/* nag_ref_vec_multi_normal (g05eac) Example Program.
 *
 * Copyright 1991 Numerical Algorithms Group.
 *
 * Mark 2, 1991.
 *
 * Mark 3 revised, 1994.
 */

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

#define N   2
#define TDC N

int main(int argc, char *argv[])
{
  FILE     *fpout;
  Integer  exit_status = 0;
  Integer  i, j;
  double   a[N], c[N][TDC], z[N];
  double   *r = (double *) 0;
  double   eps = 0.01;
  NagError fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpout = nag_example_file_io(argc, argv, "-results", NULL);

  fprintf(fpout, "nag_ref_vec_multi_normal (g05eac) Example Program Results\n");
  a[0] = 1.0;
  a[1] = 2.0;
  c[0][0] = 2.0;
  c[1][1] = 3.0;
  c[0][1] = 1.0;
  c[1][0] = 1.0;
  /* nag_random_init_repeatable (g05cbc).
   * Initialize random number generating functions to give
   * repeatable sequence
   */
  nag_random_init_repeatable((Integer) 0);
  /* nag_ref_vec_multi_normal (g05eac).
   * Set up reference vector for multivariate Normal
   * distribution
   */
  nag_ref_vec_multi_normal(a, (Integer) N, &c[0][0], (Integer) TDC,
                           eps, &r, &fail);
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_ref_vec_multi_normal (g05eac) %s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }
  for (i = 1; i <= 5; i++)
    {
      /* nag_return_multi_normal (g05ezc).
       * Pseudo-random multivariate Normal vector from reference
       * vector
       */
      nag_return_multi_normal(z, r);
      for (j = 0; j < 2; j++)
        fprintf(fpout, "%10.4f", z[j]);
      fprintf(fpout, "\n");
    }

 END:
  if (fpout != stdout) fclose(fpout);
  if (r) NAG_FREE(r);

  return exit_status;
}