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src/lemon/lp_glpk.cc
author alpar
Fri, 08 Apr 2005 15:46:12 +0000
changeset 1329 1bfaec33215b
parent 1321 bc3a4c498eb2
child 1359 1581f961cfaa
permissions -rw-r--r--
- Insert LP stuff into the module structure 
     1 /* -*- C++ -*-

     2  * src/lemon/lp_glpk.cc - Part of LEMON, a generic C++ optimization library

     3  *

     4  * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

     5  * (Egervary Combinatorial Optimization Research Group, EGRES).

     6  *

     7  * Permission to use, modify and distribute this software is granted

     8  * provided that this copyright notice appears in all copies. For

     9  * precise terms see the accompanying LICENSE file.

    10  *

    11  * This software is provided "AS IS" with no warranty of any kind,

    12  * express or implied, and with no claim as to its suitability for any

    13  * purpose.

    14  *

    15  */

    16 

    17 #ifndef LEMON_LP_GLPK_CC

    18 #define LEMON_LP_GLPK_CC

    19 

    20 ///\file

    21 ///\brief Implementation of the LEMON-GLPK lp solver interface.

    22 

    23 #include <lemon/lp_glpk.h>

    24 

    25 namespace lemon {

    26 

    27   LpGlpk::LpGlpk() : Parent(), 

    28 		     lp(lpx_create_prob()) {

    29     ///\todo constrol function for this:

    30     lpx_set_int_parm(lp, LPX_K_DUAL, 1);

    31     messageLevel(0);

    32   }

    33   

    34   LpGlpk::~LpGlpk() {

    35     lpx_delete_prob(lp);

    36   }

    37   

    38   int LpGlpk::_addCol() { 

    39     int i=lpx_add_cols(lp, 1);

    40     _setColLowerBound(i, -INF);

    41     _setColUpperBound(i, INF);

    42     return i;

    43   }

    44 

    45   int LpGlpk::_addRow() { 

    46     int i=lpx_add_rows(lp, 1);

    47     return i;

    48   }

    49 

    50   

    51   void LpGlpk::_setRowCoeffs(int i, 

    52 			     int length,

    53 			     const int   * indices, 

    54 			     const Value   * values )

    55   {

    56     lpx_set_mat_row(lp, i, length,

    57 		    const_cast<int * >(indices) ,

    58 		    const_cast<Value * >(values));

    59   }

    60   

    61   void LpGlpk::_setColCoeffs(int i, 

    62 			     int length,

    63 			     const int   * indices, 

    64 			     const Value   * values)

    65   {

    66     lpx_set_mat_col(lp, i, length,

    67 		    const_cast<int * >(indices),

    68 		    const_cast<Value * >(values));

    69   }

    70   

    71   void LpGlpk::_setColLowerBound(int i, Value lo)

    72   {

    73     if (lo==INF) {

    74       //FIXME error

    75     }

    76     int b=lpx_get_col_type(lp, i);

    77     double up=lpx_get_col_ub(lp, i);	

    78     if (lo==-INF) {

    79       switch (b) {

    80       case LPX_FR:

    81       case LPX_LO:

    82 	lpx_set_col_bnds(lp, i, LPX_FR, lo, up);

    83 	break;

    84       case LPX_UP:

    85 	break;

    86       case LPX_DB:

    87       case LPX_FX:

    88 	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);

    89 	break;

    90       default: ;

    91 	//FIXME error

    92       }

    93     } else {

    94       switch (b) {

    95       case LPX_FR:

    96       case LPX_LO:

    97 	lpx_set_col_bnds(lp, i, LPX_LO, lo, up);

    98 	break;

    99       case LPX_UP:	  

   100       case LPX_DB:

   101       case LPX_FX:

   102 	if (lo==up) 

   103 	  lpx_set_col_bnds(lp, i, LPX_FX, lo, up);

   104 	else 

   105 	  lpx_set_col_bnds(lp, i, LPX_DB, lo, up);

   106 	break;

   107       default: ;

   108 	//FIXME error

   109       }

   110     }

   111 

   112   }

   113   

   114   void LpGlpk::_setColUpperBound(int i, Value up)

   115   {

   116     if (up==-INF) {

   117       //FIXME error

   118     }

   119     int b=lpx_get_col_type(lp, i);

   120     double lo=lpx_get_col_lb(lp, i);

   121     if (up==INF) {

   122       switch (b) {

   123       case LPX_FR:

   124       case LPX_LO:

   125 	break;

   126       case LPX_UP:

   127 	lpx_set_col_bnds(lp, i, LPX_FR, lo, up);

   128 	break;

   129       case LPX_DB:

   130       case LPX_FX:

   131 	lpx_set_col_bnds(lp, i, LPX_LO, lo, up);

   132 	break;

   133       default: ;

   134 	//FIXME error

   135       }

   136     } else {

   137       switch (b) {

   138       case LPX_FR:

   139 	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);

   140 	break;

   141       case LPX_UP:

   142 	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);

   143 	break;

   144       case LPX_LO:

   145       case LPX_DB:

   146       case LPX_FX:

   147 	if (lo==up) 

   148 	  lpx_set_col_bnds(lp, i, LPX_FX, lo, up);

   149 	else 

   150 	  lpx_set_col_bnds(lp, i, LPX_DB, lo, up);

   151 	break;

   152       default: ;

   153 	//FIXME error

   154       }

   155     }

   156   }

   157   

   158   void LpGlpk::_setRowLowerBound(int i, Value lo)

   159   {

   160     if (lo==INF) {

   161       //FIXME error

   162     }

   163     int b=lpx_get_row_type(lp, i);

   164     double up=lpx_get_row_ub(lp, i);	

   165     if (lo==-INF) {

   166       switch (b) {

   167       case LPX_FR:

   168       case LPX_LO:

   169 	lpx_set_row_bnds(lp, i, LPX_FR, lo, up);

   170 	break;

   171       case LPX_UP:

   172 	break;

   173       case LPX_DB:

   174       case LPX_FX:

   175 	lpx_set_row_bnds(lp, i, LPX_UP, lo, up);

   176 	break;

   177       default: ;

   178 	//FIXME error

   179       }

   180     } else {

   181       switch (b) {

   182       case LPX_FR:

   183       case LPX_LO:

   184 	lpx_set_row_bnds(lp, i, LPX_LO, lo, up);

   185 	break;

   186       case LPX_UP:	  

   187       case LPX_DB:

   188       case LPX_FX:

   189 	if (lo==up) 

   190 	  lpx_set_row_bnds(lp, i, LPX_FX, lo, up);

   191 	else 

   192 	  lpx_set_row_bnds(lp, i, LPX_DB, lo, up);

   193 	break;

   194       default: ;

   195 	//FIXME error

   196       }

   197     }

   198   }

   199   

   200   void LpGlpk::_setRowUpperBound(int i, Value up)

   201   {

   202     if (up==-INF) {

   203       //FIXME error

   204     }

   205     int b=lpx_get_row_type(lp, i);

   206     double lo=lpx_get_row_lb(lp, i);

   207     if (up==INF) {

   208       switch (b) {

   209       case LPX_FR:

   210       case LPX_LO:

   211 	break;

   212       case LPX_UP:

   213 	lpx_set_row_bnds(lp, i, LPX_FR, lo, up);

   214 	break;

   215       case LPX_DB:

   216       case LPX_FX:

   217 	lpx_set_row_bnds(lp, i, LPX_LO, lo, up);

   218 	break;

   219       default: ;

   220 	//FIXME error

   221       }

   222     } else {

   223       switch (b) {

   224       case LPX_FR:

   225 	lpx_set_row_bnds(lp, i, LPX_UP, lo, up);

   226 	break;

   227       case LPX_UP:

   228 	lpx_set_row_bnds(lp, i, LPX_UP, lo, up);

   229 	break;

   230       case LPX_LO:

   231       case LPX_DB:

   232       case LPX_FX:

   233 	if (lo==up) 

   234 	  lpx_set_row_bnds(lp, i, LPX_FX, lo, up);

   235 	else 

   236 	  lpx_set_row_bnds(lp, i, LPX_DB, lo, up);

   237 	break;

   238       default: ;

   239 	//FIXME error

   240       }

   241     }

   242   }

   243   

   244   void LpGlpk::_setObjCoeff(int i, Value obj_coef)

   245   {

   246     lpx_set_obj_coef(lp, i, obj_coef);

   247   }

   248 

   249 

   250   LpGlpk::SolveExitStatus LpGlpk::_solve()

   251   {

   252     int i=  lpx_simplex(lp);

   253     switch (i) {

   254     case LPX_E_OK: 

   255       return SOLVED;

   256       break;

   257     default:

   258       return UNSOLVED;

   259     }

   260   }

   261 

   262   LpGlpk::Value LpGlpk::_getPrimal(int i)

   263   {

   264     return lpx_get_col_prim(lp,i);

   265   }

   266   

   267   LpGlpk::Value LpGlpk::_getPrimalValue()

   268   {

   269     return lpx_get_obj_val(lp);

   270   }

   271   

   272  

   273   LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus()

   274   {

   275     int stat=  lpx_get_status(lp);

   276     switch (stat) {

   277     case LPX_UNDEF://Undefined (no solve has been run yet)

   278       return UNDEFINED;

   279       break;

   280     case LPX_NOFEAS://There is no feasible solution (primal, I guess)

   281     case LPX_INFEAS://Infeasible 

   282       return INFEASIBLE;

   283       break;

   284     case LPX_UNBND://Unbounded

   285       return INFINITE;

   286       break;

   287     case LPX_FEAS://Feasible

   288       return FEASIBLE;

   289       break;

   290     case LPX_OPT://Feasible

   291       return OPTIMAL;

   292       break;

   293     default:

   294       return UNDEFINED; //to avoid gcc warning

   295       //FIXME error

   296     }

   297   }

   298 

   299 

   300   void LpGlpk::_setMax()

   301   {

   302     lpx_set_obj_dir(lp, LPX_MAX);

   303   }

   304 

   305   void LpGlpk::_setMin()

   306   {

   307     lpx_set_obj_dir(lp, LPX_MIN);

   308   }

   309 

   310  

   311   void LpGlpk::messageLevel(int m)

   312   {

   313     lpx_set_int_parm(lp, LPX_K_MSGLEV, m);

   314   }

   315 

   316   void LpGlpk::presolver(bool b)

   317   {

   318     lpx_set_int_parm(lp, LPX_K_PRESOL, b);

   319   }

   320 

   321  

   322 } //END OF NAMESPACE LEMON

   323 

   324 #endif //LEMON_LP_GLPK_CC
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