[1261] | 1 | /* -*- C++ -*- |
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| 2 | * |
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[1956] | 3 | * This file is a part of LEMON, a generic C++ optimization library |
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| 4 | * |
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| 5 | * Copyright (C) 2003-2006 |
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| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1359] | 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[1261] | 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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| 19 | ///\file |
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| 20 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
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| 21 | |
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[1305] | 22 | #include <lemon/lp_glpk.h> |
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[1473] | 23 | //#include <iostream> |
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[1261] | 24 | namespace lemon { |
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| 25 | |
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[1364] | 26 | |
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[2363] | 27 | LpGlpk::LpGlpk() : Parent() { |
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| 28 | rows = _lp_bits::LpId(1); |
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| 29 | cols = _lp_bits::LpId(1); |
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| 30 | lp = lpx_create_prob(); |
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| 31 | ///\todo control function for this: |
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[1321] | 32 | lpx_set_int_parm(lp, LPX_K_DUAL, 1); |
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| 33 | messageLevel(0); |
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| 34 | } |
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| 35 | |
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[2363] | 36 | LpGlpk::LpGlpk(const LpGlpk &glp) : Parent() { |
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| 37 | rows = _lp_bits::LpId(1); |
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| 38 | cols = _lp_bits::LpId(1); |
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| 39 | lp = lpx_create_prob(); |
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[2366] | 40 | lpx_create_index(lp); |
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[2363] | 41 | ///\todo control function for this: |
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[2321] | 42 | lpx_set_int_parm(lp, LPX_K_DUAL, 1); |
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| 43 | messageLevel(0); |
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| 44 | //Coefficient matrix, row bounds |
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| 45 | lpx_add_rows(lp, lpx_get_num_rows(glp.lp)); |
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| 46 | lpx_add_cols(lp, lpx_get_num_cols(glp.lp)); |
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| 47 | int len; |
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| 48 | int ind[1+lpx_get_num_cols(glp.lp)]; |
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| 49 | Value val[1+lpx_get_num_cols(glp.lp)]; |
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| 50 | for (int i=1;i<=lpx_get_num_rows(glp.lp);++i) |
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| 51 | { |
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| 52 | len=lpx_get_mat_row(glp.lp,i,ind,val); |
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| 53 | lpx_set_mat_row(lp, i,len,ind,val); |
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| 54 | lpx_set_row_bnds(lp,i,lpx_get_row_type(glp.lp,i), |
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| 55 | lpx_get_row_lb(glp.lp,i),lpx_get_row_ub(glp.lp,i)); |
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| 56 | } |
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| 57 | |
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| 58 | //Objective function, coloumn bounds |
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| 59 | lpx_set_obj_dir(lp, lpx_get_obj_dir(glp.lp)); |
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| 60 | //Objectif function's constant term treated separately |
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| 61 | lpx_set_obj_coef(lp,0,lpx_get_obj_coef(glp.lp,0)); |
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| 62 | for (int i=1;i<=lpx_get_num_cols(glp.lp);++i) |
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| 63 | { |
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| 64 | lpx_set_obj_coef(lp,i,lpx_get_obj_coef(glp.lp,i)); |
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| 65 | lpx_set_col_bnds(lp,i,lpx_get_col_type(glp.lp,i), |
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| 66 | lpx_get_col_lb(glp.lp,i),lpx_get_col_ub(glp.lp,i)); |
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| 67 | } |
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| 68 | } |
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| 69 | |
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[1321] | 70 | LpGlpk::~LpGlpk() { |
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| 71 | lpx_delete_prob(lp); |
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| 72 | } |
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| 73 | |
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| 74 | int LpGlpk::_addCol() { |
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| 75 | int i=lpx_add_cols(lp, 1); |
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| 76 | _setColLowerBound(i, -INF); |
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| 77 | _setColUpperBound(i, INF); |
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| 78 | return i; |
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| 79 | } |
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| 80 | |
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[1436] | 81 | ///\e |
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| 82 | |
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| 83 | |
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| 84 | LpSolverBase &LpGlpk::_newLp() |
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| 85 | { |
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[2321] | 86 | LpGlpk* newlp=new LpGlpk; |
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[1436] | 87 | return *newlp; |
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| 88 | } |
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| 89 | |
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| 90 | ///\e |
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| 91 | |
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| 92 | LpSolverBase &LpGlpk::_copyLp() |
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| 93 | { |
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[2321] | 94 | LpGlpk* newlp=new LpGlpk(*this); |
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[1436] | 95 | return *newlp; |
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| 96 | } |
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| 97 | |
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[1321] | 98 | int LpGlpk::_addRow() { |
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| 99 | int i=lpx_add_rows(lp, 1); |
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| 100 | return i; |
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| 101 | } |
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| 102 | |
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| 103 | |
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[1432] | 104 | void LpGlpk::_eraseCol(int i) { |
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| 105 | int cols[2]; |
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| 106 | cols[1]=i; |
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| 107 | lpx_del_cols(lp, 1, cols); |
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| 108 | } |
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| 109 | |
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| 110 | void LpGlpk::_eraseRow(int i) { |
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| 111 | int rows[2]; |
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| 112 | rows[1]=i; |
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| 113 | lpx_del_rows(lp, 1, rows); |
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| 114 | } |
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| 115 | |
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[2366] | 116 | void LpGlpk::_getColName(int col, std::string & name) const |
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[1895] | 117 | { |
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| 118 | |
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| 119 | char *n = lpx_get_col_name(lp,col); |
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| 120 | name = n?n:""; |
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| 121 | } |
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| 122 | |
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| 123 | |
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| 124 | void LpGlpk::_setColName(int col, const std::string & name) |
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| 125 | { |
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| 126 | lpx_set_col_name(lp,col,const_cast<char*>(name.c_str())); |
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[2349] | 127 | |
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[1895] | 128 | } |
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[2366] | 129 | |
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| 130 | int LpGlpk::_colByName(const std::string& name) const |
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| 131 | { |
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| 132 | int k = lpx_find_col(lp, const_cast<char*>(name.c_str())); |
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| 133 | return k > 0 ? k : -1; |
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| 134 | } |
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| 135 | |
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[1895] | 136 | |
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[2364] | 137 | void LpGlpk::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e) |
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[1321] | 138 | { |
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[2312] | 139 | std::vector<int> indices; |
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| 140 | std::vector<Value> values; |
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| 141 | |
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| 142 | indices.push_back(0); |
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| 143 | values.push_back(0); |
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| 144 | |
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[2364] | 145 | for(ConstRowIterator it=b; it!=e; ++it) { |
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[2312] | 146 | indices.push_back(it->first); |
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| 147 | values.push_back(it->second); |
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| 148 | } |
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| 149 | |
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| 150 | lpx_set_mat_row(lp, i, values.size() - 1, &indices[0], &values[0]); |
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[1321] | 151 | } |
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[2364] | 152 | |
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[2366] | 153 | void LpGlpk::_getRowCoeffs(int i, RowIterator b) const |
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[2364] | 154 | { |
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| 155 | int length = lpx_get_mat_row(lp, i, 0, 0); |
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| 156 | |
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| 157 | std::vector<int> indices(length + 1); |
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| 158 | std::vector<Value> values(length + 1); |
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| 159 | |
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| 160 | lpx_get_mat_row(lp, i, &indices[0], &values[0]); |
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| 161 | |
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| 162 | for (int i = 1; i <= length; ++i) { |
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| 163 | *b = std::make_pair(indices[i], values[i]); |
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| 164 | ++b; |
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| 165 | } |
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| 166 | } |
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[1321] | 167 | |
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[2364] | 168 | void LpGlpk::_setColCoeffs(int i, ConstColIterator b, ConstColIterator e) { |
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[2312] | 169 | |
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| 170 | std::vector<int> indices; |
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| 171 | std::vector<Value> values; |
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| 172 | |
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| 173 | indices.push_back(0); |
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| 174 | values.push_back(0); |
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| 175 | |
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[2364] | 176 | for(ConstColIterator it=b; it!=e; ++it) { |
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[2312] | 177 | indices.push_back(it->first); |
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| 178 | values.push_back(it->second); |
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| 179 | } |
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| 180 | |
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| 181 | lpx_set_mat_col(lp, i, values.size() - 1, &indices[0], &values[0]); |
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[1321] | 182 | } |
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[1431] | 183 | |
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[2366] | 184 | void LpGlpk::_getColCoeffs(int i, ColIterator b) const |
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[2364] | 185 | { |
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| 186 | int length = lpx_get_mat_col(lp, i, 0, 0); |
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| 187 | |
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| 188 | std::vector<int> indices(length + 1); |
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| 189 | std::vector<Value> values(length + 1); |
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| 190 | |
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| 191 | lpx_get_mat_col(lp, i, &indices[0], &values[0]); |
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| 192 | |
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| 193 | for (int i = 1; i <= length; ++i) { |
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| 194 | *b = std::make_pair(indices[i], values[i]); |
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| 195 | ++b; |
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| 196 | } |
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| 197 | } |
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[1431] | 198 | |
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| 199 | void LpGlpk::_setCoeff(int row, int col, Value value) |
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| 200 | { |
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[2312] | 201 | |
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| 202 | if (lpx_get_num_cols(lp) < lpx_get_num_rows(lp)) { |
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| 203 | |
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| 204 | int length=lpx_get_mat_row(lp, row, 0, 0); |
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| 205 | |
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| 206 | std::vector<int> indices(length + 2); |
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| 207 | std::vector<Value> values(length + 2); |
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| 208 | |
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| 209 | lpx_get_mat_row(lp, row, &indices[0], &values[0]); |
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| 210 | |
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| 211 | //The following code does not suppose that the elements of the |
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| 212 | //array indices are sorted |
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| 213 | bool found=false; |
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| 214 | for (int i = 1; i <= length; ++i) { |
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| 215 | if (indices[i]==col){ |
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| 216 | found=true; |
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| 217 | values[i]=value; |
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| 218 | break; |
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| 219 | } |
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| 220 | } |
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| 221 | if (!found){ |
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| 222 | ++length; |
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| 223 | indices[length]=col; |
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| 224 | values[length]=value; |
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| 225 | } |
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[1431] | 226 | |
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[2312] | 227 | lpx_set_mat_row(lp, row, length, &indices[0], &values[0]); |
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| 228 | |
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| 229 | } else { |
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| 230 | |
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| 231 | int length=lpx_get_mat_col(lp, col, 0, 0); |
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| 232 | |
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| 233 | std::vector<int> indices(length + 2); |
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| 234 | std::vector<Value> values(length + 2); |
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| 235 | |
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| 236 | lpx_get_mat_col(lp, col, &indices[0], &values[0]); |
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| 237 | |
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| 238 | //The following code does not suppose that the elements of the |
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| 239 | //array indices are sorted |
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| 240 | bool found=false; |
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| 241 | for (int i = 1; i <= length; ++i) { |
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| 242 | if (indices[i]==col){ |
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| 243 | found=true; |
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| 244 | values[i]=value; |
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| 245 | break; |
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| 246 | } |
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| 247 | } |
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| 248 | if (!found){ |
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| 249 | ++length; |
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| 250 | indices[length]=row; |
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| 251 | values[length]=value; |
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| 252 | } |
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[1431] | 253 | |
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[2312] | 254 | lpx_set_mat_col(lp, col, length, &indices[0], &values[0]); |
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[1431] | 255 | } |
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| 256 | } |
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| 257 | |
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[2366] | 258 | LpGlpk::Value LpGlpk::_getCoeff(int row, int col) const |
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[2324] | 259 | { |
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[2328] | 260 | |
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| 261 | int length=lpx_get_mat_row(lp, row, 0, 0); |
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| 262 | |
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[2364] | 263 | std::vector<int> indices(length + 1); |
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| 264 | std::vector<Value> values(length + 1); |
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[2328] | 265 | |
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| 266 | lpx_get_mat_row(lp, row, &indices[0], &values[0]); |
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| 267 | |
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| 268 | //The following code does not suppose that the elements of the |
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| 269 | //array indices are sorted |
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| 270 | for (int i = 1; i <= length; ++i) { |
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| 271 | if (indices[i]==col){ |
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| 272 | return values[i]; |
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| 273 | } |
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| 274 | } |
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[2324] | 275 | return 0; |
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[2328] | 276 | |
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[2324] | 277 | } |
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| 278 | |
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| 279 | |
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[1321] | 280 | void LpGlpk::_setColLowerBound(int i, Value lo) |
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| 281 | { |
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| 282 | if (lo==INF) { |
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| 283 | //FIXME error |
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| 284 | } |
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| 285 | int b=lpx_get_col_type(lp, i); |
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| 286 | double up=lpx_get_col_ub(lp, i); |
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| 287 | if (lo==-INF) { |
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| 288 | switch (b) { |
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| 289 | case LPX_FR: |
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| 290 | case LPX_LO: |
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| 291 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
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| 292 | break; |
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| 293 | case LPX_UP: |
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| 294 | break; |
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| 295 | case LPX_DB: |
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| 296 | case LPX_FX: |
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| 297 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
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| 298 | break; |
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| 299 | default: ; |
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| 300 | //FIXME error |
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| 301 | } |
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| 302 | } else { |
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| 303 | switch (b) { |
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| 304 | case LPX_FR: |
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| 305 | case LPX_LO: |
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| 306 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
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| 307 | break; |
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| 308 | case LPX_UP: |
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| 309 | case LPX_DB: |
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| 310 | case LPX_FX: |
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| 311 | if (lo==up) |
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| 312 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
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| 313 | else |
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| 314 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
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| 315 | break; |
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| 316 | default: ; |
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| 317 | //FIXME error |
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| 318 | } |
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[1261] | 319 | } |
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| 320 | |
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[1321] | 321 | } |
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[2328] | 322 | |
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[2366] | 323 | LpGlpk::Value LpGlpk::_getColLowerBound(int i) const |
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[2328] | 324 | { |
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| 325 | int b=lpx_get_col_type(lp, i); |
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| 326 | switch (b) { |
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| 327 | case LPX_LO: |
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| 328 | case LPX_DB: |
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| 329 | case LPX_FX: |
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| 330 | return lpx_get_col_lb(lp, i); |
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| 331 | default: ; |
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| 332 | return -INF; |
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| 333 | } |
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| 334 | } |
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[1321] | 335 | |
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| 336 | void LpGlpk::_setColUpperBound(int i, Value up) |
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| 337 | { |
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| 338 | if (up==-INF) { |
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| 339 | //FIXME error |
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[1261] | 340 | } |
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[1321] | 341 | int b=lpx_get_col_type(lp, i); |
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| 342 | double lo=lpx_get_col_lb(lp, i); |
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| 343 | if (up==INF) { |
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| 344 | switch (b) { |
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| 345 | case LPX_FR: |
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| 346 | case LPX_LO: |
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| 347 | break; |
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| 348 | case LPX_UP: |
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| 349 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
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| 350 | break; |
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| 351 | case LPX_DB: |
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| 352 | case LPX_FX: |
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| 353 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
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| 354 | break; |
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| 355 | default: ; |
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[1261] | 356 | //FIXME error |
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| 357 | } |
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[1321] | 358 | } else { |
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| 359 | switch (b) { |
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| 360 | case LPX_FR: |
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| 361 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
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| 362 | break; |
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| 363 | case LPX_UP: |
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| 364 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
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| 365 | break; |
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| 366 | case LPX_LO: |
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| 367 | case LPX_DB: |
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| 368 | case LPX_FX: |
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| 369 | if (lo==up) |
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| 370 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
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| 371 | else |
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| 372 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
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| 373 | break; |
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| 374 | default: ; |
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[1261] | 375 | //FIXME error |
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| 376 | } |
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[1321] | 377 | } |
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| 378 | } |
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[2328] | 379 | |
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[2366] | 380 | LpGlpk::Value LpGlpk::_getColUpperBound(int i) const |
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[2328] | 381 | { |
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| 382 | int b=lpx_get_col_type(lp, i); |
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| 383 | switch (b) { |
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| 384 | case LPX_UP: |
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| 385 | case LPX_DB: |
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| 386 | case LPX_FX: |
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| 387 | return lpx_get_col_ub(lp, i); |
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| 388 | default: ; |
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| 389 | return INF; |
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| 390 | } |
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| 391 | } |
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[1321] | 392 | |
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[1379] | 393 | void LpGlpk::_setRowBounds(int i, Value lb, Value ub) |
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| 394 | { |
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| 395 | //Bad parameter |
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| 396 | if (lb==INF || ub==-INF) { |
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| 397 | //FIXME error |
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| 398 | } |
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| 399 | |
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| 400 | if (lb == -INF){ |
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| 401 | if (ub == INF){ |
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| 402 | lpx_set_row_bnds(lp, i, LPX_FR, lb, ub); |
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| 403 | } |
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| 404 | else{ |
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| 405 | lpx_set_row_bnds(lp, i, LPX_UP, lb, ub); |
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| 406 | } |
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| 407 | } |
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| 408 | else{ |
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| 409 | if (ub==INF){ |
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| 410 | lpx_set_row_bnds(lp, i, LPX_LO, lb, ub); |
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| 411 | |
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| 412 | } |
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| 413 | else{ |
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| 414 | if (lb == ub){ |
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| 415 | lpx_set_row_bnds(lp, i, LPX_FX, lb, ub); |
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| 416 | } |
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| 417 | else{ |
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| 418 | lpx_set_row_bnds(lp, i, LPX_DB, lb, ub); |
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| 419 | } |
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| 420 | } |
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| 421 | } |
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| 422 | |
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| 423 | } |
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[2328] | 424 | |
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[2366] | 425 | void LpGlpk::_getRowBounds(int i, Value &lb, Value &ub) const |
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[2328] | 426 | { |
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| 427 | |
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| 428 | int b=lpx_get_row_type(lp, i); |
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| 429 | switch (b) { |
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| 430 | case LPX_FR: |
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| 431 | case LPX_UP: |
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| 432 | lb = -INF; |
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| 433 | break; |
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| 434 | default: |
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| 435 | lb=lpx_get_row_lb(lp, i); |
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| 436 | } |
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| 437 | |
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| 438 | switch (b) { |
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| 439 | case LPX_FR: |
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| 440 | case LPX_LO: |
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| 441 | ub = INF; |
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| 442 | break; |
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| 443 | default: |
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| 444 | ub=lpx_get_row_ub(lp, i); |
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| 445 | } |
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| 446 | |
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| 447 | } |
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[1261] | 448 | |
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[1298] | 449 | void LpGlpk::_setObjCoeff(int i, Value obj_coef) |
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| 450 | { |
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[1376] | 451 | //i=0 means the constant term (shift) |
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[1298] | 452 | lpx_set_obj_coef(lp, i, obj_coef); |
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| 453 | } |
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[1261] | 454 | |
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[2366] | 455 | LpGlpk::Value LpGlpk::_getObjCoeff(int i) const { |
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[2324] | 456 | //i=0 means the constant term (shift) |
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| 457 | return lpx_get_obj_coef(lp, i); |
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| 458 | } |
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| 459 | |
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[1377] | 460 | void LpGlpk::_clearObj() |
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[1376] | 461 | { |
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[1377] | 462 | for (int i=0;i<=lpx_get_num_cols(lp);++i){ |
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| 463 | lpx_set_obj_coef(lp, i, 0); |
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[1376] | 464 | } |
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| 465 | } |
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[1263] | 466 | |
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[1303] | 467 | LpGlpk::SolveExitStatus LpGlpk::_solve() |
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[1263] | 468 | { |
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[2345] | 469 | // A way to check the problem to be solved |
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| 470 | //lpx_write_cpxlp(lp,"naittvan.cpx"); |
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| 471 | |
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[2363] | 472 | lpx_std_basis(lp); |
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[1458] | 473 | int i = lpx_simplex(lp); |
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[2363] | 474 | |
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[1298] | 475 | switch (i) { |
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| 476 | case LPX_E_OK: |
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| 477 | return SOLVED; |
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| 478 | default: |
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| 479 | return UNSOLVED; |
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| 480 | } |
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[1263] | 481 | } |
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| 482 | |
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[2366] | 483 | LpGlpk::Value LpGlpk::_getPrimal(int i) const |
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[1263] | 484 | { |
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[1298] | 485 | return lpx_get_col_prim(lp,i); |
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[1263] | 486 | } |
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[1787] | 487 | |
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[2366] | 488 | LpGlpk::Value LpGlpk::_getDual(int i) const |
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[1787] | 489 | { |
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| 490 | return lpx_get_row_dual(lp,i); |
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| 491 | } |
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[1263] | 492 | |
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[2366] | 493 | LpGlpk::Value LpGlpk::_getPrimalValue() const |
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[1312] | 494 | { |
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[1314] | 495 | return lpx_get_obj_val(lp); |
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[1312] | 496 | } |
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[2366] | 497 | bool LpGlpk::_isBasicCol(int i) const |
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| 498 | { |
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[1840] | 499 | return (lpx_get_col_stat(lp, i)==LPX_BS); |
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| 500 | } |
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[1312] | 501 | |
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[1298] | 502 | |
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[2366] | 503 | LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() const |
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[1294] | 504 | { |
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[1298] | 505 | int stat= lpx_get_status(lp); |
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| 506 | switch (stat) { |
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| 507 | case LPX_UNDEF://Undefined (no solve has been run yet) |
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| 508 | return UNDEFINED; |
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[1458] | 509 | case LPX_NOFEAS://There is no feasible solution (primal, I guess) |
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| 510 | case LPX_INFEAS://Infeasible |
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| 511 | return INFEASIBLE; |
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| 512 | case LPX_UNBND://Unbounded |
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| 513 | return INFINITE; |
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| 514 | case LPX_FEAS://Feasible |
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| 515 | return FEASIBLE; |
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| 516 | case LPX_OPT://Feasible |
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| 517 | return OPTIMAL; |
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| 518 | default: |
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| 519 | return UNDEFINED; //to avoid gcc warning |
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| 520 | //FIXME error |
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| 521 | } |
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| 522 | } |
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| 523 | |
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[2366] | 524 | LpGlpk::SolutionStatus LpGlpk::_getDualStatus() const |
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[1458] | 525 | { |
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[1466] | 526 | switch (lpx_get_dual_stat(lp)) { |
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[1458] | 527 | case LPX_D_UNDEF://Undefined (no solve has been run yet) |
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| 528 | return UNDEFINED; |
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[1540] | 529 | case LPX_D_NOFEAS://There is no dual feasible solution |
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[1460] | 530 | // case LPX_D_INFEAS://Infeasible |
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[1458] | 531 | return INFEASIBLE; |
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[1473] | 532 | case LPX_D_FEAS://Feasible |
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| 533 | switch (lpx_get_status(lp)) { |
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| 534 | case LPX_NOFEAS: |
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[1458] | 535 | return INFINITE; |
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| 536 | case LPX_OPT: |
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| 537 | return OPTIMAL; |
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| 538 | default: |
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| 539 | return FEASIBLE; |
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| 540 | } |
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| 541 | default: |
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| 542 | return UNDEFINED; //to avoid gcc warning |
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| 543 | //FIXME error |
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| 544 | } |
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| 545 | } |
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| 546 | |
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[2366] | 547 | LpGlpk::ProblemTypes LpGlpk::_getProblemType() const |
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[1458] | 548 | { |
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[1460] | 549 | //int stat= lpx_get_status(lp); |
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[1458] | 550 | int statp= lpx_get_prim_stat(lp); |
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| 551 | int statd= lpx_get_dual_stat(lp); |
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[1464] | 552 | if (statp==LPX_P_FEAS && statd==LPX_D_FEAS) |
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[1460] | 553 | return PRIMAL_DUAL_FEASIBLE; |
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[1464] | 554 | if (statp==LPX_P_FEAS && statd==LPX_D_NOFEAS) |
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[1460] | 555 | return PRIMAL_FEASIBLE_DUAL_INFEASIBLE; |
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[1464] | 556 | if (statp==LPX_P_NOFEAS && statd==LPX_D_FEAS) |
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[1460] | 557 | return PRIMAL_INFEASIBLE_DUAL_FEASIBLE; |
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[1464] | 558 | if (statp==LPX_P_NOFEAS && statd==LPX_D_NOFEAS) |
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[1460] | 559 | return PRIMAL_DUAL_INFEASIBLE; |
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| 560 | //In all other cases |
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| 561 | return UNKNOWN; |
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[1294] | 562 | } |
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[1263] | 563 | |
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[1312] | 564 | void LpGlpk::_setMax() |
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| 565 | { |
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[1321] | 566 | lpx_set_obj_dir(lp, LPX_MAX); |
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| 567 | } |
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| 568 | |
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[1312] | 569 | void LpGlpk::_setMin() |
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| 570 | { |
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[1321] | 571 | lpx_set_obj_dir(lp, LPX_MIN); |
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| 572 | } |
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| 573 | |
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[2366] | 574 | bool LpGlpk::_isMax() const |
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[2324] | 575 | { |
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| 576 | return (lpx_get_obj_dir(lp)==LPX_MAX); |
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| 577 | } |
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| 578 | |
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[1321] | 579 | |
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[2324] | 580 | |
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[1321] | 581 | void LpGlpk::messageLevel(int m) |
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| 582 | { |
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| 583 | lpx_set_int_parm(lp, LPX_K_MSGLEV, m); |
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| 584 | } |
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[1312] | 585 | |
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[1326] | 586 | void LpGlpk::presolver(bool b) |
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| 587 | { |
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| 588 | lpx_set_int_parm(lp, LPX_K_PRESOL, b); |
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| 589 | } |
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| 590 | |
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[1312] | 591 | |
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[1261] | 592 | } //END OF NAMESPACE LEMON |
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