[1261] | 1 | /* -*- C++ -*- |
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| 2 | * src/lemon/lp_glpk.cc - Part of LEMON, a generic C++ optimization library |
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| 3 | * |
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| 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1359] | 5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[1261] | 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef LEMON_LP_GLPK_CC |
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| 18 | #define LEMON_LP_GLPK_CC |
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| 19 | |
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| 20 | ///\file |
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| 21 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
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| 22 | |
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[1305] | 23 | #include <lemon/lp_glpk.h> |
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[1261] | 24 | |
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| 25 | namespace lemon { |
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| 26 | |
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[1321] | 27 | LpGlpk::LpGlpk() : Parent(), |
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| 28 | lp(lpx_create_prob()) { |
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| 29 | ///\todo constrol function for this: |
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| 30 | lpx_set_int_parm(lp, LPX_K_DUAL, 1); |
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| 31 | messageLevel(0); |
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| 32 | } |
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| 33 | |
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| 34 | LpGlpk::~LpGlpk() { |
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| 35 | lpx_delete_prob(lp); |
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| 36 | } |
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| 37 | |
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| 38 | int LpGlpk::_addCol() { |
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| 39 | int i=lpx_add_cols(lp, 1); |
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| 40 | _setColLowerBound(i, -INF); |
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| 41 | _setColUpperBound(i, INF); |
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| 42 | return i; |
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| 43 | } |
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| 44 | |
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| 45 | int LpGlpk::_addRow() { |
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| 46 | int i=lpx_add_rows(lp, 1); |
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| 47 | return i; |
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| 48 | } |
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| 49 | |
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| 50 | |
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| 51 | void LpGlpk::_setRowCoeffs(int i, |
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| 52 | int length, |
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| 53 | const int * indices, |
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| 54 | const Value * values ) |
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| 55 | { |
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| 56 | lpx_set_mat_row(lp, i, length, |
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| 57 | const_cast<int * >(indices) , |
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| 58 | const_cast<Value * >(values)); |
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| 59 | } |
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| 60 | |
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| 61 | void LpGlpk::_setColCoeffs(int i, |
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| 62 | int length, |
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| 63 | const int * indices, |
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| 64 | const Value * values) |
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| 65 | { |
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| 66 | lpx_set_mat_col(lp, i, length, |
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| 67 | const_cast<int * >(indices), |
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| 68 | const_cast<Value * >(values)); |
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| 69 | } |
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| 70 | |
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| 71 | void LpGlpk::_setColLowerBound(int i, Value lo) |
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| 72 | { |
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| 73 | if (lo==INF) { |
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| 74 | //FIXME error |
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| 75 | } |
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| 76 | int b=lpx_get_col_type(lp, i); |
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| 77 | double up=lpx_get_col_ub(lp, i); |
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| 78 | if (lo==-INF) { |
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| 79 | switch (b) { |
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| 80 | case LPX_FR: |
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| 81 | case LPX_LO: |
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| 82 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
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| 83 | break; |
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| 84 | case LPX_UP: |
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| 85 | break; |
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| 86 | case LPX_DB: |
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| 87 | case LPX_FX: |
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| 88 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
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| 89 | break; |
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| 90 | default: ; |
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| 91 | //FIXME error |
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| 92 | } |
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| 93 | } else { |
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| 94 | switch (b) { |
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| 95 | case LPX_FR: |
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| 96 | case LPX_LO: |
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| 97 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
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| 98 | break; |
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| 99 | case LPX_UP: |
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| 100 | case LPX_DB: |
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| 101 | case LPX_FX: |
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| 102 | if (lo==up) |
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| 103 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
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| 104 | else |
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| 105 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
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| 106 | break; |
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| 107 | default: ; |
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| 108 | //FIXME error |
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| 109 | } |
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[1261] | 110 | } |
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| 111 | |
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[1321] | 112 | } |
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| 113 | |
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| 114 | void LpGlpk::_setColUpperBound(int i, Value up) |
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| 115 | { |
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| 116 | if (up==-INF) { |
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| 117 | //FIXME error |
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[1261] | 118 | } |
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[1321] | 119 | int b=lpx_get_col_type(lp, i); |
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| 120 | double lo=lpx_get_col_lb(lp, i); |
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| 121 | if (up==INF) { |
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| 122 | switch (b) { |
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| 123 | case LPX_FR: |
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| 124 | case LPX_LO: |
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| 125 | break; |
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| 126 | case LPX_UP: |
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| 127 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
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| 128 | break; |
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| 129 | case LPX_DB: |
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| 130 | case LPX_FX: |
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| 131 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
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| 132 | break; |
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| 133 | default: ; |
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[1261] | 134 | //FIXME error |
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| 135 | } |
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[1321] | 136 | } else { |
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| 137 | switch (b) { |
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| 138 | case LPX_FR: |
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| 139 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
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| 140 | break; |
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| 141 | case LPX_UP: |
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| 142 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
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| 143 | break; |
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| 144 | case LPX_LO: |
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| 145 | case LPX_DB: |
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| 146 | case LPX_FX: |
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| 147 | if (lo==up) |
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| 148 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
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| 149 | else |
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| 150 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
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| 151 | break; |
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| 152 | default: ; |
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[1261] | 153 | //FIXME error |
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| 154 | } |
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[1321] | 155 | } |
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| 156 | } |
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| 157 | |
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| 158 | void LpGlpk::_setRowLowerBound(int i, Value lo) |
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| 159 | { |
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| 160 | if (lo==INF) { |
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| 161 | //FIXME error |
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| 162 | } |
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| 163 | int b=lpx_get_row_type(lp, i); |
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| 164 | double up=lpx_get_row_ub(lp, i); |
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| 165 | if (lo==-INF) { |
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| 166 | switch (b) { |
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| 167 | case LPX_FR: |
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| 168 | case LPX_LO: |
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| 169 | lpx_set_row_bnds(lp, i, LPX_FR, lo, up); |
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| 170 | break; |
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| 171 | case LPX_UP: |
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| 172 | break; |
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| 173 | case LPX_DB: |
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| 174 | case LPX_FX: |
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| 175 | lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
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| 176 | break; |
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| 177 | default: ; |
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| 178 | //FIXME error |
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| 179 | } |
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| 180 | } else { |
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| 181 | switch (b) { |
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| 182 | case LPX_FR: |
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| 183 | case LPX_LO: |
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| 184 | lpx_set_row_bnds(lp, i, LPX_LO, lo, up); |
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| 185 | break; |
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| 186 | case LPX_UP: |
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| 187 | case LPX_DB: |
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| 188 | case LPX_FX: |
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| 189 | if (lo==up) |
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| 190 | lpx_set_row_bnds(lp, i, LPX_FX, lo, up); |
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| 191 | else |
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| 192 | lpx_set_row_bnds(lp, i, LPX_DB, lo, up); |
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| 193 | break; |
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| 194 | default: ; |
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| 195 | //FIXME error |
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[1261] | 196 | } |
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| 197 | } |
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[1321] | 198 | } |
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[1261] | 199 | |
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[1298] | 200 | void LpGlpk::_setRowUpperBound(int i, Value up) |
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| 201 | { |
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| 202 | if (up==-INF) { |
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| 203 | //FIXME error |
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| 204 | } |
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| 205 | int b=lpx_get_row_type(lp, i); |
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| 206 | double lo=lpx_get_row_lb(lp, i); |
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| 207 | if (up==INF) { |
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| 208 | switch (b) { |
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| 209 | case LPX_FR: |
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| 210 | case LPX_LO: |
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| 211 | break; |
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| 212 | case LPX_UP: |
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| 213 | lpx_set_row_bnds(lp, i, LPX_FR, lo, up); |
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| 214 | break; |
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| 215 | case LPX_DB: |
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| 216 | case LPX_FX: |
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| 217 | lpx_set_row_bnds(lp, i, LPX_LO, lo, up); |
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| 218 | break; |
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| 219 | default: ; |
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[1261] | 220 | //FIXME error |
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| 221 | } |
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[1298] | 222 | } else { |
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| 223 | switch (b) { |
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| 224 | case LPX_FR: |
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| 225 | lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
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| 226 | break; |
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| 227 | case LPX_UP: |
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| 228 | lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
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| 229 | break; |
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| 230 | case LPX_LO: |
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| 231 | case LPX_DB: |
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| 232 | case LPX_FX: |
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| 233 | if (lo==up) |
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| 234 | lpx_set_row_bnds(lp, i, LPX_FX, lo, up); |
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| 235 | else |
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| 236 | lpx_set_row_bnds(lp, i, LPX_DB, lo, up); |
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| 237 | break; |
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| 238 | default: ; |
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| 239 | //FIXME error |
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[1261] | 240 | } |
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| 241 | } |
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[1298] | 242 | } |
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[1261] | 243 | |
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[1298] | 244 | void LpGlpk::_setObjCoeff(int i, Value obj_coef) |
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| 245 | { |
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| 246 | lpx_set_obj_coef(lp, i, obj_coef); |
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| 247 | } |
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[1261] | 248 | |
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[1263] | 249 | |
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[1303] | 250 | LpGlpk::SolveExitStatus LpGlpk::_solve() |
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[1263] | 251 | { |
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[1298] | 252 | int i= lpx_simplex(lp); |
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| 253 | switch (i) { |
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| 254 | case LPX_E_OK: |
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| 255 | return SOLVED; |
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| 256 | break; |
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| 257 | default: |
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| 258 | return UNSOLVED; |
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| 259 | } |
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[1263] | 260 | } |
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| 261 | |
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[1293] | 262 | LpGlpk::Value LpGlpk::_getPrimal(int i) |
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[1263] | 263 | { |
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[1298] | 264 | return lpx_get_col_prim(lp,i); |
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[1263] | 265 | } |
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| 266 | |
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[1312] | 267 | LpGlpk::Value LpGlpk::_getPrimalValue() |
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| 268 | { |
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[1314] | 269 | return lpx_get_obj_val(lp); |
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[1312] | 270 | } |
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| 271 | |
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[1298] | 272 | |
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[1312] | 273 | LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() |
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[1294] | 274 | { |
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[1298] | 275 | int stat= lpx_get_status(lp); |
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| 276 | switch (stat) { |
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| 277 | case LPX_UNDEF://Undefined (no solve has been run yet) |
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| 278 | return UNDEFINED; |
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| 279 | break; |
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| 280 | case LPX_NOFEAS://There is no feasible solution (primal, I guess) |
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| 281 | case LPX_INFEAS://Infeasible |
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| 282 | return INFEASIBLE; |
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| 283 | break; |
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| 284 | case LPX_UNBND://Unbounded |
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| 285 | return INFINITE; |
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| 286 | break; |
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| 287 | case LPX_FEAS://Feasible |
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[1300] | 288 | return FEASIBLE; |
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[1298] | 289 | break; |
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| 290 | case LPX_OPT://Feasible |
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| 291 | return OPTIMAL; |
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| 292 | break; |
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[1300] | 293 | default: |
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| 294 | return UNDEFINED; //to avoid gcc warning |
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[1298] | 295 | //FIXME error |
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| 296 | } |
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[1294] | 297 | } |
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[1263] | 298 | |
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| 299 | |
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[1312] | 300 | void LpGlpk::_setMax() |
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| 301 | { |
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[1321] | 302 | lpx_set_obj_dir(lp, LPX_MAX); |
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| 303 | } |
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| 304 | |
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[1312] | 305 | void LpGlpk::_setMin() |
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| 306 | { |
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[1321] | 307 | lpx_set_obj_dir(lp, LPX_MIN); |
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| 308 | } |
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| 309 | |
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| 310 | |
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| 311 | void LpGlpk::messageLevel(int m) |
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| 312 | { |
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| 313 | lpx_set_int_parm(lp, LPX_K_MSGLEV, m); |
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| 314 | } |
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[1312] | 315 | |
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[1326] | 316 | void LpGlpk::presolver(bool b) |
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| 317 | { |
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| 318 | lpx_set_int_parm(lp, LPX_K_PRESOL, b); |
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| 319 | } |
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| 320 | |
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[1312] | 321 | |
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[1261] | 322 | } //END OF NAMESPACE LEMON |
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| 323 | |
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| 324 | #endif //LEMON_LP_GLPK_CC |
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