/* nag_opt_sparse_mps_read (e04mzc) 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 <nag_string.h>
#include <nage04.h>

#ifdef __cplusplus
extern "C" {
#endif
  static void qphess(Integer ncolh, double x[], double hx[], Nag_Comm *comm);
#ifdef __cplusplus
}
#endif

static int ex1(void);
static int ex2(void);


int main(void)
{
  Integer exit_status_ex1=0;
  Integer exit_status_ex2=0;

  /* Two examples are called: ex1() uses the
   * default settings to read an MPSX file and
   * solve the problem, while ex2() uses the
   * options structure to obtain the column
   * and row names.
   */
  Vprintf("nag_opt_sparse_mps_read (e04mzc) Example Program Results.\n");

  exit_status_ex1 = ex1();
  exit_status_ex2 = ex2();

  return exit_status_ex1 == 0 && exit_status_ex2 == 0 ? 0 : 1;
}

static int ex1(void)
{
  Integer exit_status=0, *ha, iobj, *ka, m, n, ncolh, ninf, nnz;
  NagError fail;
  double *a, *bl, *bu, obj, sinf, *xs;

  INIT_FAIL(fail);

  Vprintf("\nExample 1: default options used.\n");

  /* Read the MPSX file */
  /* nag_opt_sparse_mps_read (e04mzc).
   * Read MPSX data for sparse LP or QP problem from a file
   */
  nag_opt_sparse_mps_read((char*)0, &n, &m, &nnz, &iobj, &a, &ha, &ka, &bl, &bu,
                          &xs, E04_DEFAULT, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_opt_sparse_mps_read (e04mzc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

  /* Solve the problem */
  ncolh = 5;
  /* nag_opt_sparse_convex_qp (e04nkc).
   * Solves sparse linear programming or convex quadratic
   * programming problems
   */
  nag_opt_sparse_convex_qp(n, m, nnz, iobj, ncolh, qphess, a, ha, ka, bl, bu,
                           xs, &ninf, &sinf, &obj, E04_DEFAULT, NAGCOMM_NULL,
                           &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_opt_sparse_convex_qp (e04nkc).\n%s\n",
              fail.message);
      exit_status = 1;
    }


  /* Free the memory allocated by nag_opt_sparse_mps_read (e04mzc) */
  /* nag_opt_sparse_mps_free (e04myc).
   * Free memory allocated by nag_opt_sparse_mps_read (e04mzc)
   */
  nag_opt_sparse_mps_free(&a, &ha, &ka, &bl, &bu, &xs);
 END:
  return exit_status;

}
static void qphess(Integer ncolh, double x[], double hx[], Nag_Comm *comm)
{
  /* Function to compute H*x. */
  hx[0] = 2.0*x[0] + x[1] + x[2] + x[3] + x[4];
  hx[1] = x[0] + 2.0*x[1] + x[2] + x[3] + x[4];
  hx[2] = x[0] + x[1] + 2.0*x[2] + x[3] + x[4];
  hx[3] = x[0] + x[1] + x[2] + 2.0*x[3] + x[4];
  hx[4] = x[0] + x[1] + x[2] + x[3] + 2.0*x[4];
}  /* qphess */


/* Example 2 */

static int ex2(void)
{
  Integer exit_status=0, *ha, iobj, *ka, m, n, ncolh, ninf, nnz;
  NagError fail;
  Nag_E04_Opt options;
  double *a, *bl, *bu, obj, sinf, *xs;

  INIT_FAIL(fail);


  Vprintf("\nExample 2: use of options structure.\n");

  /* Initialise the options structure and read MPSX data */
  /* nag_opt_init (e04xxc).
   * Initialization function for option setting
   */
  nag_opt_init(&options);
  Vstrcpy(options.prob_name, "..QP 2..");
  Vstrcpy(options.obj_name, "..COST..");
  /* nag_opt_sparse_mps_read (e04mzc), see above. */
  nag_opt_sparse_mps_read((char*)0, &n, &m, &nnz, &iobj, &a, &ha, &ka, &bl, &bu,
                          &xs, &options, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_opt_sparse_mps_read (e04mzc).\n%s\n",
              fail.message);
      exit_status = 1;
      goto END;
    }

  /* Column and row names are now available via options */

  ncolh = 5;
  /* nag_opt_sparse_convex_qp (e04nkc), see above. */
  nag_opt_sparse_convex_qp(n, m, nnz, iobj, ncolh, qphess, a, ha, ka, bl, bu,
                           xs, &ninf, &sinf, &obj, &options, NAGCOMM_NULL,
                           &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_opt_sparse_convex_qp (e04nkc).\n%s\n",
              fail.message);
      exit_status = 1;
    }

  /* Free memory returned by nag_opt_sparse_mps_read (e04mzc) */
  /* nag_opt_sparse_mps_free (e04myc), see above. */
  nag_opt_sparse_mps_free(&a, &ha, &ka, &bl, &bu, &xs);

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