/* nag_mv_factor (g03cac) Example Program.
 *
 * Copyright 1998 Numerical Algorithms Group.
 *
 * Mark 5, 1998.
 * Mark 8 revised, 2004.
 *
 */

#include <nag.h>
#include <nagx04.h>
#include <stdio.h>
#include <string.h>
#include <nag_stdlib.h>
#include <nage04.h>
#include <nagg03.h>

#define FL(I, J) fl[(I) *tdfl + J]
#define X(I, J)  x[(I) *tdx + J]
int main(int argc, char *argv[])
{
  FILE        *fpin, *fpout;
  char        *outfile = 0;
  Integer     exit_status = 0, i, *isx = 0, j, l, m, n, nfac, nvar, tdfl, tdx;
  double      *com = 0, *e = 0, eps, *fl = 0, *psi = 0, *res = 0, *stat = 0;
  double      *wt = 0, *wtptr = 0, *x = 0;
  char        nag_enum_arg[40];
  Nag_Boolean weight;
  Nag_E04_Opt options;
  Nag_FacMat  matrix;
  NagError    fail;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpin = nag_example_file_io(argc, argv, "-data", NULL);
  fpout = nag_example_file_io(argc, argv, "-results", NULL);
  (void) nag_example_file_io(argc, argv, "-nag_write", &outfile);
  if (!outfile)
    {
      outfile = NAG_ALLOC(7, char);
      strcpy(outfile, "stdout");
    }

  fprintf(fpout, "nag_mv_factor (g03cac) Example Program Results\n\n");

  /* Skip headings in data file */
  fscanf(fpin, "%*[^\n]");

  fscanf(fpin, "%s", nag_enum_arg);
  /* nag_enum_name_to_value(x04nac).
   * Converts NAG enum member name to value
   */
  matrix = (Nag_FacMat) nag_enum_name_to_value(nag_enum_arg);
  fscanf(fpin, "%s", nag_enum_arg);
  weight = (Nag_Boolean) nag_enum_name_to_value(nag_enum_arg);

  fscanf(fpin, "%ld", &n);
  fscanf(fpin, "%ld", &m);
  fscanf(fpin, "%ld", &nvar);
  fscanf(fpin, "%ld", &nfac);

  if (nvar >= 2 && m >= nvar && n > nvar)
    {
      if (!(com = NAG_ALLOC(nvar, double)) ||
          !(e = NAG_ALLOC(nvar, double)) ||
          !(fl = NAG_ALLOC(nvar*nfac, double)) ||
          !(psi = NAG_ALLOC(nvar, double)) ||
          !(res = NAG_ALLOC(nvar*(nvar-1)/2, double)) ||
          !(stat = NAG_ALLOC(4, double)) ||
          !(wt = NAG_ALLOC(n, double)) ||
          !(x = NAG_ALLOC((matrix == Nag_MatCorr_Covar?m:n)*m, double)) ||
          !(isx = NAG_ALLOC(m, Integer)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }
      tdfl = nfac;
      tdx = m;
    }
  else
    {
      fprintf(fpout, "Invalid nvar or m or n.\n");
      exit_status = 1;
      return exit_status;
    }
  if (matrix == Nag_MatCorr_Covar)
    {
      for (i = 0; i < m; ++i)
        {
          for (j = 0; j < m; ++j)
            fscanf(fpin, "%lf", &X(i, j));
        }
    }
  else
    {
      if (weight)
        {
          for (i = 0; i < n; ++i)
            {
              for (j = 0; j < m; ++j)
                fscanf(fpin, "%lf", &X(i, j));
              fscanf(fpin, "%lf", &wt[i]);
            }
          wtptr = wt;
        }
      else
        {
          for (i = 0; i < n; ++i)
            {
              for (j = 0; j < m; ++j)
                fscanf(fpin, "%lf", &X(i, j));
            }
        }
    }
  for (j = 0; j < m; ++j)
    fscanf(fpin, "%ld", &isx[j]);

  /* nag_opt_init (e04xxc).
   * Initialization function for option setting
   */
  nag_opt_init(&options);
  options.max_iter = 500;
  options.optim_tol = 1e-2;
  strcpy(options.outfile, outfile);
  eps = 1e-5;
  /* nag_mv_factor (g03cac).
   * Maximum likelihood estimates of parameters
   */
  if (strcmp(outfile, "stdout"))
    fclose(fpout);
  nag_mv_factor(matrix, n, m, x, tdx, nvar, isx, nfac, wtptr, e,
                stat, com, psi, res, fl, tdfl, &options, eps, &fail);
  if (strcmp(outfile, "stdout"))
    {
      fpout = fopen(outfile, "a");
    }
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_mv_factor (g03cac).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
  fprintf(fpout, "\nEigenvalues\n\n");
  for (j = 0; j < m; ++j)
    {
      fprintf(fpout, " %13.4e%s", e[j], (j+1)%6 == 0?"\n":"");
    }
  fprintf(fpout, "\n\n%s%6.3f\n", "    Test Statistic = ", stat[1]);
  fprintf(fpout, "%s%6.3f\n", "                df = ", stat[2]);
  fprintf(fpout, "%s%6.3f\n\n", "Significance level = ", stat[3]);
  fprintf(fpout, "Residuals\n\n");
  l = 1;
  for (i = 1; i <= nvar-1; ++i)
    {
      for (j = l; j <= l+i-1; ++j)
        fprintf(fpout, " %8.3f", res[j-1]);
      fprintf(fpout, "\n");
      l += i;
    }
  fprintf(fpout, "\nLoadings, Communalities and PSI\n\n");
  for (i = 0; i < nvar; ++i)
    {
      for (j = 0; j < nfac; ++j)
        fprintf(fpout, " %8.3f", FL(i, j));
      fprintf(fpout, "%8.3f%8.3f\n", com[i], psi[i]);
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (com) NAG_FREE(com);
  if (e) NAG_FREE(e);
  if (fl) NAG_FREE(fl);
  if (psi) NAG_FREE(psi);
  if (res) NAG_FREE(res);
  if (stat) NAG_FREE(stat);
  if (wt) NAG_FREE(wt);
  if (x) NAG_FREE(x);
  if (isx) NAG_FREE(isx);
  if (outfile) NAG_FREE(outfile);

  return exit_status;
}