lemon-0.x: src/lemon/lp_glpk.cc@8de0c1aeeb32

     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 Research Group on Combinatorial Optimization, 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  */

    17 #ifndef LEMON_LP_GLPK_CC

    18 #define LEMON_LP_GLPK_CC

    20 ///\file

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

    23 #include <lemon/lp_glpk.h>

    25 namespace lemon {

    27   ///\e

    29   ///\bug Unimplemented!

    30   ///

    31   LpSolverBase &LpGlpk::_newLp()

    32   {

    33     LpSolverBase *tmp=0;

    34     return *tmp;

    35   }

    37   ///\e

    39   ///\bug Unimplemented!

    40   ///

    41   LpSolverBase &LpGlpk::_copyLp()

    42   {

    43     LpSolverBase *tmp=0;

    44     return *tmp;

    45   }

    47   LpGlpk::LpGlpk() : Parent(),

    48 		     lp(lpx_create_prob()) {

    49     ///\todo constrol function for this:

    50     lpx_set_int_parm(lp, LPX_K_DUAL, 1);

    51     messageLevel(0);

    52   }

    54   LpGlpk::~LpGlpk() {

    55     lpx_delete_prob(lp);

    56   }

    58   int LpGlpk::_addCol() {

    59     int i=lpx_add_cols(lp, 1);

    60     _setColLowerBound(i, -INF);

    61     _setColUpperBound(i, INF);

    62     return i;

    63   }

    65   int LpGlpk::_addRow() {

    66     int i=lpx_add_rows(lp, 1);

    67     return i;

    68   }

    71   void LpGlpk::_setRowCoeffs(int i,

    72 			     int length,

    73 			     const int   * indices,

    74 			     const Value   * values )

    75   {

    76     lpx_set_mat_row(lp, i, length,

    77 		    const_cast<int * >(indices) ,

    78 		    const_cast<Value * >(values));

    79   }

    81   void LpGlpk::_setColCoeffs(int i,

    82 			     int length,

    83 			     const int   * indices,

    84 			     const Value   * values)

    85   {

    86     lpx_set_mat_col(lp, i, length,

    87 		    const_cast<int * >(indices),

    88 		    const_cast<Value * >(values));

    89   }

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

    92   {

    93     if (lo==INF) {

    94       //FIXME error

    95     }

    96     int b=lpx_get_col_type(lp, i);

    97     double up=lpx_get_col_ub(lp, i);

    98     if (lo==-INF) {

    99       switch (b) {

   100       case LPX_FR:

   101       case LPX_LO:

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

   103 	break;

   104       case LPX_UP:

   105 	break;

   106       case LPX_DB:

   107       case LPX_FX:

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

   109 	break;

   110       default: ;

   111 	//FIXME error

   112       }

   113     } else {

   114       switch (b) {

   115       case LPX_FR:

   116       case LPX_LO:

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

   118 	break;

   119       case LPX_UP:

   120       case LPX_DB:

   121       case LPX_FX:

   122 	if (lo==up)

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

   124 	else

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

   126 	break;

   127       default: ;

   128 	//FIXME error

   129       }

   130     }

   132   }

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

   135   {

   136     if (up==-INF) {

   137       //FIXME error

   138     }

   139     int b=lpx_get_col_type(lp, i);

   140     double lo=lpx_get_col_lb(lp, i);

   141     if (up==INF) {

   142       switch (b) {

   143       case LPX_FR:

   144       case LPX_LO:

   145 	break;

   146       case LPX_UP:

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

   148 	break;

   149       case LPX_DB:

   150       case LPX_FX:

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

   152 	break;

   153       default: ;

   154 	//FIXME error

   155       }

   156     } else {

   157       switch (b) {

   158       case LPX_FR:

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

   160 	break;

   161       case LPX_UP:

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

   163 	break;

   164       case LPX_LO:

   165       case LPX_DB:

   166       case LPX_FX:

   167 	if (lo==up)

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

   169 	else

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

   171 	break;

   172       default: ;

   173 	//FIXME error

   174       }

   175     }

   176   }

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

   179   {

   180     if (lo==INF) {

   181       //FIXME error

   182     }

   183     int b=lpx_get_row_type(lp, i);

   184     double up=lpx_get_row_ub(lp, i);

   185     if (lo==-INF) {

   186       switch (b) {

   187       case LPX_FR:

   188       case LPX_LO:

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

   190 	break;

   191       case LPX_UP:

   192 	break;

   193       case LPX_DB:

   194       case LPX_FX:

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

   196 	break;

   197       default: ;

   198 	//FIXME error

   199       }

   200     } else {

   201       switch (b) {

   202       case LPX_FR:

   203       case LPX_LO:

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

   205 	break;

   206       case LPX_UP:

   207       case LPX_DB:

   208       case LPX_FX:

   209 	if (lo==up)

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

   211 	else

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

   213 	break;

   214       default: ;

   215 	//FIXME error

   216       }

   217     }

   218   }

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

   221   {

   222     if (up==-INF) {

   223       //FIXME error

   224     }

   225     int b=lpx_get_row_type(lp, i);

   226     double lo=lpx_get_row_lb(lp, i);

   227     if (up==INF) {

   228       switch (b) {

   229       case LPX_FR:

   230       case LPX_LO:

   231 	break;

   232       case LPX_UP:

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

   234 	break;

   235       case LPX_DB:

   236       case LPX_FX:

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

   238 	break;

   239       default: ;

   240 	//FIXME error

   241       }

   242     } else {

   243       switch (b) {

   244       case LPX_FR:

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

   246 	break;

   247       case LPX_UP:

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

   249 	break;

   250       case LPX_LO:

   251       case LPX_DB:

   252       case LPX_FX:

   253 	if (lo==up)

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

   255 	else

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

   257 	break;

   258       default: ;

   259 	//FIXME error

   260       }

   261     }

   262   }

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

   265   {

   266     //i=0 means the constant term (shift)

   267     lpx_set_obj_coef(lp, i, obj_coef);

   268   }

   270   void LpGlpk::_setObj(int length,

   271 		       int  const * indices,

   272 		       Value  const * values )

   273   {

   274     Value new_values[1+lpx_num_cols()];

   275     for (i=0;i<=lpx_num_cols();++i){

   276       new_values[i]=0;

   277     }

   278     for (i=1;i<=length;++i){

   279       new_values[indices[i]]=values[i];

   280     }

   282     for (i=0;i<=lpx_num_cols();++i){

   283       lpx_set_obj_coef(lp, i, new_values[i]);

   284     }

   285   }

   287   LpGlpk::SolveExitStatus LpGlpk::_solve()

   288   {

   289     int i=  lpx_simplex(lp);

   290     switch (i) {

   291     case LPX_E_OK:

   292       return SOLVED;

   293       break;

   294     default:

   295       return UNSOLVED;

   296     }

   297   }

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

   300   {

   301     return lpx_get_col_prim(lp,i);

   302   }

   304   LpGlpk::Value LpGlpk::_getPrimalValue()

   305   {

   306     return lpx_get_obj_val(lp);

   307   }

   310   LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus()

   311   {

   312     int stat=  lpx_get_status(lp);

   313     switch (stat) {

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

   315       return UNDEFINED;

   316       break;

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

   318     case LPX_INFEAS://Infeasible

   319       return INFEASIBLE;

   320       break;

   321     case LPX_UNBND://Unbounded

   322       return INFINITE;

   323       break;

   324     case LPX_FEAS://Feasible

   325       return FEASIBLE;

   326       break;

   327     case LPX_OPT://Feasible

   328       return OPTIMAL;

   329       break;

   330     default:

   331       return UNDEFINED; //to avoid gcc warning

   332       //FIXME error

   333     }

   334   }

   337   void LpGlpk::_setMax()

   338   {

   339     lpx_set_obj_dir(lp, LPX_MAX);

   340   }

   342   void LpGlpk::_setMin()

   343   {

   344     lpx_set_obj_dir(lp, LPX_MIN);

   345   }

   348   void LpGlpk::messageLevel(int m)

   349   {

   350     lpx_set_int_parm(lp, LPX_K_MSGLEV, m);

   351   }

   353   void LpGlpk::presolver(bool b)

   354   {

   355     lpx_set_int_parm(lp, LPX_K_PRESOL, b);

   356   }

   359 } //END OF NAMESPACE LEMON

   361 #endif //LEMON_LP_GLPK_CC

author	athos
	Wed, 20 Apr 2005 14:29:23 +0000
changeset 1376	8de0c1aeeb32
parent 1368	f9d0d792c8a6
child 1377	bfbb5b30c5b8
permissions	-rw-r--r--