Exemplo n.º 1
0
LPX *lpx_read_model(char *model, char *data, char *output)
{     LPX *lp = NULL;
      MPL *mpl;
      int ret;
      /* create and initialize the translator database */
      mpl = mpl_initialize();
      /* read model section and optional data section */
      ret = mpl_read_model(mpl, model, data != NULL);
      if (ret == 4) goto done;
      insist(ret == 1 || ret == 2);
      /* read data section, if necessary */
      if (data != NULL)
      {  insist(ret == 1);
         ret = mpl_read_data(mpl, data);
         if (ret == 4) goto done;
         insist(ret == 2);
      }
      /* generate model */
      ret = mpl_generate(mpl, output);
      if (ret == 4) goto done;
      insist(ret == 3);
      /* extract problem instance */
      lp = lpx_extract_prob(mpl);
done: /* free resources used by the model translator */
      mpl_terminate(mpl);
      return lp;
}
Exemplo n.º 2
0
int glp_mpl_read_model(glp_tran *tran, const char *fname, int skip)
{     /* read and translate model section */
      int ret;
      if (tran->phase != 0)
         xerror("glp_mpl_read_model: invalid call sequence\n");
      ret = mpl_read_model(tran, (char *)fname, skip);
      if (ret == 1 || ret == 2)
         ret = 0;
      else if (ret == 4)
         ret = 1;
      else
         xassert(ret != ret);
      return ret;
}
Exemplo n.º 3
0
int main(int argc, char *argv[])
{     LPX *lp;
      MPL *mpl = NULL;
      int ret;
      double start;
      /* parse command line parameters */
      parse_cmdline(argc, argv);
      /* remove all output files specified in the command line */
      if (display != NULL) remove(display);
      if (out_sol != NULL) remove(out_sol);
      if (out_bnds != NULL) remove(out_bnds);
      if (out_mps != NULL) remove(out_mps);
      if (out_lpt != NULL) remove(out_lpt);
      if (out_txt != NULL) remove(out_txt);
      if (out_glp != NULL) remove(out_glp);
      /* read problem from the input file */
      if (in_file == NULL)
      {  print("No input file specified; try %s --help", argv[0]);
         exit(EXIT_FAILURE);
      }
      switch (format)
      {  case 0:
            lp = lpx_read_mps(in_file);
            if (lp == NULL)
            {  print("MPS file processing error");
               exit(EXIT_FAILURE);
            }
            break;
         case 1:
            lp = lpx_read_lpt(in_file);
            if (lp == NULL)
            {  print("CPLEX LP file processing error");
               exit(EXIT_FAILURE);
            }
            break;
         case 2:
#if 0 /* 01/VIII-2004 */
            lp = lpx_read_model(in_file, in_data, display);
            if (lp == NULL)
            {  print("Model processing error");
               exit(EXIT_FAILURE);
            }
#else
            /* initialize the translator database */
            mpl = mpl_initialize();
            /* read model section and optional data section */
            ret = mpl_read_model(mpl, in_file, in_data != NULL);
            if (ret == 4)
err:        {  print("Model processing error");
               exit(EXIT_FAILURE);
            }
            insist(ret == 1 || ret == 2);
            /* read data section, if necessary */
            if (in_data != NULL)
            {  insist(ret == 1);
               ret = mpl_read_data(mpl, in_data);
               if (ret == 4) goto err;
               insist(ret == 2);
            }
            /* generate model */
            ret = mpl_generate(mpl, display);
            if (ret == 4) goto err;
            /* extract problem instance */
            lp = lpx_extract_prob(mpl);
            insist(lp != NULL);
#endif
            if (lpx_get_num_rows(lp) == 0)
            {  print("Problem has no rows");
               exit(EXIT_FAILURE);
            }
            if (lpx_get_num_cols(lp) == 0)
            {  print("Problem has no columns");
               exit(EXIT_FAILURE);
            }
            break;
         case 3:
            lp = lpx_read_prob(in_file);
            if (lp == NULL)
            {  print("GNU LP file processing error");
               exit(EXIT_FAILURE);
            }
            break;
         default:
            insist(format != format);
      }
      /* change problem name (if required) */
      if (newname != NULL) lpx_set_prob_name(lp, newname);
      /* change optimization direction (if required) */
      if (dir != 0) lpx_set_obj_dir(lp, dir);
      /* write problem in MPS format (if required) */
      if (out_mps != NULL)
      {  lpx_set_int_parm(lp, LPX_K_MPSORIG, orig);
         ret = lpx_write_mps(lp, out_mps);
         if (ret != 0)
         {  print("Unable to write problem in MPS format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in CPLEX LP format (if required) */
      if (out_lpt != NULL)
      {  lpx_set_int_parm(lp, LPX_K_LPTORIG, orig);
         ret = lpx_write_lpt(lp, out_lpt);
         if (ret != 0)
         {  print("Unable to write problem in CPLEX LP format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in plain text format (if required) */
      if (out_txt != NULL)
      {  lpx_set_int_parm(lp, LPX_K_LPTORIG, orig);
         ret = lpx_print_prob(lp, out_txt);
         if (ret != 0)
         {  print("Unable to write problem in plain text format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in GNU LP format (if required) */
      if (out_glp != NULL)
      {  ret = lpx_write_prob(lp, out_glp);
         if (ret != 0)
         {  print("Unable to write problem in GNU LP format");
            exit(EXIT_FAILURE);
         }
      }
      /* if only data check is required, skip computations */
      if (check) goto skip;
      /* scale the problem data (if required) */
      if (scale && (!presol || method == 1)) lpx_scale_prob(lp);
      /* build advanced initial basis (if required) */
      if (method == 0 && basis && !presol) lpx_adv_basis(lp);
      /* set some control parameters, which might be changed in the
         command line */
      lpx_set_int_parm(lp, LPX_K_PRICE, price);
      if (!relax) lpx_set_real_parm(lp, LPX_K_RELAX, 0.0);
      lpx_set_int_parm(lp, LPX_K_PRESOL, presol);
      lpx_set_int_parm(lp, LPX_K_BRANCH, branch);
      lpx_set_int_parm(lp, LPX_K_BTRACK, btrack);
      lpx_set_real_parm(lp, LPX_K_TMLIM, (double)tmlim);
      /* solve the problem */
      start = utime();
      switch (method)
      {  case 0:
            if (nomip || lpx_get_class(lp) == LPX_LP)
            {  ret = lpx_simplex(lp);
               if (presol && ret != LPX_E_OK && out_sol != NULL)
                  print("If you need actual output for non-optimal solu"
                     "tion, use --nopresol");
            }
            else
            {  method = 2;
               lpx_simplex(lp);
               if (!intopt)
                  lpx_integer(lp);
               else
                  lpx_intopt(lp);
            }
            break;
         case 1:
            if (nomip || lpx_get_class(lp) == LPX_LP)
               lpx_interior(lp);
            else
            {  print("Interior point method is not able to solve MIP pr"
                  "oblem; use --simplex");
               exit(EXIT_FAILURE);
            }
            break;
         default:
            insist(method != method);
      }
      /* display statistics */
      print("Time used:   %.1f secs", utime() - start);
      print("Memory used: %.1fM (%d bytes)",
         (double)lib_env_ptr()->mem_tpeak / (double)(1024 * 1024),
         lib_env_ptr()->mem_tpeak);
#if 1 /* 01/VIII-2004 */
      if (mpl != NULL && mpl_has_solve_stmt(mpl))
      {  int n, j, round;
         /* store the solution to the translator database */
         n = lpx_get_num_cols(lp);
         round = lpx_get_int_parm(lp, LPX_K_ROUND);
         lpx_set_int_parm(lp, LPX_K_ROUND, 1);
         switch (method)
         {  case 0:
               for (j = 1; j <= n; j++)
                  mpl_put_col_value(mpl, j, lpx_get_col_prim(lp, j));
               break;
            case 1:
               for (j = 1; j <= n; j++)
                  mpl_put_col_value(mpl, j, lpx_ipt_col_prim(lp, j));
               break;
            case 2:
               for (j = 1; j <= n; j++)
                  mpl_put_col_value(mpl, j, lpx_mip_col_val(lp, j));
               break;
            default:
               insist(method != method);
         }
         lpx_set_int_parm(lp, LPX_K_ROUND, round);
         /* perform postsolving */
         ret = mpl_postsolve(mpl, display);
         if (ret == 4)
         {  print("Model postsolving error");
            exit(EXIT_FAILURE);
         }
         insist(ret == 3);
      }
#endif
      /* write problem solution found by the solver (if required) */
      if (out_sol != NULL)
      {  switch (method)
         {  case 0:
               ret = lpx_print_sol(lp, out_sol);
               break;
            case 1:
               ret = lpx_print_ips(lp, out_sol);
               break;
            case 2:
               ret = lpx_print_mip(lp, out_sol);
               break;
            default:
               insist(method != method);
         }
         if (ret != 0)
         {  print("Unable to write problem solution");
            exit(EXIT_FAILURE);
         }
      }
      /* write sensitivity bounds information (if required) */
      if (out_bnds != NULL)
      {  if (method != 0)
         {  print("Cannot write sensitivity bounds information for inte"
               "rior-point or MIP solution");
            exit(EXIT_FAILURE);
         }
         ret = lpx_print_sens_bnds(lp, out_bnds);
         if (ret != 0)
         {  print("Unable to write sensitivity bounds information");
            exit(EXIT_FAILURE);
         }
      }
skip: /* delete the problem object */
      lpx_delete_prob(lp);
#if 1 /* 01/VIII-2004 */
      /* if the translator database exists, destroy it */
      if (mpl != NULL) mpl_terminate(mpl);
#endif
      /* check that no memory blocks are still allocated */
      insist(lib_env_ptr()->mem_total == 0);
      insist(lib_env_ptr()->mem_count == 0);
      /* return to the control program */
      return 0;
}
Exemplo n.º 4
0
int main(int argc, char *argv[])
{     LPX *lp;
      MPL *mpl = NULL;
      int ret;
      ulong_t start;
      /* parse command line parameters */
      parse_cmdline(argc, argv);
      /* set available memory limit */
      if (memlim >= 0)
         lib_mem_limit(ulmul(ulset(0, 1048576), ulset(0, memlim)));
      /* remove all output files specified in the command line */
      if (display != NULL) remove(display);
      if (out_bas != NULL) remove(out_bas);
      if (out_sol != NULL) remove(out_sol);
      if (out_bnds != NULL) remove(out_bnds);
      if (out_mps != NULL) remove(out_mps);
      if (out_freemps != NULL) remove(out_freemps);
      if (out_cpxlp != NULL) remove(out_cpxlp);
      if (out_txt != NULL) remove(out_txt);
      if (out_glp != NULL) remove(out_glp);
      if (log_file != NULL) remove(log_file);
      /* open hardcopy file, if necessary */
      if (log_file != NULL)
      {  if (lib_open_log(log_file))
         {  print("Unable to create log file");
            exit(EXIT_FAILURE);
         }
      }
      /* read problem data from the input file */
      if (in_file == NULL)
      {  print("No input file specified; try %s --help", argv[0]);
         exit(EXIT_FAILURE);
      }
      switch (format)
      {  case 0:
            lp = lpx_read_mps(in_file);
            if (lp == NULL)
            {  print("MPS file processing error");
               exit(EXIT_FAILURE);
            }
            orig = 1;
            break;
         case 1:
            lp = lpx_read_cpxlp(in_file);
            if (lp == NULL)
            {  print("CPLEX LP file processing error");
               exit(EXIT_FAILURE);
            }
            break;
         case 2:
            /* initialize the translator database */
            mpl = mpl_initialize();
            /* read model section and optional data section */
            ret = mpl_read_model(mpl, in_file, in_data != NULL);
            if (ret == 4)
err:        {  print("Model processing error");
               exit(EXIT_FAILURE);
            }
            xassert(ret == 1 || ret == 2);
            /* read data section, if necessary */
            if (in_data != NULL)
            {  xassert(ret == 1);
               ret = mpl_read_data(mpl, in_data);
               if (ret == 4) goto err;
               xassert(ret == 2);
            }
            /* generate model */
            ret = mpl_generate(mpl, display);
            if (ret == 4) goto err;
            /* extract problem instance */
            lp = lpx_extract_prob(mpl);
            xassert(lp != NULL);
            break;
         case 3:
            lp = lpx_read_prob(in_file);
            if (lp == NULL)
            {  print("GNU LP file processing error");
               exit(EXIT_FAILURE);
            }
            break;
         case 4:
            lp = lpx_read_freemps(in_file);
            if (lp == NULL)
            {  print("MPS file processing error");
               exit(EXIT_FAILURE);
            }
            break;
         default:
            xassert(format != format);
      }
      /* order rows and columns of the constraint matrix */
      lpx_order_matrix(lp);
      /* change problem name (if required) */
      if (newname != NULL) lpx_set_prob_name(lp, newname);
      /* change optimization direction (if required) */
      if (dir != 0) lpx_set_obj_dir(lp, dir);
      /* write problem in fixed MPS format (if required) */
      if (out_mps != NULL)
      {  lpx_set_int_parm(lp, LPX_K_MPSORIG, orig);
         ret = lpx_write_mps(lp, out_mps);
         if (ret != 0)
         {  print("Unable to write problem in fixed MPS format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in free MPS format (if required) */
      if (out_freemps != NULL)
      {  ret = lpx_write_freemps(lp, out_freemps);
         if (ret != 0)
         {  print("Unable to write problem in free MPS format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in CPLEX LP format (if required) */
      if (out_cpxlp != NULL)
      {  ret = lpx_write_cpxlp(lp, out_cpxlp);
         if (ret != 0)
         {  print("Unable to write problem in CPLEX LP format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in plain text format (if required) */
      if (out_txt != NULL)
      {  lpx_set_int_parm(lp, LPX_K_LPTORIG, orig);
         ret = lpx_print_prob(lp, out_txt);
         if (ret != 0)
         {  print("Unable to write problem in plain text format");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem in GNU LP format (if required) */
      if (out_glp != NULL)
      {  ret = lpx_write_prob(lp, out_glp);
         if (ret != 0)
         {  print("Unable to write problem in GNU LP format");
            exit(EXIT_FAILURE);
         }
      }
      /* if only data check is required, skip computations */
      if (check) goto skip;
      /* scale the problem data (if required) */
      if (scale && (!presol || method == 1)) lpx_scale_prob(lp);
      /* build initial LP basis */
      if (method == 0 && !presol && in_bas == NULL)
      {  switch (basis)
         {  case 0:
               lpx_std_basis(lp);
               break;
            case 1:
               if (lpx_get_num_rows(lp) > 0 && lpx_get_num_cols(lp) > 0)
                  lpx_adv_basis(lp);
               break;
            case 2:
               if (lpx_get_num_rows(lp) > 0 && lpx_get_num_cols(lp) > 0)
                  lpx_cpx_basis(lp);
               break;
            default:
               xassert(basis != basis);
         }
      }
      /* or read initial basis from input text file in MPS format */
      if (in_bas != NULL)
      {  if (method != 0)
         {  print("Initial LP basis is useless for interior-point solve"
               "r and therefore ignored");
            goto nobs;
         }
         lpx_set_int_parm(lp, LPX_K_MPSORIG, orig);
         ret = lpx_read_bas(lp, in_bas);
         if (ret != 0)
         {  print("Unable to read initial LP basis");
            exit(EXIT_FAILURE);
         }
         if (presol)
         {  presol = 0;
            print("LP presolver disabled because initial LP basis has b"
               "een provided");
         }
nobs:    ;
      }
      /* set some control parameters, which might be changed in the
         command line */
      lpx_set_int_parm(lp, LPX_K_BFTYPE, bf_type);
      lpx_set_int_parm(lp, LPX_K_PRICE, price);
      if (!relax) lpx_set_real_parm(lp, LPX_K_RELAX, 0.0);
      lpx_set_int_parm(lp, LPX_K_PRESOL, presol);
      lpx_set_int_parm(lp, LPX_K_BRANCH, branch);
      lpx_set_int_parm(lp, LPX_K_BTRACK, btrack);
      lpx_set_real_parm(lp, LPX_K_TMLIM, (double)tmlim);
      lpx_set_int_parm(lp, LPX_K_BINARIZE, binarize);
      lpx_set_int_parm(lp, LPX_K_USECUTS, use_cuts);
      /* solve the problem */
      start = xtime();
      switch (method)
      {  case 0:
            if (nomip || lpx_get_class(lp) == LPX_LP)
            {  ret = (!exact ? lpx_simplex(lp) : lpx_exact(lp));
               if (xcheck)
               {  if (!presol || ret == LPX_E_OK)
                     lpx_exact(lp);
                  else
                     print("If you need checking final basis for non-op"
                        "timal solution, use --nopresol");
               }
               if (presol && ret != LPX_E_OK && (out_bas != NULL ||
                  out_sol != NULL))
                  print("If you need actual output for non-optimal solu"
                     "tion, use --nopresol");
            }
            else
            {  method = 2;
               if (!intopt)
               {  ret = (!exact ? lpx_simplex(lp) : lpx_exact(lp));
                  if (xcheck && (!presol || ret == LPX_E_OK))
                     lpx_exact(lp);
                  lpx_integer(lp);
               }
               else
                  lpx_intopt(lp);
            }
            break;
         case 1:
            if (nomip || lpx_get_class(lp) == LPX_LP)
               lpx_interior(lp);
            else
            {  print("Interior-point method is not able to solve MIP pr"
                  "oblem; use --simplex");
               exit(EXIT_FAILURE);
            }
            break;
         default:
            xassert(method != method);
      }
      /* display statistics */
      print("Time used:   %.1f secs", xdifftime(xtime(), start));
      {  ulong_t tpeak;
         char buf[50];
         lib_mem_usage(NULL, NULL, NULL, &tpeak);
         print("Memory used: %.1f Mb (%s bytes)",
            (4294967296.0 * tpeak.hi + tpeak.lo) / 1048576.0,
            ultoa(tpeak, buf, 10));
      }
      if (mpl != NULL && mpl_has_solve_stmt(mpl))
      {  int n, j, round;
         /* store the solution to the translator database */
         n = lpx_get_num_cols(lp);
         round = lpx_get_int_parm(lp, LPX_K_ROUND);
         lpx_set_int_parm(lp, LPX_K_ROUND, 1);
         switch (method)
         {  case 0:
               for (j = 1; j <= n; j++)
                  mpl_put_col_value(mpl, j, lpx_get_col_prim(lp, j));
               break;
            case 1:
               for (j = 1; j <= n; j++)
                  mpl_put_col_value(mpl, j, lpx_ipt_col_prim(lp, j));
               break;
            case 2:
               for (j = 1; j <= n; j++)
                  mpl_put_col_value(mpl, j, lpx_mip_col_val(lp, j));
               break;
            default:
               xassert(method != method);
         }
         lpx_set_int_parm(lp, LPX_K_ROUND, round);
         /* perform postsolving */
         ret = mpl_postsolve(mpl);
         if (ret == 4)
         {  print("Model postsolving error");
            exit(EXIT_FAILURE);
         }
         xassert(ret == 3);
      }
      /* write final LP basis (if required) */
      if (out_bas != NULL)
      {  lpx_set_int_parm(lp, LPX_K_MPSORIG, orig);
         ret = lpx_write_bas(lp, out_bas);
         if (ret != 0)
         {  print("Unable to write final LP basis");
            exit(EXIT_FAILURE);
         }
      }
      /* write problem solution found by the solver (if required) */
      if (out_sol != NULL)
      {  switch (method)
         {  case 0:
               ret = lpx_print_sol(lp, out_sol);
               break;
            case 1:
               ret = lpx_print_ips(lp, out_sol);
               break;
            case 2:
               ret = lpx_print_mip(lp, out_sol);
               break;
            default:
               xassert(method != method);
         }
         if (ret != 0)
         {  print("Unable to write problem solution");
            exit(EXIT_FAILURE);
         }
      }
      /* write sensitivity bounds information (if required) */
      if (out_bnds != NULL)
      {  if (method != 0)
         {  print("Cannot write sensitivity bounds information for inte"
               "rior-point or MIP solution");
            exit(EXIT_FAILURE);
         }
         ret = lpx_print_sens_bnds(lp, out_bnds);
         if (ret != 0)
         {  print("Unable to write sensitivity bounds information");
            exit(EXIT_FAILURE);
         }
      }
skip: /* delete the problem object */
      lpx_delete_prob(lp);
      /* if the translator database exists, destroy it */
      if (mpl != NULL) mpl_terminate(mpl);
      xassert(gmp_pool_count() == 0);
      gmp_free_mem();
      /* close the hardcopy file */
      if (log_file != NULL) lib_close_log();
      /* check that no memory blocks are still allocated */
      {  int count;
         ulong_t total;
         lib_mem_usage(&count, NULL, &total, NULL);
         xassert(count == 0);
         xassert(total.lo == 0 && total.hi == 0);
      }
      /* free the library environment */
      lib_free_env();
      /* return to the control program */
      return 0;
}