/* nag_mv_kmeans_cluster_analysis (g03efc) Example Program.
 *
 * Copyright 1998 Numerical Algorithms Group.
 *
 * Mark 5, 1998.
 * Mark 7, revised, 2001.
 * Mark 8 revised, 2004.
 *
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg03.h>

#define CMEANS(I,J) cmeans[(I)*tdcmeans + J]
#define X(I,J) x[(I)*tdx + J]
int main(void)
{

  Integer exit_status=0, i, *inc=0, *isx=0, j, k, m, maxit, n, *nic=0, nvar;
  Integer tdcmeans, tdx;
  NagError fail;
  char weight[2];
  double *cmeans=0, *css=0, *csw=0, *wt=0, *wtptr, *x=0;

  INIT_FAIL(fail);
  Vprintf("nag_mv_kmeans_cluster_analysis (g03efc) Example Program Results"
          "\n\n");

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

  Vscanf("%s",weight);
  Vscanf("%ld",&n);
  Vscanf("%ld",&m);
  Vscanf("%ld",&nvar);
  Vscanf("%ld",&k);
  Vscanf("%ld",&maxit);

  if (n>=2 && nvar>=1 && m>=nvar && k>=2)
    {
      if ( !( cmeans = NAG_ALLOC((k)*(nvar), double)) ||
           !( css = NAG_ALLOC(k, double)) ||
           !( csw = NAG_ALLOC(k, double)) ||
           !( wt = NAG_ALLOC(n, double)) ||
           !( x = NAG_ALLOC((n)*(m), double))  ||
           !( inc = NAG_ALLOC(n, Integer)) ||
           !( isx = NAG_ALLOC(m, Integer)) ||
           !( nic = NAG_ALLOC(k, Integer)) )
        {
          Vprintf("Allocation failure\n");
          exit_status = -1;
          goto END;
        }
      tdx = m;
      tdcmeans = nvar;
    }
  else
    {
      Vprintf("Invalid n or nvar or m or k.\n");
      exit_status = 1;
      return exit_status;
    }
  if (*weight == 'W')
    {
      for (i = 0; i < n; ++i)
        {
          for (j = 0; j < m; ++j)
            Vscanf("%lf",&X(i,j));
          Vscanf("%lf",&wt[i]);
        }
      wtptr = wt;
    }
  else
    {
      for (i = 0; i < n; ++i)
        {
          for (j = 0; j < m; ++j)
            Vscanf("%lf",&X(i,j));
        }
      wtptr = 0;
    }
  for (i = 0; i < k; ++i)
    {
      for (j = 0; j < nvar; ++j)
        Vscanf("%lf",&CMEANS(i,j));
    }
  for (j = 0; j < m; ++j)
    Vscanf ("%ld",&isx[j]);

  /* nag_mv_kmeans_cluster_analysis (g03efc).
   * K-means
   */
  nag_mv_kmeans_cluster_analysis(n, m, x, tdx, isx, nvar, k, cmeans,
                                 tdcmeans, wtptr, inc, nic, css, csw, maxit,
                                 &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_mv_kmeans_cluster_analysis (g03efc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

  Vprintf("\nThe cluster each point belongs to\n");
  for (i = 0; i < n; ++i)
    Vprintf(" %6ld%s",inc[i], (i+1)%10 ? "" : "\n");

  Vprintf("\n\nThe number of points in each cluster\n");
  for (i = 0; i < k; ++i)
    Vprintf(" %6ld",nic[i]);

  Vprintf("\n\nThe within-cluster sum of weights of each cluster\n");
  for (i = 0; i < k; ++i)
    Vprintf(" %9.2f",csw[i]);

  Vprintf("\n\nThe within-cluster sum of squares of each cluster\n\n");
  for (i = 0; i < k; ++i)
    Vprintf(" %13.4f",css[i]);

  Vprintf("\n\nThe final cluster centres\n");
  Vprintf("                  1       2       3       4       5\n");
  for (i = 0; i < k; ++i)
    {
      Vprintf(" %5ld     ",i+1);
      for (j = 0; j < nvar; ++j)
        Vprintf("%8.4f",CMEANS(i,j));
      printf("\n");
    }
 END:
  if (cmeans) NAG_FREE(cmeans);
  if (css) NAG_FREE(css);
  if (csw) NAG_FREE(csw);
  if (wt) NAG_FREE(wt);
  if (x) NAG_FREE(x);
  if (inc) NAG_FREE(inc);
  if (isx) NAG_FREE(isx);
  if (nic) NAG_FREE(nic);
  return exit_status;

}