/* nag_rngs_gamma (g05lfc) 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, n;
  Integer  exit_status = 0;
  NagError fail;

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

  INIT_FAIL(fail);

  printf("nag_rngs_gamma (g05lfc) Example Program Results\n\n");

  n = 5;
  /* Allocate memory */
  if (!(x = NAG_ALLOC(n, double)))
    {
      printf("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);

  printf("Gamma Dist --- A=5.0, B=1.0\n");

  /* nag_rngs_gamma (g05lfc).
   * Generates a vector of random numbers from a gamma
   * distribution, seeds and generator number passed
   * explicitly
   */
  nag_rngs_gamma(5.0, 1.0, n, x, igen, iseed, &fail);
  if (fail.code != NE_NOERROR)
    {
      printf("Error from nag_rngs_gamma (g05lfc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  for (j = 0; j < n; ++j)
    {
      printf("%10.4f\n", x[j]);
    }
 END:
  if (x) NAG_FREE(x);
  return exit_status;
}