nag_rngs_compd_poisson (g05mec).\n%s\n",
                  fail.message);
          exit_status = 1;
          goto END;
        }
      for (j = 0; j < m; ++j)
        {
          printf("%12ld%s", x[j],
                  (j+1)%5 == 0 || j == 4?"\n":" ");
        }
    }
 END:
  if (vlamda) NAG_FREE(vlamda);
  if (x) NAG_FREE(x);
  return exit_status;
}