/* nag_kernel_density_estim (g10bac) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * Mark 6, 2000.
 */

#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagg01.h>
#include <nagg05.h>
#include <nagg10.h>

int main(void)
{
  Integer i, init, increment, j, n, ns;
  Integer exit_status=0;
  double enda, endb, *s=0, high, low, *smooth=0, window, *x=0;
  Integer ifail, *isort=0;
  Boolean usefft;
  NagError fail;

  INIT_FAIL(fail);
  Vprintf("g10bac Example Program Results\n");

/* Skip heading in data file */
  Vscanf("%*[^\n] ");

  Vscanf("%lf ", &window);
  Vscanf("%lf , %lf", &low, &high);
/* Generate Normal (0,1) Distribution */
  n = 1000;
  ns = 100;
  if (!(x = NAG_ALLOC(n, double))
      || !(s = NAG_ALLOC(ns, double))
      || !(smooth = NAG_ALLOC(ns, double))
      || !(isort = NAG_ALLOC(ns, Integer)))
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  init = 0;
  g05cbc(init);
  enda = 0.0;
  endb = 1.0;
  for (i = 0; i < n; i++)
    x[i] = g05ddc(enda, endb);

/* Perform kernel density estimation */
  usefft = FALSE;
  ifail = 0;
   g10bac(n, x, window, low, high, ns, smooth, s, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from g10bac.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  printf("    Points     Density   Points     Density   Points     Density   Points     Density\n");
  printf("               Value                Value                Value                Value\n\n");


  increment = 25;
  for (i=1; i<= ns/4; i++)
    {
      printf("%10.4f %10.4f", s[i-1], smooth[i-1]);
      for (j=1; j <= 3; j++)
        {
          printf("%10.4f %10.4f", s[i-1+j*increment], smooth[i-1+j*increment]);
        }
      printf("\n");
    }
 END:
  if (x) NAG_FREE(x);
  if (s) NAG_FREE(s);
  if (smooth) NAG_FREE(smooth);
  if (isort) NAG_FREE(isort);
  return exit_status;
}