lemon-0.x: lemon/mip_glpk.cc@eaf16c8f6fef

     1 /* -*- C++ -*-

     2  *

     3  * This file is a part of LEMON, a generic C++ optimization library

     4  *

     5  * Copyright (C) 2003-2006

     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).

     8  *

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

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

    11  * precise terms see the accompanying LICENSE file.

    12  *

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

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

    15  * purpose.

    16  *

    17  */

    19 #ifndef LEMON_ILP_GLPK_CC

    20 #define LEMON_ILP_GLPK_CC

    22 ///\file

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

    25 #include <lemon/mip_glpk.h>

    27 namespace lemon {

    29   MipGlpk::MipGlpk() {

    30     lpx_set_class(lp,LPX_MIP);

    31   }

    33   void MipGlpk::_colType(int i, MipGlpk::ColTypes col_type){

    34     switch (col_type){

    35       case INTEGER:

    36 	lpx_set_col_kind(lp,i,LPX_IV);

    37 	break;

    38       case REAL:

    39 	lpx_set_col_kind(lp,i,LPX_CV);

    40 	break;

    41     default:;

    42         //FIXME problem

    43     }

    44   }

    46   MipGlpk::ColTypes MipGlpk::_colType(int i){

    47     switch (lpx_get_col_kind(lp,i)){

    48     case LPX_IV:

    49       return INTEGER;//Or binary

    50     case LPX_CV:

    51       return REAL;

    52     default:

    53       return REAL;//Error!

    54     }

    56   }

    58   LpGlpk::SolveExitStatus MipGlpk::_solve(){

    59     int result = lpx_simplex(lp);

    60     result = lpx_integer(lp);

    61     switch (result){

    62       case LPX_E_OBJLL:

    63       case LPX_E_OBJUL:

    64       case LPX_E_ITLIM:

    65       case LPX_E_TMLIM:

    66       case LPX_E_OK:

    67         return SOLVED;

    68       default:

    69         return UNSOLVED;

    70     }

    71   }

    74   LpGlpk::SolutionStatus MipGlpk::_getMipStatus(){

    76     //Meg kell nezni: ha az LP is infinite, akkor ez is, ha az is

    77     //infeasible, akkor ez is, de ez lehet maskepp is infeasible.

    78     int stat=  lpx_mip_status(lp);

    79     switch (stat) {

    80     case LPX_I_UNDEF://Undefined (no solve has been run yet)

    81       return UNDEFINED;

    82    case LPX_I_NOFEAS://There is no feasible integral solution (primal, I guess)

    83       return INFEASIBLE;

    84 //     case LPX_UNBND://Unbounded

    85 //       return INFINITE;

    86     case LPX_I_FEAS://Feasible

    87       return FEASIBLE;

    88     case LPX_I_OPT://Feasible

    89       return OPTIMAL;

    90     default:

    91       return UNDEFINED; //to avoid gcc warning

    92       //FIXME error

    93     }

    94   }

    96   MipGlpk::Value MipGlpk::_getPrimal(int i){

    97     return lpx_mip_col_val(lp,i);

    98   }

   100   MipGlpk::Value MipGlpk::_getPrimalValue(){

   101     return lpx_mip_obj_val(lp);

   102   }

   103 } //END OG NAMESPACE LEMON

   105 #endif

author	alpar
	Mon, 04 Sep 2006 19:12:44 +0000
changeset 2194	eaf16c8f6fef
parent 2149	b437bdee6fd0
child 2213	2c094dfa176d
permissions	-rw-r--r--