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src/lemon/lp_glpk.cc
author athos
Thu, 07 Apr 2005 15:22:03 +0000
changeset 1319 6e277ba3fc76
parent 1312 48f9299b390d
child 1321 bc3a4c498eb2
permissions -rw-r--r--
Cplex interface has improved a lot. 
     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     /// \e

    28     int LpGlpk::_addCol() { 

    29 	int i=lpx_add_cols(lp, 1);

    30 	_setColLowerBound(i, -INF);

    31 	_setColUpperBound(i, INF);

    32 	return i;

    33     }

    34 

    35     /// \e

    36     int LpGlpk::_addRow() { 

    37 	int i=lpx_add_rows(lp, 1);

    38 	return i;

    39     }

    40 

    41   

    42     void LpGlpk::_setRowCoeffs(int i, 

    43 			       int length,

    44 			       const int   * indices, 

    45 			       const Value   * values )

    46     {

    47       lpx_set_mat_row(lp, i, length,

    48 		      const_cast<int * >(indices) ,

    49 		      const_cast<Value * >(values));

    50     }

    51   

    52     void LpGlpk::_setColCoeffs(int i, 

    53 			       int length,

    54 			       const int   * indices, 

    55 			       const Value   * values)

    56     {

    57       lpx_set_mat_col(lp, i, length,

    58 		      const_cast<int * >(indices),

    59 		      const_cast<Value * >(values));

    60     }

    61   

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

    63     {

    64       if (lo==INF) {

    65 	//FIXME error

    66       }

    67       int b=lpx_get_col_type(lp, i);

    68       double up=lpx_get_col_ub(lp, i);	

    69       if (lo==-INF) {

    70 	switch (b) {

    71 	case LPX_FR:

    72 	case LPX_LO:

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

    74 	  break;

    75 	case LPX_UP:

    76 	  break;

    77 	case LPX_DB:

    78 	case LPX_FX:

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

    80 	  break;

    81 	default: ;

    82 	  //FIXME error

    83 	}

    84       } else {

    85 	switch (b) {

    86 	case LPX_FR:

    87 	case LPX_LO:

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

    89 	  break;

    90 	case LPX_UP:	  

    91 	case LPX_DB:

    92 	case LPX_FX:

    93 	  if (lo==up) 

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

    95 	  else 

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

    97 	  break;

    98 	default: ;

    99 	  //FIXME error

   100 	}

   101       }

   102 

   103     }

   104   

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

   106     {

   107       if (up==-INF) {

   108 	//FIXME error

   109       }

   110       int b=lpx_get_col_type(lp, i);

   111       double lo=lpx_get_col_lb(lp, i);

   112       if (up==INF) {

   113 	switch (b) {

   114 	case LPX_FR:

   115 	case LPX_LO:

   116 	  break;

   117 	case LPX_UP:

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

   119 	  break;

   120 	case LPX_DB:

   121 	case LPX_FX:

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

   123 	  break;

   124 	default: ;

   125 	  //FIXME error

   126 	}

   127       } else {

   128 	switch (b) {

   129 	case LPX_FR:

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

   131 	  break;

   132 	case LPX_UP:

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

   134 	  break;

   135 	case LPX_LO:

   136 	case LPX_DB:

   137 	case LPX_FX:

   138 	  if (lo==up) 

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

   140 	  else 

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

   142 	  break;

   143 	default: ;

   144 	  //FIXME error

   145 	}

   146       }

   147     }

   148   

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

   150     {

   151       if (lo==INF) {

   152 	//FIXME error

   153       }

   154       int b=lpx_get_row_type(lp, i);

   155       double up=lpx_get_row_ub(lp, i);	

   156       if (lo==-INF) {

   157 	switch (b) {

   158 	case LPX_FR:

   159 	case LPX_LO:

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

   161 	  break;

   162 	case LPX_UP:

   163 	  break;

   164 	case LPX_DB:

   165 	case LPX_FX:

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

   167 	  break;

   168 	default: ;

   169 	  //FIXME error

   170 	}

   171       } else {

   172 	switch (b) {

   173 	case LPX_FR:

   174 	case LPX_LO:

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

   176 	  break;

   177 	case LPX_UP:	  

   178 	case LPX_DB:

   179 	case LPX_FX:

   180 	  if (lo==up) 

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

   182 	  else 

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

   184 	  break;

   185 	default: ;

   186 	  //FIXME error

   187 	}

   188       }

   189     }

   190   

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

   192   {

   193     if (up==-INF) {

   194       //FIXME error

   195     }

   196     int b=lpx_get_row_type(lp, i);

   197     double lo=lpx_get_row_lb(lp, i);

   198     if (up==INF) {

   199       switch (b) {

   200       case LPX_FR:

   201       case LPX_LO:

   202 	break;

   203       case LPX_UP:

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

   205 	break;

   206       case LPX_DB:

   207       case LPX_FX:

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

   209 	break;

   210       default: ;

   211 	//FIXME error

   212       }

   213     } else {

   214       switch (b) {

   215       case LPX_FR:

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

   217 	break;

   218       case LPX_UP:

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

   220 	break;

   221       case LPX_LO:

   222       case LPX_DB:

   223       case LPX_FX:

   224 	if (lo==up) 

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

   226 	else 

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

   228 	break;

   229       default: ;

   230 	//FIXME error

   231       }

   232     }

   233   }

   234   

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

   236   {

   237     lpx_set_obj_coef(lp, i, obj_coef);

   238   }

   239 

   240 

   241   LpGlpk::SolveExitStatus LpGlpk::_solve()

   242   {

   243     int i=  lpx_simplex(lp);

   244     switch (i) {

   245     case LPX_E_OK: 

   246       return SOLVED;

   247       break;

   248     default:

   249       return UNSOLVED;

   250     }

   251   }

   252 

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

   254   {

   255     return lpx_get_col_prim(lp,i);

   256   }

   257   

   258   LpGlpk::Value LpGlpk::_getPrimalValue()

   259   {

   260     return lpx_get_obj_val(lp);

   261   }

   262   

   263  

   264   LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus()

   265   {

   266     int stat=  lpx_get_status(lp);

   267     switch (stat) {

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

   269       return UNDEFINED;

   270       break;

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

   272     case LPX_INFEAS://Infeasible 

   273       return INFEASIBLE;

   274       break;

   275     case LPX_UNBND://Unbounded

   276       return INFINITE;

   277       break;

   278     case LPX_FEAS://Feasible

   279       return FEASIBLE;

   280       break;

   281     case LPX_OPT://Feasible

   282       return OPTIMAL;

   283       break;

   284     default:

   285       return UNDEFINED; //to avoid gcc warning

   286       //FIXME error

   287     }

   288   }

   289 

   290 

   291   void LpGlpk::_setMax()

   292   {

   293       lpx_set_obj_dir(lp, LPX_MAX);

   294    }

   295   void LpGlpk::_setMin()

   296   {

   297       lpx_set_obj_dir(lp, LPX_MIN);

   298    }

   299 

   300  

   301 } //END OF NAMESPACE LEMON

   302 

   303 #endif //LEMON_LP_GLPK_CC
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