/* nag_smooth_spline_estim (g10acc) Example Program.
 *
 * Copyright 2000 Numerical Algorithms Group.
 *
 * Mark 6a revised, 2001.
 */

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

int main (void)
{
  char method[2], weight[2];
  double *coeff=0, crit, df, *h=0, *res=0, rho, rss, tol, u, *weights=0, *wtptr;
  double *wwt=0, *x=0, *xord=0, *y=0, *yhat=0, *yord=0;
  Integer i, maxcal, n, nord;
  Integer exit_status=0;
  NagError fail;
  Nag_SmoothParamMethods method_enum;

  INIT_FAIL(fail);
  Vprintf("g10acc Example Program Results\n");

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

  Vscanf("%ld", &n);
  if (!(x = NAG_ALLOC(n, double))
      || !(y = NAG_ALLOC(n, double))
      || !(weights = NAG_ALLOC(n, double))
      || !(yhat = NAG_ALLOC(n, double))
      || !(coeff = NAG_ALLOC((n-1)*3, double))
      || !(res = NAG_ALLOC(n, double))
      || !(h = NAG_ALLOC(n, double))
      || !(wwt = NAG_ALLOC(n, double))
      || !(yord = NAG_ALLOC(n, double))
      || !(xord = NAG_ALLOC(n, double)))
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  Vscanf(" %s %s ", method, weight);

  if (*method == 'C')
    method_enum = Nag_SmoothParamCV;
  else if (*method == 'G')
    method_enum = Nag_SmoothParamGCV;
  else if (*method == 'D')
    method_enum = Nag_SmoothParamDF;
  else
    method_enum = (Nag_SmoothParamMethods)-999;

  if (*weight == 'U')
    {
      for (i = 1; i <= n; ++i)
        Vscanf("%lf %lf", &x[i - 1], &y[i - 1]);
      wtptr = 0;
    }
  else
    {
      for (i = 1; i <= n; ++i)
        Vscanf("%lf %lf %lf", &x[i - 1], &y[i - 1], &weights[i - 1]);
      wtptr = weights;
    }

  Vscanf("%lf %lf %ld %lf", &u, &tol, &maxcal, &crit);
  /* Sort data, removing ties and weighting accordingly */
  g10zac(n, x, y, wtptr, &nord, xord, yord, wwt, &rss, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from g10zac.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  /* Fit cubic spline */
  g10acc(method_enum, nord, xord, yord, wwt, yhat, coeff, &rss,
         &df, res, h, &crit, &rho, u, tol, maxcal, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from g10acc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Print results */
  Vprintf("\n");
  Vprintf("%s%10.2f\n", " Residual sum of squares = ", rss);
  Vprintf("%s%10.2f\n"," Degrees of freedom = ", df);
  Vprintf("%s%10.2f\n", " rho = ", rho);
  Vprintf("\n");
  Vprintf("\n%s%s%s\n%s%s%s\n", "     Input data",
          "                ",
          "Output results",
          "   i    x        y   ",
          "          ",
          "yhat     h");

  for (i = 1; i <= nord; ++i)
    Vprintf("%4ld %8.3f %8.3f      %8.3f %8.3f\n",
            i, xord[i - 1], yord[i - 1], yhat[i - 1], h[i - 1]);
 END:
  if (x) NAG_FREE(x);
  if (y) NAG_FREE(y);
  if (weights) NAG_FREE(weights);
  if (yhat) NAG_FREE(yhat);
  if (coeff) NAG_FREE(coeff);
  if (res) NAG_FREE(res);
  if (h) NAG_FREE(h);
  if (wwt) NAG_FREE(wwt);
  if (yord) NAG_FREE(yord);
  if (xord) NAG_FREE(xord);
  return exit_status;
}