lemon/lp_glpk.cc
author deba
Wed, 18 Apr 2007 16:35:04 +0000
changeset 2421 160ebfb944a9
parent 2386 81b47fc5c444
child 2441 d8d6ab871608
permissions -rw-r--r--
Small changes
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/* -*- C++ -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library
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 *
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 * Copyright (C) 2003-2007
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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///\file
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///\brief Implementation of the LEMON-GLPK lp solver interface.
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#include <lemon/lp_glpk.h>
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//#include <iostream>
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namespace lemon {
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  LpGlpk::LpGlpk() : Parent() {
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    rows = _lp_bits::LpId(1);
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    cols = _lp_bits::LpId(1);
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    lp = lpx_create_prob();
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    lpx_create_index(lp);
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    ///\todo control function for this:
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    lpx_set_int_parm(lp, LPX_K_DUAL, 1);
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    messageLevel(0);
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  }
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  LpGlpk::LpGlpk(const LpGlpk &glp) : Parent() {
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    rows = _lp_bits::LpId(1);
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    cols = _lp_bits::LpId(1);
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    lp = lpx_create_prob();
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    lpx_create_index(lp);
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    ///\todo control function for this:
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    lpx_set_int_parm(lp, LPX_K_DUAL, 1);
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    messageLevel(0);
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    //Coefficient matrix, row bounds
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    lpx_add_rows(lp, lpx_get_num_rows(glp.lp));
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    lpx_add_cols(lp, lpx_get_num_cols(glp.lp));
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    int len;
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    int ind[1+lpx_get_num_cols(glp.lp)];
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    Value val[1+lpx_get_num_cols(glp.lp)];
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    for (int i=1;i<=lpx_get_num_rows(glp.lp);++i)
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      {
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	len=lpx_get_mat_row(glp.lp,i,ind,val);
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	lpx_set_mat_row(lp, i,len,ind,val);
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	lpx_set_row_bnds(lp,i,lpx_get_row_type(glp.lp,i),
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			 lpx_get_row_lb(glp.lp,i),lpx_get_row_ub(glp.lp,i));
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      }
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    //Objective function, coloumn bounds
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    lpx_set_obj_dir(lp, lpx_get_obj_dir(glp.lp));
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    //Objectif function's constant term treated separately
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    lpx_set_obj_coef(lp,0,lpx_get_obj_coef(glp.lp,0));
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    for (int i=1;i<=lpx_get_num_cols(glp.lp);++i)
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      {
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	lpx_set_obj_coef(lp,i,lpx_get_obj_coef(glp.lp,i));
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	lpx_set_col_bnds(lp,i,lpx_get_col_type(glp.lp,i),
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			 lpx_get_col_lb(glp.lp,i),lpx_get_col_ub(glp.lp,i));
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      }
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  }
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  LpGlpk::~LpGlpk() {
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    lpx_delete_prob(lp);
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  }
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  int LpGlpk::_addCol() { 
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    int i=lpx_add_cols(lp, 1);
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    _setColLowerBound(i, -INF);
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    _setColUpperBound(i, INF);
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    return i;
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  }
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  ///\e
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  LpSolverBase &LpGlpk::_newLp()
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  {
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    LpGlpk* newlp=new LpGlpk;
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    return *newlp;
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  }
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  ///\e
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  LpSolverBase &LpGlpk::_copyLp()
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  {
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    LpGlpk* newlp=new LpGlpk(*this);
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    return *newlp;
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  }
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  int LpGlpk::_addRow() { 
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    int i=lpx_add_rows(lp, 1);
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    return i;
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  }
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  void LpGlpk::_eraseCol(int i) {
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    int ca[2];
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    ca[1]=i;
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    lpx_del_cols(lp, 1, ca);
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  }
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  void LpGlpk::_eraseRow(int i) {
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    int ra[2];
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    ra[1]=i;
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    lpx_del_rows(lp, 1, ra);
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  }
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  void LpGlpk::_getColName(int c, std::string & name) const
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  {
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    char *n = lpx_get_col_name(lp,c);
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    name = n?n:"";
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  }
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  void LpGlpk::_setColName(int c, const std::string & name)
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  {
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    lpx_set_col_name(lp,c,const_cast<char*>(name.c_str()));
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  }
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  int LpGlpk::_colByName(const std::string& name) const
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  {
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    int k = lpx_find_col(lp, const_cast<char*>(name.c_str()));
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    return k > 0 ? k : -1; 
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  }
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  void LpGlpk::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e) 
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  {
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    std::vector<int> indices;
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    std::vector<Value> values;
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    indices.push_back(0);
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    values.push_back(0);
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    for(ConstRowIterator it=b; it!=e; ++it) {
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      indices.push_back(it->first);
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      values.push_back(it->second);
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    }
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    lpx_set_mat_row(lp, i, values.size() - 1, &indices[0], &values[0]);
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  }
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  void LpGlpk::_getRowCoeffs(int ix, RowIterator b) const
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  {
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    int length = lpx_get_mat_row(lp, ix, 0, 0);
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    std::vector<int> indices(length + 1);
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    std::vector<Value> values(length + 1);
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    lpx_get_mat_row(lp, ix, &indices[0], &values[0]);
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    for (int i = 1; i <= length; ++i) {
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      *b = std::make_pair(indices[i], values[i]);
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      ++b;
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    }
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  }
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  void LpGlpk::_setColCoeffs(int ix, ConstColIterator b, ConstColIterator e) {
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    std::vector<int> indices;
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    std::vector<Value> values;
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    indices.push_back(0);
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    values.push_back(0);
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    for(ConstColIterator it=b; it!=e; ++it) {
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      indices.push_back(it->first);
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      values.push_back(it->second);
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    }
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    lpx_set_mat_col(lp, ix, values.size() - 1, &indices[0], &values[0]);
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  }
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  void LpGlpk::_getColCoeffs(int ix, ColIterator b) const
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  {
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    int length = lpx_get_mat_col(lp, ix, 0, 0);
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    std::vector<int> indices(length + 1);
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    std::vector<Value> values(length + 1);
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    lpx_get_mat_col(lp, ix, &indices[0], &values[0]);
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    for (int i = 1; i <= length; ++i) {
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      *b = std::make_pair(indices[i], values[i]);
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      ++b;
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    }
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  }
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  void LpGlpk::_setCoeff(int ix, int jx, Value value) 
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  {
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    if (lpx_get_num_cols(lp) < lpx_get_num_rows(lp)) {
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      int length=lpx_get_mat_row(lp, ix, 0, 0);
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      std::vector<int> indices(length + 2);
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      std::vector<Value> values(length + 2);
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      lpx_get_mat_row(lp, ix, &indices[0], &values[0]);
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      //The following code does not suppose that the elements of the
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      //array indices are sorted
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      bool found=false;
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      for (int i = 1; i <= length; ++i) {
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        if (indices[i]==jx){
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          found=true;
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          values[i]=value;
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          break;
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        }
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      }
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      if (!found){
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        ++length;
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        indices[length]=jx;
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        values[length]=value;
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      }
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      lpx_set_mat_row(lp, ix, length, &indices[0], &values[0]);
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    } else {
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      int length=lpx_get_mat_col(lp, jx, 0, 0);
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      std::vector<int> indices(length + 2);
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      std::vector<Value> values(length + 2);
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      lpx_get_mat_col(lp, jx, &indices[0], &values[0]);
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      //The following code does not suppose that the elements of the
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      //array indices are sorted
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      bool found=false;
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      for (int i = 1; i <= length; ++i) {
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        if (indices[i]==jx){
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          found=true;
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          values[i]=value;
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          break;
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        }
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      }
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      if (!found){
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        ++length;
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        indices[length]=ix;
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        values[length]=value;
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      }
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      lpx_set_mat_col(lp, jx, length, &indices[0], &values[0]);
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    }
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  }
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  LpGlpk::Value LpGlpk::_getCoeff(int ix, int jx) const
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  {
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    int length=lpx_get_mat_row(lp, ix, 0, 0);
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    std::vector<int> indices(length + 1);
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    std::vector<Value> values(length + 1);
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    lpx_get_mat_row(lp, ix, &indices[0], &values[0]);
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    //The following code does not suppose that the elements of the
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    //array indices are sorted
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    for (int i = 1; i <= length; ++i) {
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      if (indices[i]==jx){
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	return values[i];
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      }
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    }
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    return 0;
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  }
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  void LpGlpk::_setColLowerBound(int i, Value lo)
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  {
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    if (lo==INF) {
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      //FIXME error
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    }
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    int b=lpx_get_col_type(lp, i);
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    double up=lpx_get_col_ub(lp, i);	
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    if (lo==-INF) {
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      switch (b) {
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      case LPX_FR:
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      case LPX_LO:
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	lpx_set_col_bnds(lp, i, LPX_FR, lo, up);
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	break;
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      case LPX_UP:
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	break;
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      case LPX_DB:
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      case LPX_FX:
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	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);
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	break;
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   300
      default: ;
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	//FIXME error
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   302
      }
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   303
    } else {
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   304
      switch (b) {
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   305
      case LPX_FR:
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   306
      case LPX_LO:
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   307
	lpx_set_col_bnds(lp, i, LPX_LO, lo, up);
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	break;
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   309
      case LPX_UP:	  
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   310
      case LPX_DB:
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   311
      case LPX_FX:
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   312
	if (lo==up) 
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	  lpx_set_col_bnds(lp, i, LPX_FX, lo, up);
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   314
	else 
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	  lpx_set_col_bnds(lp, i, LPX_DB, lo, up);
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	break;
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   317
      default: ;
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	//FIXME error
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   319
      }
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   320
    }
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   321
alpar@1321
   322
  }
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   323
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   324
  LpGlpk::Value LpGlpk::_getColLowerBound(int i) const
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   325
  {
athos@2328
   326
    int b=lpx_get_col_type(lp, i);
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   327
      switch (b) {
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   328
      case LPX_LO:
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   329
      case LPX_DB:
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   330
      case LPX_FX:
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   331
	return lpx_get_col_lb(lp, i);	
athos@2328
   332
      default: ;
athos@2328
   333
	return -INF;
athos@2328
   334
      }
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   335
  }
alpar@1321
   336
  
alpar@1321
   337
  void LpGlpk::_setColUpperBound(int i, Value up)
alpar@1321
   338
  {
alpar@1321
   339
    if (up==-INF) {
alpar@1321
   340
      //FIXME error
athos@1261
   341
    }
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   342
    int b=lpx_get_col_type(lp, i);
alpar@1321
   343
    double lo=lpx_get_col_lb(lp, i);
alpar@1321
   344
    if (up==INF) {
alpar@1321
   345
      switch (b) {
alpar@1321
   346
      case LPX_FR:
alpar@1321
   347
      case LPX_LO:
alpar@1321
   348
	break;
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   349
      case LPX_UP:
alpar@1321
   350
	lpx_set_col_bnds(lp, i, LPX_FR, lo, up);
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   351
	break;
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   352
      case LPX_DB:
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   353
      case LPX_FX:
alpar@1321
   354
	lpx_set_col_bnds(lp, i, LPX_LO, lo, up);
alpar@1321
   355
	break;
alpar@1321
   356
      default: ;
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   357
	//FIXME error
athos@1261
   358
      }
alpar@1321
   359
    } else {
alpar@1321
   360
      switch (b) {
alpar@1321
   361
      case LPX_FR:
alpar@1321
   362
	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);
alpar@1321
   363
	break;
alpar@1321
   364
      case LPX_UP:
alpar@1321
   365
	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);
alpar@1321
   366
	break;
alpar@1321
   367
      case LPX_LO:
alpar@1321
   368
      case LPX_DB:
alpar@1321
   369
      case LPX_FX:
alpar@1321
   370
	if (lo==up) 
alpar@1321
   371
	  lpx_set_col_bnds(lp, i, LPX_FX, lo, up);
alpar@1321
   372
	else 
alpar@1321
   373
	  lpx_set_col_bnds(lp, i, LPX_DB, lo, up);
alpar@1321
   374
	break;
alpar@1321
   375
      default: ;
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	//FIXME error
athos@1261
   377
      }
alpar@1321
   378
    }
alpar@1321
   379
  }
athos@2328
   380
deba@2366
   381
  LpGlpk::Value LpGlpk::_getColUpperBound(int i) const
athos@2328
   382
  {
athos@2328
   383
    int b=lpx_get_col_type(lp, i);
athos@2328
   384
      switch (b) {
athos@2328
   385
      case LPX_UP:
athos@2328
   386
      case LPX_DB:
athos@2328
   387
      case LPX_FX:
athos@2328
   388
	return lpx_get_col_ub(lp, i);	
athos@2328
   389
      default: ;
athos@2328
   390
	return INF;
athos@2328
   391
      }
athos@2328
   392
  }
alpar@1321
   393
  
athos@1379
   394
  void LpGlpk::_setRowBounds(int i, Value lb, Value ub)
athos@1379
   395
  {
athos@1379
   396
    //Bad parameter
athos@1379
   397
    if (lb==INF || ub==-INF) {
athos@1379
   398
      //FIXME error
athos@1379
   399
    }
athos@1379
   400
athos@1379
   401
    if (lb == -INF){
athos@1379
   402
      if (ub == INF){
athos@1379
   403
	lpx_set_row_bnds(lp, i, LPX_FR, lb, ub);
athos@1379
   404
      }
athos@1379
   405
      else{
athos@1379
   406
	lpx_set_row_bnds(lp, i, LPX_UP, lb, ub);
athos@1379
   407
      }
athos@1379
   408
    }
athos@1379
   409
    else{
athos@1379
   410
      if (ub==INF){
athos@1379
   411
	lpx_set_row_bnds(lp, i, LPX_LO, lb, ub);
athos@1379
   412
athos@1379
   413
      }
athos@1379
   414
      else{
athos@1379
   415
	if (lb == ub){
athos@1379
   416
	  lpx_set_row_bnds(lp, i, LPX_FX, lb, ub);
athos@1379
   417
	}
athos@1379
   418
	else{
athos@1379
   419
	  lpx_set_row_bnds(lp, i, LPX_DB, lb, ub);
athos@1379
   420
	}
athos@1379
   421
      }
athos@1379
   422
    }
athos@1379
   423
athos@1379
   424
  }
athos@2328
   425
deba@2366
   426
  void LpGlpk::_getRowBounds(int i, Value &lb, Value &ub) const
athos@2328
   427
  {
athos@2328
   428
athos@2328
   429
    int b=lpx_get_row_type(lp, i);
athos@2328
   430
    switch (b) {
athos@2328
   431
    case LPX_FR:
athos@2328
   432
    case LPX_UP:
athos@2328
   433
      lb = -INF;
athos@2328
   434
	break;
athos@2328
   435
    default: 
athos@2328
   436
      lb=lpx_get_row_lb(lp, i);
athos@2328
   437
    }
athos@2328
   438
athos@2328
   439
    switch (b) {
athos@2328
   440
    case LPX_FR:
athos@2328
   441
    case LPX_LO:
athos@2328
   442
      ub = INF;
athos@2328
   443
	break;
athos@2328
   444
    default: 
athos@2328
   445
      ub=lpx_get_row_ub(lp, i);
athos@2328
   446
    }
athos@2328
   447
    
athos@2328
   448
  }
athos@1261
   449
  
athos@1298
   450
  void LpGlpk::_setObjCoeff(int i, Value obj_coef)
athos@1298
   451
  {
athos@1376
   452
    //i=0 means the constant term (shift)
athos@1298
   453
    lpx_set_obj_coef(lp, i, obj_coef);
athos@1298
   454
  }
athos@1261
   455
deba@2366
   456
  LpGlpk::Value LpGlpk::_getObjCoeff(int i) const {
athos@2324
   457
    //i=0 means the constant term (shift)
athos@2324
   458
    return lpx_get_obj_coef(lp, i);
athos@2324
   459
  }
athos@2324
   460
athos@1377
   461
  void LpGlpk::_clearObj()
athos@1376
   462
  {
athos@1377
   463
    for (int i=0;i<=lpx_get_num_cols(lp);++i){
athos@1377
   464
      lpx_set_obj_coef(lp, i, 0);
athos@1376
   465
    }
athos@1376
   466
  }
alpar@1263
   467
alpar@1303
   468
  LpGlpk::SolveExitStatus LpGlpk::_solve()
alpar@1263
   469
  {
athos@2345
   470
    // A way to check the problem to be solved
athos@2345
   471
    //lpx_write_cpxlp(lp,"naittvan.cpx");    
athos@2345
   472
deba@2363
   473
    lpx_std_basis(lp);
athos@1458
   474
    int i =  lpx_simplex(lp);
deba@2363
   475
    
athos@1298
   476
    switch (i) {
athos@1298
   477
    case LPX_E_OK: 
athos@1298
   478
      return SOLVED;
athos@1298
   479
    default:
athos@1298
   480
      return UNSOLVED;
athos@1298
   481
    }
alpar@1263
   482
  }
alpar@1263
   483
deba@2366
   484
  LpGlpk::Value LpGlpk::_getPrimal(int i) const
alpar@1263
   485
  {
athos@1298
   486
    return lpx_get_col_prim(lp,i);
alpar@1263
   487
  }
marci@1787
   488
deba@2366
   489
  LpGlpk::Value LpGlpk::_getDual(int i) const
marci@1787
   490
  {
marci@1787
   491
    return lpx_get_row_dual(lp,i);
marci@1787
   492
  }
alpar@1263
   493
  
deba@2366
   494
  LpGlpk::Value LpGlpk::_getPrimalValue() const
alpar@1312
   495
  {
athos@1314
   496
    return lpx_get_obj_val(lp);
alpar@1312
   497
  }
deba@2366
   498
  bool LpGlpk::_isBasicCol(int i) const
deba@2366
   499
  {
marci@1840
   500
    return (lpx_get_col_stat(lp, i)==LPX_BS);
marci@1840
   501
  }
alpar@1312
   502
  
athos@1298
   503
 
deba@2366
   504
  LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() const
alpar@1294
   505
  {
athos@1298
   506
    int stat=  lpx_get_status(lp);
athos@1298
   507
    switch (stat) {
athos@1298
   508
    case LPX_UNDEF://Undefined (no solve has been run yet)
athos@1298
   509
      return UNDEFINED;
athos@1458
   510
    case LPX_NOFEAS://There is no feasible solution (primal, I guess)
athos@1458
   511
    case LPX_INFEAS://Infeasible 
athos@1458
   512
      return INFEASIBLE;
athos@1458
   513
    case LPX_UNBND://Unbounded
athos@1458
   514
      return INFINITE;
athos@1458
   515
    case LPX_FEAS://Feasible
athos@1458
   516
      return FEASIBLE;
athos@1458
   517
    case LPX_OPT://Feasible
athos@1458
   518
      return OPTIMAL;
athos@1458
   519
    default:
athos@1458
   520
      return UNDEFINED; //to avoid gcc warning
athos@1458
   521
      //FIXME error
athos@1458
   522
    }
athos@1458
   523
  }
athos@1458
   524
deba@2366
   525
  LpGlpk::SolutionStatus LpGlpk::_getDualStatus() const
athos@1458
   526
  {
alpar@1466
   527
    switch (lpx_get_dual_stat(lp)) {
athos@1458
   528
    case LPX_D_UNDEF://Undefined (no solve has been run yet)
athos@1458
   529
      return UNDEFINED;
athos@1540
   530
    case LPX_D_NOFEAS://There is no dual feasible solution 
athos@1460
   531
//    case LPX_D_INFEAS://Infeasible 
athos@1458
   532
      return INFEASIBLE;
athos@1473
   533
    case LPX_D_FEAS://Feasible    
athos@1473
   534
      switch (lpx_get_status(lp)) {
athos@1473
   535
      case LPX_NOFEAS:
athos@1458
   536
	return INFINITE;
athos@1458
   537
      case LPX_OPT:
athos@1458
   538
	return OPTIMAL;
athos@1458
   539
      default:
athos@1458
   540
	return FEASIBLE;
athos@1458
   541
      }
athos@1458
   542
    default:
athos@1458
   543
      return UNDEFINED; //to avoid gcc warning
athos@1458
   544
      //FIXME error
athos@1458
   545
    }
athos@1458
   546
  }
athos@1458
   547
deba@2366
   548
  LpGlpk::ProblemTypes LpGlpk::_getProblemType() const
athos@1458
   549
  {
athos@1460
   550
      //int stat=  lpx_get_status(lp);
athos@1458
   551
    int statp=  lpx_get_prim_stat(lp);
athos@1458
   552
    int statd=  lpx_get_dual_stat(lp);
athos@1464
   553
    if (statp==LPX_P_FEAS && statd==LPX_D_FEAS)
athos@1460
   554
	return PRIMAL_DUAL_FEASIBLE;
athos@1464
   555
    if (statp==LPX_P_FEAS && statd==LPX_D_NOFEAS)
athos@1460
   556
	return PRIMAL_FEASIBLE_DUAL_INFEASIBLE;
athos@1464
   557
    if (statp==LPX_P_NOFEAS && statd==LPX_D_FEAS)
athos@1460
   558
	return PRIMAL_INFEASIBLE_DUAL_FEASIBLE;
athos@1464
   559
    if (statp==LPX_P_NOFEAS && statd==LPX_D_NOFEAS)
athos@1460
   560
	return PRIMAL_DUAL_INFEASIBLE;
athos@1460
   561
    //In all other cases
athos@1460
   562
    return UNKNOWN;
alpar@1294
   563
  }
alpar@1263
   564
alpar@1312
   565
  void LpGlpk::_setMax()
alpar@1312
   566
  {
alpar@1321
   567
    lpx_set_obj_dir(lp, LPX_MAX);
alpar@1321
   568
  }
alpar@1321
   569
alpar@1312
   570
  void LpGlpk::_setMin()
alpar@1312
   571
  {
alpar@1321
   572
    lpx_set_obj_dir(lp, LPX_MIN);
alpar@1321
   573
  }
alpar@1321
   574
deba@2366
   575
  bool LpGlpk::_isMax() const
athos@2324
   576
  {
athos@2324
   577
    return (lpx_get_obj_dir(lp)==LPX_MAX);
athos@2324
   578
  }
athos@2324
   579
alpar@1321
   580
 
athos@2324
   581
alpar@1321
   582
  void LpGlpk::messageLevel(int m)
alpar@1321
   583
  {
alpar@1321
   584
    lpx_set_int_parm(lp, LPX_K_MSGLEV, m);
alpar@1321
   585
  }
alpar@1312
   586
alpar@1326
   587
  void LpGlpk::presolver(bool b)
alpar@1326
   588
  {
alpar@1326
   589
    lpx_set_int_parm(lp, LPX_K_PRESOL, b);
alpar@1326
   590
  }
alpar@1326
   591
alpar@1312
   592
 
athos@1261
   593
} //END OF NAMESPACE LEMON