/* nag_resgn_mult_linear_add_var(g02dec) Example Program
 *
 * Copyright 1991 Numerical Algorithms Group.
 *
 * Mark 2, 1991.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nagg02.h>

#define NMAX 12
#define MMAX 5
#define TDX MMAX
#define TDQ MMAX+1

int main(void)
{
  double rss, rsst, tol;
  Integer  i, indx, ip, rank, j, m, n;
  double df;
  Boolean  svd;
  char     meanc, weight;
  Nag_IncludeMean  mean;
  double   b[MMAX], cov[MMAX*(MMAX+1)/2], p[MMAX*(MMAX+2)],
  q[NMAX][MMAX+1], se[MMAX], wt[NMAX], x[NMAX][MMAX], xe[NMAX];
  double   *wtptr;
  static   NagError fail;

  Vprintf("g02dec Example Program Results\n");
  /* Skip heading in data file */
  Vscanf("%*[^\n]");
  Vscanf("%ld %ld %c %c", &n, &m, &weight, &meanc);
  if (meanc=='m')
    mean = Nag_MeanInclude;
  else
    mean = Nag_MeanZero;

  if (weight=='w')
    wtptr = wt;
  else
    wtptr = (double *)0;

  if (n<=NMAX && m<MMAX)
    {
      if (wtptr)
        {
          for (i=0; i<n; i++)
            {
              for (j=0; j<m; j++)
                Vscanf("%lf", &x[i][j]);
              Vscanf("%lf%lf", &q[i][0], &wt[i]);
            }
        }
      else
        {
          for (i=0; i<n; i++)
            {
              for (j=0; j<m; j++)
                Vscanf("%lf", &x[i][j]);
              Vscanf("%lf", &q[i][0]);
            }
        }
      /* Set tolerance */
      tol = 0.000001e0;
      ip = 0;
      if (mean==Nag_MeanInclude)
        {
          for (i = 0; i<n; ++i)
            xe[i] = 1.0;

          g02dec(n, ip, &q[0][0], (Integer)(TDQ), p, wtptr, xe, &rss,
                 tol, NAGERR_DEFAULT);

          ip = 1;
        }
      while(scanf("%ld", &indx)!=EOF)
        {
          if (indx>0)
            {
              for (i=0; i<n; i++)
                xe[i] = x[i][indx-1];
              g02dec(n, ip, &q[0][0], (Integer)(TDQ), p, wtptr, xe, &rss,
                     tol, &fail);
              if (fail.code==NE_NOERROR)
                {
                  ip += 1;
                  Vprintf("Variable %4ld added\n", indx);
                  rsst = 0.0;

                  g02ddc(n, ip, &q[0][0], (Integer)(TDQ), &rsst, &df, b, se,
                         cov, &svd, &rank, p, tol, NAGERR_DEFAULT);

                  if (svd)
                    Vprintf("Model not of full rank\n\n");
                  Vprintf("Residual sum of squares = %13.4e\n", rsst);
                  Vprintf("Degrees of freedom = %3.1f\n\n", df);
                  Vprintf("Variable    Parameter estimate   Standard error\n\n");
                  for (j=0; j<ip; j++)
                    Vprintf("%6ld%20.4e%20.4e\n", j+1, b[j], se[j]);
                  Vprintf("\n");
                }
              else if (fail.code==NE_NVAR_NOT_IND)
                Vprintf(" * New variable not added *\n");
              else
                {
                  Vprintf("%s\n", fail.message);
                  return EXIT_FAILURE;
                }
            }
        }
    }
  else
    {
      Vfprintf(stderr, "One or both of m and n are out of range:"
               " m = %-3ld while  n = %-3ld\n", m, n);

      return EXIT_FAILURE;
    }
  return EXIT_SUCCESS;
}