/* nag_rngs_exp_mix (g05lqc) 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  igen, j, m, nmix;
  Integer  exit_status=0;
  NagError fail;

  /* Arrays */
  double   *a=0, *wgt=0, *x=0;
  Integer  iseed[4];

  INIT_FAIL(fail);
  Vprintf("nag_rngs_exp_mix (g05lqc) Example Program Results\n\n");

  m = 5;
  nmix = 3;
  /* Allocate memory */
  if ( !(a = NAG_ALLOC(nmix, double)) ||
       !(wgt = NAG_ALLOC(nmix, double)) ||
       !(x = NAG_ALLOC(m, double)) )
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  /* 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);

  a[0] = 1.0;
  a[1] = 5.0;
  a[2] = 2.0;

  wgt[0] = 0.5;
  wgt[1] = 0.3;
  wgt[2] = 0.2;

  /* nag_rngs_exp_mix (g05lqc).
   * Generates a vector of random numbers from an exponential
   * mixture distribution, seeds and generator number passed
   * explicitly
   */
  nag_rngs_exp_mix(nmix, a, wgt, m, x, igen, iseed, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_rngs_exp_mix (g05lqc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  for (j = 0; j < m; ++j)
    {
      Vprintf("%10.4f\n",   x[j]);
    }
 END:
  if (a) NAG_FREE(a);
  if (wgt) NAG_FREE(wgt);
  if (x) NAG_FREE(x);
  return exit_status;
}