/* nag_opt_lin_lsq (e04ncc) Example Program.
 *
 * Copyright 1998 Numerical Algorithms Group.
 *
 * Mark 5, 1998.
 *
 * Mark 6 revised, 2000.
 * Mark 8 revised, 2004.
 *
 */

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

#define A(I, J) a[(I) *tda + J]
#define H(I, J) h[(I) *tdh + J]

int main(int argc, char *argv[])
{
  FILE        *fpin, *fpout;
  char        *outfile = 0;
  char        *optionsfile = 0;
  Integer     exit_status = 0;
  Integer     i, j, *kx = 0, m, n, nbnd, nclin, tda, tdh;
  Nag_E04_Opt options;
  double      *a = 0, *bl = 0, *bu = 0, *cvec = 0, *h = 0, objf, *x = 0;
  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, "-options", &optionsfile);
  (void) nag_example_file_io(argc, argv, "-nag_write", &outfile);
  if (!outfile)
    {
      outfile = NAG_ALLOC(7, char);
      strcpy(outfile, "stdout");
    }

  fprintf(fpout, "nag_opt_lin_lsq (e04ncc) Example Program Results\n");

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

  /* Read problem dimensions */
  fscanf(fpin, " %*[^\n]");
  fscanf(fpin, "%ld%ld%ld%*[^\n]", &m, &n, &nclin);

  if (m > 0 && n > 0 && nclin >= 0)
    {
      nbnd = n + nclin;
      if (!(a = NAG_ALLOC(nclin*n, double)) ||
          !(bl = NAG_ALLOC(nbnd, double)) ||
          !(bu = NAG_ALLOC(nbnd, double)) ||
          !(cvec = NAG_ALLOC(n, double)) ||
          !(h = NAG_ALLOC(m*n, double)) ||
          !(x = NAG_ALLOC(n, double)) ||
          !(kx = NAG_ALLOC(n, Integer)))
        {
          fprintf(fpout, "Allocation failure\n");
          exit_status = -1;
          goto END;
        }
      tda = n;
      tdh = n;
    }
  else
    {
      fprintf(fpout, "Invalid m or n or nclin.\n");
      exit_status = 1;
      return exit_status;
    }

  /* We solve a QP2 type problem in this example */

  /* Read cvec, h, a, bl, bu and x from data file */

  fscanf(fpin, " %*[^\n]");
  for (i = 0; i < m; ++i)
    fscanf(fpin, "%lf", &cvec[i]);

  fscanf(fpin, " %*[^\n]");
  for (i = 0; i < m; ++i)
    for (j = 0; j < n; ++j)
      fscanf(fpin, "%lf", &H(i, j));

  if (nclin > 0)
    {
      fscanf(fpin, " %*[^\n]");
      for (i = 0; i < nclin; ++i)
        for (j = 0; j < n; ++j)
          fscanf(fpin, "%lf", &A(i, j));
    }

  /* Read lower bounds */
  fscanf(fpin, " %*[^\n]");
  for (i = 0; i < nbnd; ++i)
    fscanf(fpin, "%lf", &bl[i]);

  /* Read upper bounds */
  fscanf(fpin, " %*[^\n]");
  for (i = 0; i < nbnd; ++i)
    fscanf(fpin, "%lf", &bu[i]);

  /* Read the initial point x */
  fscanf(fpin, " %*[^\n]");
  for (i = 0; i < n; ++i)
    fscanf(fpin, "%lf", &x[i]);

  /* Change the problem type */
  /* nag_opt_init (e04xxc).
   * Initialization function for option setting
   */
  nag_opt_init(&options);
  strcpy(options.outfile, outfile);
  options.prob = Nag_QP2;

  /* nag_opt_lin_lsq (e04ncc), see above. */
  if (strcmp(outfile, "stdout"))
    fclose(fpout);
  nag_opt_lin_lsq(m, n, nclin, a, tda, bl, bu, cvec, (double *) 0,
                  h, tdh, kx, x, &objf, &options, NAGCOMM_NULL, &fail);
  if (strcmp(outfile, "stdout"))
    {
      fpout = fopen(outfile, "a");
    }
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_opt_lin_lsq (e04ncc).\n%s\n",
              fail.message);
      exit_status = 1;
    }

  /* Free options memory */
  /* nag_opt_free (e04xzc).
   * Memory freeing function for use with option setting
   */
  nag_opt_free(&options, "all", &fail);
  if (fail.code != NE_NOERROR)
    {
      fprintf(fpout, "Error from nag_opt_free (e04xzc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (a) NAG_FREE(a);
  if (bl) NAG_FREE(bl);
  if (bu) NAG_FREE(bu);
  if (cvec) NAG_FREE(cvec);
  if (h) NAG_FREE(h);
  if (x) NAG_FREE(x);
  if (kx) NAG_FREE(kx);
  if (optionsfile) NAG_FREE(optionsfile);
  if (outfile) NAG_FREE(outfile);

  return exit_status;
}