1 | /* $Id: ClpSimplex.hpp 1989 2013-11-11 17:27:32Z stefan $ */ |
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2 | // Copyright (C) 2002, International Business Machines |
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3 | // Corporation and others. All Rights Reserved. |
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4 | // This code is licensed under the terms of the Eclipse Public License (EPL). |
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5 | /* |
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6 | Authors |
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7 | |
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8 | John Forrest |
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9 | |
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10 | */ |
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11 | #ifndef ClpSimplex_H |
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12 | #define ClpSimplex_H |
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13 | |
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14 | #include <iostream> |
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15 | #include <cfloat> |
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16 | #include "ClpModel.hpp" |
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17 | #include "ClpMatrixBase.hpp" |
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18 | #include "ClpSolve.hpp" |
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19 | #include "ClpConfig.h" |
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20 | class ClpDualRowPivot; |
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21 | class ClpPrimalColumnPivot; |
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22 | class ClpFactorization; |
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23 | class CoinIndexedVector; |
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24 | class ClpNonLinearCost; |
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25 | class ClpNodeStuff; |
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26 | class CoinStructuredModel; |
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27 | class OsiClpSolverInterface; |
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28 | class CoinWarmStartBasis; |
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29 | class ClpDisasterHandler; |
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30 | class ClpConstraint; |
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31 | #ifdef CLP_HAS_ABC |
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32 | #include "AbcCommon.hpp" |
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33 | class AbcTolerancesEtc; |
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34 | class AbcSimplex; |
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35 | #include "CoinAbcCommon.hpp" |
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36 | #endif |
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37 | /** This solves LPs using the simplex method |
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38 | |
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39 | It inherits from ClpModel and all its arrays are created at |
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40 | algorithm time. Originally I tried to work with model arrays |
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41 | but for simplicity of coding I changed to single arrays with |
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42 | structural variables then row variables. Some coding is still |
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43 | based on old style and needs cleaning up. |
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44 | |
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45 | For a description of algorithms: |
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46 | |
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47 | for dual see ClpSimplexDual.hpp and at top of ClpSimplexDual.cpp |
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48 | for primal see ClpSimplexPrimal.hpp and at top of ClpSimplexPrimal.cpp |
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49 | |
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50 | There is an algorithm data member. + for primal variations |
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51 | and - for dual variations |
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52 | |
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53 | */ |
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54 | |
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55 | class ClpSimplex : public ClpModel { |
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56 | friend void ClpSimplexUnitTest(const std::string & mpsDir); |
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57 | |
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58 | public: |
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59 | /** enums for status of various sorts. |
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60 | First 4 match CoinWarmStartBasis, |
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61 | isFixed means fixed at lower bound and out of basis |
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62 | */ |
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63 | enum Status { |
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64 | isFree = 0x00, |
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65 | basic = 0x01, |
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66 | atUpperBound = 0x02, |
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67 | atLowerBound = 0x03, |
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68 | superBasic = 0x04, |
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69 | isFixed = 0x05 |
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70 | }; |
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71 | // For Dual |
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72 | enum FakeBound { |
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73 | noFake = 0x00, |
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74 | lowerFake = 0x01, |
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75 | upperFake = 0x02, |
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76 | bothFake = 0x03 |
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77 | }; |
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78 | |
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79 | /**@name Constructors and destructor and copy */ |
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80 | //@{ |
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81 | /// Default constructor |
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82 | ClpSimplex (bool emptyMessages = false ); |
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83 | |
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84 | /** Copy constructor. May scale depending on mode |
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85 | -1 leave mode as is |
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86 | 0 -off, 1 equilibrium, 2 geometric, 3, auto, 4 dynamic(later) |
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87 | */ |
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88 | ClpSimplex(const ClpSimplex & rhs, int scalingMode = -1); |
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89 | /** Copy constructor from model. May scale depending on mode |
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90 | -1 leave mode as is |
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91 | 0 -off, 1 equilibrium, 2 geometric, 3, auto, 4 dynamic(later) |
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92 | */ |
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93 | ClpSimplex(const ClpModel & rhs, int scalingMode = -1); |
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94 | /** Subproblem constructor. A subset of whole model is created from the |
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95 | row and column lists given. The new order is given by list order and |
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96 | duplicates are allowed. Name and integer information can be dropped |
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97 | Can optionally modify rhs to take into account variables NOT in list |
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98 | in this case duplicates are not allowed (also see getbackSolution) |
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99 | */ |
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100 | ClpSimplex (const ClpModel * wholeModel, |
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101 | int numberRows, const int * whichRows, |
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102 | int numberColumns, const int * whichColumns, |
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103 | bool dropNames = true, bool dropIntegers = true, |
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104 | bool fixOthers = false); |
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105 | /** Subproblem constructor. A subset of whole model is created from the |
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106 | row and column lists given. The new order is given by list order and |
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107 | duplicates are allowed. Name and integer information can be dropped |
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108 | Can optionally modify rhs to take into account variables NOT in list |
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109 | in this case duplicates are not allowed (also see getbackSolution) |
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110 | */ |
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111 | ClpSimplex (const ClpSimplex * wholeModel, |
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112 | int numberRows, const int * whichRows, |
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113 | int numberColumns, const int * whichColumns, |
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114 | bool dropNames = true, bool dropIntegers = true, |
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115 | bool fixOthers = false); |
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116 | /** This constructor modifies original ClpSimplex and stores |
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117 | original stuff in created ClpSimplex. It is only to be used in |
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118 | conjunction with originalModel */ |
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119 | ClpSimplex (ClpSimplex * wholeModel, |
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120 | int numberColumns, const int * whichColumns); |
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121 | /** This copies back stuff from miniModel and then deletes miniModel. |
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122 | Only to be used with mini constructor */ |
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123 | void originalModel(ClpSimplex * miniModel); |
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124 | inline int abcState() const |
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125 | { return abcState_;} |
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126 | inline void setAbcState(int state) |
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127 | { abcState_=state;} |
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128 | #ifdef ABC_INHERIT |
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129 | inline AbcSimplex * abcSimplex() const |
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130 | { return abcSimplex_;} |
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131 | inline void setAbcSimplex(AbcSimplex * simplex) |
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132 | { abcSimplex_=simplex;} |
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133 | /// Returns 0 if dual can be skipped |
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134 | int doAbcDual(); |
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135 | /// Returns 0 if primal can be skipped |
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136 | int doAbcPrimal(int ifValuesPass); |
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137 | #endif |
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138 | /** Array persistence flag |
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139 | If 0 then as now (delete/new) |
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140 | 1 then only do arrays if bigger needed |
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141 | 2 as 1 but give a bit extra if bigger needed |
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142 | */ |
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143 | void setPersistenceFlag(int value); |
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144 | /// Save a copy of model with certain state - normally without cuts |
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145 | void makeBaseModel(); |
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146 | /// Switch off base model |
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147 | void deleteBaseModel(); |
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148 | /// See if we have base model |
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149 | inline ClpSimplex * baseModel() const { |
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150 | return baseModel_; |
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151 | } |
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152 | /** Reset to base model (just size and arrays needed) |
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153 | If model NULL use internal copy |
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154 | */ |
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155 | void setToBaseModel(ClpSimplex * model = NULL); |
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156 | /// Assignment operator. This copies the data |
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157 | ClpSimplex & operator=(const ClpSimplex & rhs); |
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158 | /// Destructor |
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159 | ~ClpSimplex ( ); |
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160 | // Ones below are just ClpModel with some changes |
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161 | /** Loads a problem (the constraints on the |
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162 | rows are given by lower and upper bounds). If a pointer is 0 then the |
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163 | following values are the default: |
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164 | <ul> |
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165 | <li> <code>colub</code>: all columns have upper bound infinity |
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166 | <li> <code>collb</code>: all columns have lower bound 0 |
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167 | <li> <code>rowub</code>: all rows have upper bound infinity |
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168 | <li> <code>rowlb</code>: all rows have lower bound -infinity |
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169 | <li> <code>obj</code>: all variables have 0 objective coefficient |
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170 | </ul> |
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171 | */ |
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172 | void loadProblem ( const ClpMatrixBase& matrix, |
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173 | const double* collb, const double* colub, |
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174 | const double* obj, |
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175 | const double* rowlb, const double* rowub, |
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176 | const double * rowObjective = NULL); |
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177 | void loadProblem ( const CoinPackedMatrix& matrix, |
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178 | const double* collb, const double* colub, |
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179 | const double* obj, |
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180 | const double* rowlb, const double* rowub, |
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181 | const double * rowObjective = NULL); |
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182 | |
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183 | /** Just like the other loadProblem() method except that the matrix is |
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184 | given in a standard column major ordered format (without gaps). */ |
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185 | void loadProblem ( const int numcols, const int numrows, |
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186 | const CoinBigIndex* start, const int* index, |
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187 | const double* value, |
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188 | const double* collb, const double* colub, |
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189 | const double* obj, |
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190 | const double* rowlb, const double* rowub, |
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191 | const double * rowObjective = NULL); |
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192 | /// This one is for after presolve to save memory |
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193 | void loadProblem ( const int numcols, const int numrows, |
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194 | const CoinBigIndex* start, const int* index, |
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195 | const double* value, const int * length, |
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196 | const double* collb, const double* colub, |
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197 | const double* obj, |
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198 | const double* rowlb, const double* rowub, |
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199 | const double * rowObjective = NULL); |
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200 | /** This loads a model from a coinModel object - returns number of errors. |
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201 | If keepSolution true and size is same as current then |
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202 | keeps current status and solution |
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203 | */ |
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204 | int loadProblem ( CoinModel & modelObject, bool keepSolution = false); |
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205 | /// Read an mps file from the given filename |
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206 | int readMps(const char *filename, |
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207 | bool keepNames = false, |
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208 | bool ignoreErrors = false); |
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209 | /// Read GMPL files from the given filenames |
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210 | int readGMPL(const char *filename, const char * dataName, |
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211 | bool keepNames = false); |
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212 | /// Read file in LP format from file with name filename. |
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213 | /// See class CoinLpIO for description of this format. |
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214 | int readLp(const char *filename, const double epsilon = 1e-5); |
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215 | /** Borrow model. This is so we dont have to copy large amounts |
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216 | of data around. It assumes a derived class wants to overwrite |
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217 | an empty model with a real one - while it does an algorithm. |
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218 | This is same as ClpModel one, but sets scaling on etc. */ |
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219 | void borrowModel(ClpModel & otherModel); |
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220 | void borrowModel(ClpSimplex & otherModel); |
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221 | /// Pass in Event handler (cloned and deleted at end) |
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222 | void passInEventHandler(const ClpEventHandler * eventHandler); |
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223 | /// Puts solution back into small model |
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224 | void getbackSolution(const ClpSimplex & smallModel, const int * whichRow, const int * whichColumn); |
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225 | /** Load nonlinear part of problem from AMPL info |
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226 | Returns 0 if linear |
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227 | 1 if quadratic objective |
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228 | 2 if quadratic constraints |
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229 | 3 if nonlinear objective |
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230 | 4 if nonlinear constraints |
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231 | -1 on failure |
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232 | */ |
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233 | int loadNonLinear(void * info, int & numberConstraints, |
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234 | ClpConstraint ** & constraints); |
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235 | #ifdef ABC_INHERIT |
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236 | /// Loads tolerances etc |
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237 | void loadTolerancesEtc(const AbcTolerancesEtc & data); |
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238 | /// Unloads tolerances etc |
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239 | void unloadTolerancesEtc(AbcTolerancesEtc & data); |
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240 | #endif |
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241 | //@} |
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242 | |
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243 | /**@name Functions most useful to user */ |
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244 | //@{ |
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245 | /** General solve algorithm which can do presolve. |
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246 | See ClpSolve.hpp for options |
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247 | */ |
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248 | int initialSolve(ClpSolve & options); |
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249 | /// Default initial solve |
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250 | int initialSolve(); |
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251 | /// Dual initial solve |
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252 | int initialDualSolve(); |
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253 | /// Primal initial solve |
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254 | int initialPrimalSolve(); |
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255 | /// Barrier initial solve |
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256 | int initialBarrierSolve(); |
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257 | /// Barrier initial solve, not to be followed by crossover |
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258 | int initialBarrierNoCrossSolve(); |
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259 | /** Dual algorithm - see ClpSimplexDual.hpp for method. |
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260 | ifValuesPass==2 just does values pass and then stops. |
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261 | |
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262 | startFinishOptions - bits |
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263 | 1 - do not delete work areas and factorization at end |
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264 | 2 - use old factorization if same number of rows |
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265 | 4 - skip as much initialization of work areas as possible |
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266 | (based on whatsChanged in clpmodel.hpp) ** work in progress |
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267 | maybe other bits later |
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268 | */ |
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269 | int dual(int ifValuesPass = 0, int startFinishOptions = 0); |
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270 | // If using Debug |
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271 | int dualDebug(int ifValuesPass = 0, int startFinishOptions = 0); |
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272 | /** Primal algorithm - see ClpSimplexPrimal.hpp for method. |
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273 | ifValuesPass==2 just does values pass and then stops. |
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274 | |
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275 | startFinishOptions - bits |
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276 | 1 - do not delete work areas and factorization at end |
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277 | 2 - use old factorization if same number of rows |
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278 | 4 - skip as much initialization of work areas as possible |
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279 | (based on whatsChanged in clpmodel.hpp) ** work in progress |
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280 | maybe other bits later |
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281 | */ |
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282 | int primal(int ifValuesPass = 0, int startFinishOptions = 0); |
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283 | /** Solves nonlinear problem using SLP - may be used as crash |
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284 | for other algorithms when number of iterations small. |
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285 | Also exits if all problematical variables are changing |
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286 | less than deltaTolerance |
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287 | */ |
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288 | int nonlinearSLP(int numberPasses, double deltaTolerance); |
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289 | /** Solves problem with nonlinear constraints using SLP - may be used as crash |
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290 | for other algorithms when number of iterations small. |
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291 | Also exits if all problematical variables are changing |
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292 | less than deltaTolerance |
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293 | */ |
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294 | int nonlinearSLP(int numberConstraints, ClpConstraint ** constraints, |
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295 | int numberPasses, double deltaTolerance); |
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296 | /** Solves using barrier (assumes you have good cholesky factor code). |
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297 | Does crossover to simplex if asked*/ |
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298 | int barrier(bool crossover = true); |
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299 | /** Solves non-linear using reduced gradient. Phase = 0 get feasible, |
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300 | =1 use solution */ |
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301 | int reducedGradient(int phase = 0); |
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302 | /// Solve using structure of model and maybe in parallel |
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303 | int solve(CoinStructuredModel * model); |
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304 | #ifdef ABC_INHERIT |
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305 | /** solvetype 0 for dual, 1 for primal |
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306 | startup 1 for values pass |
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307 | interrupt whether to pass across interrupt handler |
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308 | */ |
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309 | void dealWithAbc(int solveType,int startUp,bool interrupt=false); |
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310 | #endif |
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311 | /** This loads a model from a CoinStructuredModel object - returns number of errors. |
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312 | If originalOrder then keep to order stored in blocks, |
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313 | otherwise first column/rows correspond to first block - etc. |
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314 | If keepSolution true and size is same as current then |
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315 | keeps current status and solution |
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316 | */ |
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317 | int loadProblem ( CoinStructuredModel & modelObject, |
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318 | bool originalOrder = true, bool keepSolution = false); |
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319 | /** |
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320 | When scaling is on it is possible that the scaled problem |
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321 | is feasible but the unscaled is not. Clp returns a secondary |
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322 | status code to that effect. This option allows for a cleanup. |
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323 | If you use it I would suggest 1. |
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324 | This only affects actions when scaled optimal |
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325 | 0 - no action |
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326 | 1 - clean up using dual if primal infeasibility |
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327 | 2 - clean up using dual if dual infeasibility |
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328 | 3 - clean up using dual if primal or dual infeasibility |
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329 | 11,12,13 - as 1,2,3 but use primal |
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330 | |
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331 | return code as dual/primal |
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332 | */ |
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333 | int cleanup(int cleanupScaling); |
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334 | /** Dual ranging. |
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335 | This computes increase/decrease in cost for each given variable and corresponding |
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336 | sequence numbers which would change basis. Sequence numbers are 0..numberColumns |
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337 | and numberColumns.. for artificials/slacks. |
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338 | For non-basic variables the information is trivial to compute and the change in cost is just minus the |
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339 | reduced cost and the sequence number will be that of the non-basic variables. |
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340 | For basic variables a ratio test is between the reduced costs for non-basic variables |
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341 | and the row of the tableau corresponding to the basic variable. |
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342 | The increase/decrease value is always >= 0.0 |
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343 | |
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344 | Up to user to provide correct length arrays where each array is of length numberCheck. |
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345 | which contains list of variables for which information is desired. All other |
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346 | arrays will be filled in by function. If fifth entry in which is variable 7 then fifth entry in output arrays |
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347 | will be information for variable 7. |
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348 | |
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349 | If valueIncrease/Decrease not NULL (both must be NULL or both non NULL) then these are filled with |
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350 | the value of variable if such a change in cost were made (the existing bounds are ignored) |
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351 | |
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352 | Returns non-zero if infeasible unbounded etc |
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353 | */ |
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354 | int dualRanging(int numberCheck, const int * which, |
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355 | double * costIncrease, int * sequenceIncrease, |
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356 | double * costDecrease, int * sequenceDecrease, |
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357 | double * valueIncrease = NULL, double * valueDecrease = NULL); |
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358 | /** Primal ranging. |
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359 | This computes increase/decrease in value for each given variable and corresponding |
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360 | sequence numbers which would change basis. Sequence numbers are 0..numberColumns |
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361 | and numberColumns.. for artificials/slacks. |
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362 | This should only be used for non-basic variabls as otherwise information is pretty useless |
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363 | For basic variables the sequence number will be that of the basic variables. |
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364 | |
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365 | Up to user to provide correct length arrays where each array is of length numberCheck. |
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366 | which contains list of variables for which information is desired. All other |
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367 | arrays will be filled in by function. If fifth entry in which is variable 7 then fifth entry in output arrays |
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368 | will be information for variable 7. |
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369 | |
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370 | Returns non-zero if infeasible unbounded etc |
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371 | */ |
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372 | int primalRanging(int numberCheck, const int * which, |
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373 | double * valueIncrease, int * sequenceIncrease, |
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374 | double * valueDecrease, int * sequenceDecrease); |
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375 | /** |
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376 | Modifies coefficients etc and if necessary pivots in and out. |
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377 | All at same status will be done (basis may go singular). |
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378 | User can tell which others have been done (i.e. if status matches). |
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379 | If called from outside will change status and return 0. |
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380 | If called from event handler returns non-zero if user has to take action. |
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381 | indices>=numberColumns are slacks (obviously no coefficients) |
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382 | status array is (char) Status enum |
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383 | */ |
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384 | int modifyCoefficientsAndPivot(int number, |
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385 | const int * which, |
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386 | const CoinBigIndex * start, |
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387 | const int * row, |
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388 | const double * newCoefficient, |
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389 | const unsigned char * newStatus=NULL, |
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390 | const double * newLower=NULL, |
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391 | const double * newUpper=NULL, |
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392 | const double * newObjective=NULL); |
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393 | /** Take out duplicate rows (includes scaled rows and intersections). |
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394 | On exit whichRows has rows to delete - return code is number can be deleted |
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395 | or -1 if would be infeasible. |
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396 | If tolerance is -1.0 use primalTolerance for equality rows and infeasibility |
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397 | If cleanUp not zero then spend more time trying to leave more stable row |
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398 | and make row bounds exact multiple of cleanUp if close enough |
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399 | */ |
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400 | int outDuplicateRows(int numberLook,int * whichRows, bool noOverlaps=false, double tolerance=-1.0, |
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401 | double cleanUp=0.0); |
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402 | /** Try simple crash like techniques to get closer to primal feasibility |
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403 | returns final sum of infeasibilities */ |
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404 | double moveTowardsPrimalFeasible(); |
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405 | /** Try simple crash like techniques to remove super basic slacks |
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406 | but only if > threshold */ |
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407 | void removeSuperBasicSlacks(int threshold=0); |
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408 | /** Mini presolve (faster) |
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409 | Char arrays must be numberRows and numberColumns long |
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410 | on entry second part must be filled in as follows - |
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411 | 0 - possible |
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412 | >0 - take out and do something (depending on value - TBD) |
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413 | -1 row/column can't vanish but can have entries removed/changed |
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414 | -2 don't touch at all |
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415 | on exit <=0 ones will be in presolved problem |
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416 | struct will be created and will be long enough |
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417 | (information on length etc in first entry) |
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418 | user must delete struct |
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419 | */ |
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420 | ClpSimplex * miniPresolve(char * rowType, char * columnType,void ** info); |
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421 | /// After mini presolve |
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422 | void miniPostsolve(const ClpSimplex * presolvedModel,void * info); |
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423 | /** Write the basis in MPS format to the specified file. |
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424 | If writeValues true writes values of structurals |
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425 | (and adds VALUES to end of NAME card) |
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426 | |
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427 | Row and column names may be null. |
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428 | formatType is |
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429 | <ul> |
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430 | <li> 0 - normal |
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431 | <li> 1 - extra accuracy |
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432 | <li> 2 - IEEE hex (later) |
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433 | </ul> |
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434 | |
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435 | Returns non-zero on I/O error |
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436 | */ |
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437 | int writeBasis(const char *filename, |
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438 | bool writeValues = false, |
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439 | int formatType = 0) const; |
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440 | /** Read a basis from the given filename, |
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441 | returns -1 on file error, 0 if no values, 1 if values */ |
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442 | int readBasis(const char *filename); |
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443 | /// Returns a basis (to be deleted by user) |
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444 | CoinWarmStartBasis * getBasis() const; |
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445 | /// Passes in factorization |
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446 | void setFactorization( ClpFactorization & factorization); |
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447 | // Swaps factorization |
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448 | ClpFactorization * swapFactorization( ClpFactorization * factorization); |
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449 | /// Copies in factorization to existing one |
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450 | void copyFactorization( ClpFactorization & factorization); |
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451 | /** Tightens primal bounds to make dual faster. Unless |
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452 | fixed or doTight>10, bounds are slightly looser than they could be. |
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453 | This is to make dual go faster and is probably not needed |
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454 | with a presolve. Returns non-zero if problem infeasible. |
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455 | |
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456 | Fudge for branch and bound - put bounds on columns of factor * |
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457 | largest value (at continuous) - should improve stability |
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458 | in branch and bound on infeasible branches (0.0 is off) |
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459 | */ |
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460 | int tightenPrimalBounds(double factor = 0.0, int doTight = 0, bool tightIntegers = false); |
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461 | /** Crash - at present just aimed at dual, returns |
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462 | -2 if dual preferred and crash basis created |
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463 | -1 if dual preferred and all slack basis preferred |
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464 | 0 if basis going in was not all slack |
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465 | 1 if primal preferred and all slack basis preferred |
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466 | 2 if primal preferred and crash basis created. |
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467 | |
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468 | if gap between bounds <="gap" variables can be flipped |
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469 | ( If pivot -1 then can be made super basic!) |
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470 | |
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471 | If "pivot" is |
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472 | -1 No pivoting - always primal |
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473 | 0 No pivoting (so will just be choice of algorithm) |
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474 | 1 Simple pivoting e.g. gub |
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475 | 2 Mini iterations |
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476 | */ |
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477 | int crash(double gap, int pivot); |
---|
478 | /// Sets row pivot choice algorithm in dual |
---|
479 | void setDualRowPivotAlgorithm(ClpDualRowPivot & choice); |
---|
480 | /// Sets column pivot choice algorithm in primal |
---|
481 | void setPrimalColumnPivotAlgorithm(ClpPrimalColumnPivot & choice); |
---|
482 | /** For strong branching. On input lower and upper are new bounds |
---|
483 | while on output they are change in objective function values |
---|
484 | (>1.0e50 infeasible). |
---|
485 | Return code is 0 if nothing interesting, -1 if infeasible both |
---|
486 | ways and +1 if infeasible one way (check values to see which one(s)) |
---|
487 | Solutions are filled in as well - even down, odd up - also |
---|
488 | status and number of iterations |
---|
489 | */ |
---|
490 | int strongBranching(int numberVariables, const int * variables, |
---|
491 | double * newLower, double * newUpper, |
---|
492 | double ** outputSolution, |
---|
493 | int * outputStatus, int * outputIterations, |
---|
494 | bool stopOnFirstInfeasible = true, |
---|
495 | bool alwaysFinish = false, |
---|
496 | int startFinishOptions = 0); |
---|
497 | /// Fathom - 1 if solution |
---|
498 | int fathom(void * stuff); |
---|
499 | /** Do up to N deep - returns |
---|
500 | -1 - no solution nNodes_ valid nodes |
---|
501 | >= if solution and that node gives solution |
---|
502 | ClpNode array is 2**N long. Values for N and |
---|
503 | array are in stuff (nNodes_ also in stuff) */ |
---|
504 | int fathomMany(void * stuff); |
---|
505 | /// Double checks OK |
---|
506 | double doubleCheck(); |
---|
507 | /// Starts Fast dual2 |
---|
508 | int startFastDual2(ClpNodeStuff * stuff); |
---|
509 | /// Like Fast dual |
---|
510 | int fastDual2(ClpNodeStuff * stuff); |
---|
511 | /// Stops Fast dual2 |
---|
512 | void stopFastDual2(ClpNodeStuff * stuff); |
---|
513 | /** Deals with crunch aspects |
---|
514 | mode 0 - in |
---|
515 | 1 - out with solution |
---|
516 | 2 - out without solution |
---|
517 | returns small model or NULL |
---|
518 | */ |
---|
519 | ClpSimplex * fastCrunch(ClpNodeStuff * stuff, int mode); |
---|
520 | //@} |
---|
521 | |
---|
522 | /**@name Needed for functionality of OsiSimplexInterface */ |
---|
523 | //@{ |
---|
524 | /** Pivot in a variable and out a variable. Returns 0 if okay, |
---|
525 | 1 if inaccuracy forced re-factorization, -1 if would be singular. |
---|
526 | Also updates primal/dual infeasibilities. |
---|
527 | Assumes sequenceIn_ and pivotRow_ set and also directionIn and Out. |
---|
528 | */ |
---|
529 | int pivot(); |
---|
530 | |
---|
531 | /** Pivot in a variable and choose an outgoing one. Assumes primal |
---|
532 | feasible - will not go through a bound. Returns step length in theta |
---|
533 | Returns ray in ray_ (or NULL if no pivot) |
---|
534 | Return codes as before but -1 means no acceptable pivot |
---|
535 | */ |
---|
536 | int primalPivotResult(); |
---|
537 | |
---|
538 | /** Pivot out a variable and choose an incoing one. Assumes dual |
---|
539 | feasible - will not go through a reduced cost. |
---|
540 | Returns step length in theta |
---|
541 | Return codes as before but -1 means no acceptable pivot |
---|
542 | */ |
---|
543 | int dualPivotResultPart1(); |
---|
544 | /** Do actual pivot |
---|
545 | state is 0 if need tableau column, 1 if in rowArray_[1] |
---|
546 | */ |
---|
547 | int pivotResultPart2(int algorithm,int state); |
---|
548 | |
---|
549 | /** Common bits of coding for dual and primal. Return 0 if okay, |
---|
550 | 1 if bad matrix, 2 if very bad factorization |
---|
551 | |
---|
552 | startFinishOptions - bits |
---|
553 | 1 - do not delete work areas and factorization at end |
---|
554 | 2 - use old factorization if same number of rows |
---|
555 | 4 - skip as much initialization of work areas as possible |
---|
556 | (based on whatsChanged in clpmodel.hpp) ** work in progress |
---|
557 | maybe other bits later |
---|
558 | |
---|
559 | */ |
---|
560 | int startup(int ifValuesPass, int startFinishOptions = 0); |
---|
561 | void finish(int startFinishOptions = 0); |
---|
562 | |
---|
563 | /** Factorizes and returns true if optimal. Used by user */ |
---|
564 | bool statusOfProblem(bool initial = false); |
---|
565 | /// If user left factorization frequency then compute |
---|
566 | void defaultFactorizationFrequency(); |
---|
567 | /// Copy across enabled stuff from one solver to another |
---|
568 | void copyEnabledStuff(const ClpSimplex * rhs); |
---|
569 | //@} |
---|
570 | |
---|
571 | /**@name most useful gets and sets */ |
---|
572 | //@{ |
---|
573 | /// If problem is primal feasible |
---|
574 | inline bool primalFeasible() const { |
---|
575 | return (numberPrimalInfeasibilities_ == 0); |
---|
576 | } |
---|
577 | /// If problem is dual feasible |
---|
578 | inline bool dualFeasible() const { |
---|
579 | return (numberDualInfeasibilities_ == 0); |
---|
580 | } |
---|
581 | /// factorization |
---|
582 | inline ClpFactorization * factorization() const { |
---|
583 | return factorization_; |
---|
584 | } |
---|
585 | /// Sparsity on or off |
---|
586 | bool sparseFactorization() const; |
---|
587 | void setSparseFactorization(bool value); |
---|
588 | /// Factorization frequency |
---|
589 | int factorizationFrequency() const; |
---|
590 | void setFactorizationFrequency(int value); |
---|
591 | /// Dual bound |
---|
592 | inline double dualBound() const { |
---|
593 | return dualBound_; |
---|
594 | } |
---|
595 | void setDualBound(double value); |
---|
596 | /// Infeasibility cost |
---|
597 | inline double infeasibilityCost() const { |
---|
598 | return infeasibilityCost_; |
---|
599 | } |
---|
600 | void setInfeasibilityCost(double value); |
---|
601 | /** Amount of print out: |
---|
602 | 0 - none |
---|
603 | 1 - just final |
---|
604 | 2 - just factorizations |
---|
605 | 3 - as 2 plus a bit more |
---|
606 | 4 - verbose |
---|
607 | above that 8,16,32 etc just for selective debug |
---|
608 | */ |
---|
609 | /** Perturbation: |
---|
610 | 50 - switch on perturbation |
---|
611 | 100 - auto perturb if takes too long (1.0e-6 largest nonzero) |
---|
612 | 101 - we are perturbed |
---|
613 | 102 - don't try perturbing again |
---|
614 | default is 100 |
---|
615 | others are for playing |
---|
616 | */ |
---|
617 | inline int perturbation() const { |
---|
618 | return perturbation_; |
---|
619 | } |
---|
620 | void setPerturbation(int value); |
---|
621 | /// Current (or last) algorithm |
---|
622 | inline int algorithm() const { |
---|
623 | return algorithm_; |
---|
624 | } |
---|
625 | /// Set algorithm |
---|
626 | inline void setAlgorithm(int value) { |
---|
627 | algorithm_ = value; |
---|
628 | } |
---|
629 | /// Return true if the objective limit test can be relied upon |
---|
630 | bool isObjectiveLimitTestValid() const ; |
---|
631 | /// Sum of dual infeasibilities |
---|
632 | inline double sumDualInfeasibilities() const { |
---|
633 | return sumDualInfeasibilities_; |
---|
634 | } |
---|
635 | inline void setSumDualInfeasibilities(double value) { |
---|
636 | sumDualInfeasibilities_ = value; |
---|
637 | } |
---|
638 | /// Sum of relaxed dual infeasibilities |
---|
639 | inline double sumOfRelaxedDualInfeasibilities() const { |
---|
640 | return sumOfRelaxedDualInfeasibilities_; |
---|
641 | } |
---|
642 | inline void setSumOfRelaxedDualInfeasibilities(double value) { |
---|
643 | sumOfRelaxedDualInfeasibilities_ = value; |
---|
644 | } |
---|
645 | /// Number of dual infeasibilities |
---|
646 | inline int numberDualInfeasibilities() const { |
---|
647 | return numberDualInfeasibilities_; |
---|
648 | } |
---|
649 | inline void setNumberDualInfeasibilities(int value) { |
---|
650 | numberDualInfeasibilities_ = value; |
---|
651 | } |
---|
652 | /// Number of dual infeasibilities (without free) |
---|
653 | inline int numberDualInfeasibilitiesWithoutFree() const { |
---|
654 | return numberDualInfeasibilitiesWithoutFree_; |
---|
655 | } |
---|
656 | /// Sum of primal infeasibilities |
---|
657 | inline double sumPrimalInfeasibilities() const { |
---|
658 | return sumPrimalInfeasibilities_; |
---|
659 | } |
---|
660 | inline void setSumPrimalInfeasibilities(double value) { |
---|
661 | sumPrimalInfeasibilities_ = value; |
---|
662 | } |
---|
663 | /// Sum of relaxed primal infeasibilities |
---|
664 | inline double sumOfRelaxedPrimalInfeasibilities() const { |
---|
665 | return sumOfRelaxedPrimalInfeasibilities_; |
---|
666 | } |
---|
667 | inline void setSumOfRelaxedPrimalInfeasibilities(double value) { |
---|
668 | sumOfRelaxedPrimalInfeasibilities_ = value; |
---|
669 | } |
---|
670 | /// Number of primal infeasibilities |
---|
671 | inline int numberPrimalInfeasibilities() const { |
---|
672 | return numberPrimalInfeasibilities_; |
---|
673 | } |
---|
674 | inline void setNumberPrimalInfeasibilities(int value) { |
---|
675 | numberPrimalInfeasibilities_ = value; |
---|
676 | } |
---|
677 | /** Save model to file, returns 0 if success. This is designed for |
---|
678 | use outside algorithms so does not save iterating arrays etc. |
---|
679 | It does not save any messaging information. |
---|
680 | Does not save scaling values. |
---|
681 | It does not know about all types of virtual functions. |
---|
682 | */ |
---|
683 | int saveModel(const char * fileName); |
---|
684 | /** Restore model from file, returns 0 if success, |
---|
685 | deletes current model */ |
---|
686 | int restoreModel(const char * fileName); |
---|
687 | |
---|
688 | /** Just check solution (for external use) - sets sum of |
---|
689 | infeasibilities etc. |
---|
690 | If setToBounds 0 then primal column values not changed |
---|
691 | and used to compute primal row activity values. If 1 or 2 |
---|
692 | then status used - so all nonbasic variables set to |
---|
693 | indicated bound and if any values changed (or ==2) basic values re-computed. |
---|
694 | */ |
---|
695 | void checkSolution(int setToBounds = 0); |
---|
696 | /** Just check solution (for internal use) - sets sum of |
---|
697 | infeasibilities etc. */ |
---|
698 | void checkSolutionInternal(); |
---|
699 | /// Check unscaled primal solution but allow for rounding error |
---|
700 | void checkUnscaledSolution(); |
---|
701 | /// Useful row length arrays (0,1,2,3,4,5) |
---|
702 | inline CoinIndexedVector * rowArray(int index) const { |
---|
703 | return rowArray_[index]; |
---|
704 | } |
---|
705 | /// Useful column length arrays (0,1,2,3,4,5) |
---|
706 | inline CoinIndexedVector * columnArray(int index) const { |
---|
707 | return columnArray_[index]; |
---|
708 | } |
---|
709 | //@} |
---|
710 | |
---|
711 | /******************** End of most useful part **************/ |
---|
712 | /**@name Functions less likely to be useful to casual user */ |
---|
713 | //@{ |
---|
714 | /** Given an existing factorization computes and checks |
---|
715 | primal and dual solutions. Uses input arrays for variables at |
---|
716 | bounds. Returns feasibility states */ |
---|
717 | int getSolution ( const double * rowActivities, |
---|
718 | const double * columnActivities); |
---|
719 | /** Given an existing factorization computes and checks |
---|
720 | primal and dual solutions. Uses current problem arrays for |
---|
721 | bounds. Returns feasibility states */ |
---|
722 | int getSolution (); |
---|
723 | /** Constructs a non linear cost from list of non-linearities (columns only) |
---|
724 | First lower of each column is taken as real lower |
---|
725 | Last lower is taken as real upper and cost ignored |
---|
726 | |
---|
727 | Returns nonzero if bad data e.g. lowers not monotonic |
---|
728 | */ |
---|
729 | int createPiecewiseLinearCosts(const int * starts, |
---|
730 | const double * lower, const double * gradient); |
---|
731 | /// dual row pivot choice |
---|
732 | inline ClpDualRowPivot * dualRowPivot() const { |
---|
733 | return dualRowPivot_; |
---|
734 | } |
---|
735 | /// primal column pivot choice |
---|
736 | inline ClpPrimalColumnPivot * primalColumnPivot() const { |
---|
737 | return primalColumnPivot_; |
---|
738 | } |
---|
739 | /// Returns true if model looks OK |
---|
740 | inline bool goodAccuracy() const { |
---|
741 | return (largestPrimalError_ < 1.0e-7 && largestDualError_ < 1.0e-7); |
---|
742 | } |
---|
743 | /** Return model - updates any scalars */ |
---|
744 | void returnModel(ClpSimplex & otherModel); |
---|
745 | /** Factorizes using current basis. |
---|
746 | solveType - 1 iterating, 0 initial, -1 external |
---|
747 | If 10 added then in primal values pass |
---|
748 | Return codes are as from ClpFactorization unless initial factorization |
---|
749 | when total number of singularities is returned. |
---|
750 | Special case is numberRows_+1 -> all slack basis. |
---|
751 | */ |
---|
752 | int internalFactorize(int solveType); |
---|
753 | /// Save data |
---|
754 | ClpDataSave saveData() ; |
---|
755 | /// Restore data |
---|
756 | void restoreData(ClpDataSave saved); |
---|
757 | /// Clean up status |
---|
758 | void cleanStatus(); |
---|
759 | /// Factorizes using current basis. For external use |
---|
760 | int factorize(); |
---|
761 | /** Computes duals from scratch. If givenDjs then |
---|
762 | allows for nonzero basic djs */ |
---|
763 | void computeDuals(double * givenDjs); |
---|
764 | /// Computes primals from scratch |
---|
765 | void computePrimals ( const double * rowActivities, |
---|
766 | const double * columnActivities); |
---|
767 | /** Adds multiple of a column into an array */ |
---|
768 | void add(double * array, |
---|
769 | int column, double multiplier) const; |
---|
770 | /** |
---|
771 | Unpacks one column of the matrix into indexed array |
---|
772 | Uses sequenceIn_ |
---|
773 | Also applies scaling if needed |
---|
774 | */ |
---|
775 | void unpack(CoinIndexedVector * rowArray) const ; |
---|
776 | /** |
---|
777 | Unpacks one column of the matrix into indexed array |
---|
778 | Slack if sequence>= numberColumns |
---|
779 | Also applies scaling if needed |
---|
780 | */ |
---|
781 | void unpack(CoinIndexedVector * rowArray, int sequence) const; |
---|
782 | /** |
---|
783 | Unpacks one column of the matrix into indexed array |
---|
784 | ** as packed vector |
---|
785 | Uses sequenceIn_ |
---|
786 | Also applies scaling if needed |
---|
787 | */ |
---|
788 | void unpackPacked(CoinIndexedVector * rowArray) ; |
---|
789 | /** |
---|
790 | Unpacks one column of the matrix into indexed array |
---|
791 | ** as packed vector |
---|
792 | Slack if sequence>= numberColumns |
---|
793 | Also applies scaling if needed |
---|
794 | */ |
---|
795 | void unpackPacked(CoinIndexedVector * rowArray, int sequence); |
---|
796 | #ifndef CLP_USER_DRIVEN |
---|
797 | protected: |
---|
798 | #endif |
---|
799 | /** |
---|
800 | This does basis housekeeping and does values for in/out variables. |
---|
801 | Can also decide to re-factorize |
---|
802 | */ |
---|
803 | int housekeeping(double objectiveChange); |
---|
804 | /** This sets largest infeasibility and most infeasible and sum |
---|
805 | and number of infeasibilities (Primal) */ |
---|
806 | void checkPrimalSolution(const double * rowActivities = NULL, |
---|
807 | const double * columnActivies = NULL); |
---|
808 | /** This sets largest infeasibility and most infeasible and sum |
---|
809 | and number of infeasibilities (Dual) */ |
---|
810 | void checkDualSolution(); |
---|
811 | /** This sets sum and number of infeasibilities (Dual and Primal) */ |
---|
812 | void checkBothSolutions(); |
---|
813 | /** If input negative scales objective so maximum <= -value |
---|
814 | and returns scale factor used. If positive unscales and also |
---|
815 | redoes dual stuff |
---|
816 | */ |
---|
817 | double scaleObjective(double value); |
---|
818 | /// Solve using Dantzig-Wolfe decomposition and maybe in parallel |
---|
819 | int solveDW(CoinStructuredModel * model); |
---|
820 | /// Solve using Benders decomposition and maybe in parallel |
---|
821 | int solveBenders(CoinStructuredModel * model); |
---|
822 | public: |
---|
823 | /** For advanced use. When doing iterative solves things can get |
---|
824 | nasty so on values pass if incoming solution has largest |
---|
825 | infeasibility < incomingInfeasibility throw out variables |
---|
826 | from basis until largest infeasibility < allowedInfeasibility |
---|
827 | or incoming largest infeasibility. |
---|
828 | If allowedInfeasibility>= incomingInfeasibility this is |
---|
829 | always possible altough you may end up with an all slack basis. |
---|
830 | |
---|
831 | Defaults are 1.0,10.0 |
---|
832 | */ |
---|
833 | void setValuesPassAction(double incomingInfeasibility, |
---|
834 | double allowedInfeasibility); |
---|
835 | /** Get a clean factorization - i.e. throw out singularities |
---|
836 | may do more later */ |
---|
837 | int cleanFactorization(int ifValuesPass); |
---|
838 | //@} |
---|
839 | /**@name most useful gets and sets */ |
---|
840 | //@{ |
---|
841 | public: |
---|
842 | /// Initial value for alpha accuracy calculation (-1.0 off) |
---|
843 | inline double alphaAccuracy() const { |
---|
844 | return alphaAccuracy_; |
---|
845 | } |
---|
846 | inline void setAlphaAccuracy(double value) { |
---|
847 | alphaAccuracy_ = value; |
---|
848 | } |
---|
849 | public: |
---|
850 | /// Objective value |
---|
851 | //inline double objectiveValue() const { |
---|
852 | //return (objectiveValue_-bestPossibleImprovement_)*optimizationDirection_ - dblParam_[ClpObjOffset]; |
---|
853 | //} |
---|
854 | /// Set disaster handler |
---|
855 | inline void setDisasterHandler(ClpDisasterHandler * handler) { |
---|
856 | disasterArea_ = handler; |
---|
857 | } |
---|
858 | /// Get disaster handler |
---|
859 | inline ClpDisasterHandler * disasterHandler() const { |
---|
860 | return disasterArea_; |
---|
861 | } |
---|
862 | /// Large bound value (for complementarity etc) |
---|
863 | inline double largeValue() const { |
---|
864 | return largeValue_; |
---|
865 | } |
---|
866 | void setLargeValue( double value) ; |
---|
867 | /// Largest error on Ax-b |
---|
868 | inline double largestPrimalError() const { |
---|
869 | return largestPrimalError_; |
---|
870 | } |
---|
871 | /// Largest error on basic duals |
---|
872 | inline double largestDualError() const { |
---|
873 | return largestDualError_; |
---|
874 | } |
---|
875 | /// Largest error on Ax-b |
---|
876 | inline void setLargestPrimalError(double value) { |
---|
877 | largestPrimalError_ = value; |
---|
878 | } |
---|
879 | /// Largest error on basic duals |
---|
880 | inline void setLargestDualError(double value) { |
---|
881 | largestDualError_ = value; |
---|
882 | } |
---|
883 | /// Get zero tolerance |
---|
884 | inline double zeroTolerance() const { |
---|
885 | return zeroTolerance_;/*factorization_->zeroTolerance();*/ |
---|
886 | } |
---|
887 | /// Set zero tolerance |
---|
888 | inline void setZeroTolerance( double value) { |
---|
889 | zeroTolerance_ = value; |
---|
890 | } |
---|
891 | /// Basic variables pivoting on which rows |
---|
892 | inline int * pivotVariable() const { |
---|
893 | return pivotVariable_; |
---|
894 | } |
---|
895 | /// If automatic scaling on |
---|
896 | inline bool automaticScaling() const { |
---|
897 | return automaticScale_ != 0; |
---|
898 | } |
---|
899 | inline void setAutomaticScaling(bool onOff) { |
---|
900 | automaticScale_ = onOff ? 1 : 0; |
---|
901 | } |
---|
902 | /// Current dual tolerance |
---|
903 | inline double currentDualTolerance() const { |
---|
904 | return dualTolerance_; |
---|
905 | } |
---|
906 | inline void setCurrentDualTolerance(double value) { |
---|
907 | dualTolerance_ = value; |
---|
908 | } |
---|
909 | /// Current primal tolerance |
---|
910 | inline double currentPrimalTolerance() const { |
---|
911 | return primalTolerance_; |
---|
912 | } |
---|
913 | inline void setCurrentPrimalTolerance(double value) { |
---|
914 | primalTolerance_ = value; |
---|
915 | } |
---|
916 | /// How many iterative refinements to do |
---|
917 | inline int numberRefinements() const { |
---|
918 | return numberRefinements_; |
---|
919 | } |
---|
920 | void setNumberRefinements( int value) ; |
---|
921 | /// Alpha (pivot element) for use by classes e.g. steepestedge |
---|
922 | inline double alpha() const { |
---|
923 | return alpha_; |
---|
924 | } |
---|
925 | inline void setAlpha(double value) { |
---|
926 | alpha_ = value; |
---|
927 | } |
---|
928 | /// Reduced cost of last incoming for use by classes e.g. steepestedge |
---|
929 | inline double dualIn() const { |
---|
930 | return dualIn_; |
---|
931 | } |
---|
932 | /// Set reduced cost of last incoming to force error |
---|
933 | inline void setDualIn(double value) { |
---|
934 | dualIn_ = value; |
---|
935 | } |
---|
936 | /// Pivot Row for use by classes e.g. steepestedge |
---|
937 | inline int pivotRow() const { |
---|
938 | return pivotRow_; |
---|
939 | } |
---|
940 | inline void setPivotRow(int value) { |
---|
941 | pivotRow_ = value; |
---|
942 | } |
---|
943 | /// value of incoming variable (in Dual) |
---|
944 | double valueIncomingDual() const; |
---|
945 | //@} |
---|
946 | |
---|
947 | #ifndef CLP_USER_DRIVEN |
---|
948 | protected: |
---|
949 | #endif |
---|
950 | /**@name protected methods */ |
---|
951 | //@{ |
---|
952 | /** May change basis and then returns number changed. |
---|
953 | Computation of solutions may be overriden by given pi and solution |
---|
954 | */ |
---|
955 | int gutsOfSolution ( double * givenDuals, |
---|
956 | const double * givenPrimals, |
---|
957 | bool valuesPass = false); |
---|
958 | /// Does most of deletion (0 = all, 1 = most, 2 most + factorization) |
---|
959 | void gutsOfDelete(int type); |
---|
960 | /// Does most of copying |
---|
961 | void gutsOfCopy(const ClpSimplex & rhs); |
---|
962 | /** puts in format I like (rowLower,rowUpper) also see StandardMatrix |
---|
963 | 1 bit does rows (now and columns), (2 bit does column bounds), 4 bit does objective(s). |
---|
964 | 8 bit does solution scaling in |
---|
965 | 16 bit does rowArray and columnArray indexed vectors |
---|
966 | and makes row copy if wanted, also sets columnStart_ etc |
---|
967 | Also creates scaling arrays if needed. It does scaling if needed. |
---|
968 | 16 also moves solutions etc in to work arrays |
---|
969 | On 16 returns false if problem "bad" i.e. matrix or bounds bad |
---|
970 | If startFinishOptions is -1 then called by user in getSolution |
---|
971 | so do arrays but keep pivotVariable_ |
---|
972 | */ |
---|
973 | bool createRim(int what, bool makeRowCopy = false, int startFinishOptions = 0); |
---|
974 | /// Does rows and columns |
---|
975 | void createRim1(bool initial); |
---|
976 | /// Does objective |
---|
977 | void createRim4(bool initial); |
---|
978 | /// Does rows and columns and objective |
---|
979 | void createRim5(bool initial); |
---|
980 | /** releases above arrays and does solution scaling out. May also |
---|
981 | get rid of factorization data - |
---|
982 | 0 get rid of nothing, 1 get rid of arrays, 2 also factorization |
---|
983 | */ |
---|
984 | void deleteRim(int getRidOfFactorizationData = 2); |
---|
985 | /// Sanity check on input rim data (after scaling) - returns true if okay |
---|
986 | bool sanityCheck(); |
---|
987 | //@} |
---|
988 | public: |
---|
989 | /**@name public methods */ |
---|
990 | //@{ |
---|
991 | /** Return row or column sections - not as much needed as it |
---|
992 | once was. These just map into single arrays */ |
---|
993 | inline double * solutionRegion(int section) const { |
---|
994 | if (!section) return rowActivityWork_; |
---|
995 | else return columnActivityWork_; |
---|
996 | } |
---|
997 | inline double * djRegion(int section) const { |
---|
998 | if (!section) return rowReducedCost_; |
---|
999 | else return reducedCostWork_; |
---|
1000 | } |
---|
1001 | inline double * lowerRegion(int section) const { |
---|
1002 | if (!section) return rowLowerWork_; |
---|
1003 | else return columnLowerWork_; |
---|
1004 | } |
---|
1005 | inline double * upperRegion(int section) const { |
---|
1006 | if (!section) return rowUpperWork_; |
---|
1007 | else return columnUpperWork_; |
---|
1008 | } |
---|
1009 | inline double * costRegion(int section) const { |
---|
1010 | if (!section) return rowObjectiveWork_; |
---|
1011 | else return objectiveWork_; |
---|
1012 | } |
---|
1013 | /// Return region as single array |
---|
1014 | inline double * solutionRegion() const { |
---|
1015 | return solution_; |
---|
1016 | } |
---|
1017 | inline double * djRegion() const { |
---|
1018 | return dj_; |
---|
1019 | } |
---|
1020 | inline double * lowerRegion() const { |
---|
1021 | return lower_; |
---|
1022 | } |
---|
1023 | inline double * upperRegion() const { |
---|
1024 | return upper_; |
---|
1025 | } |
---|
1026 | inline double * costRegion() const { |
---|
1027 | return cost_; |
---|
1028 | } |
---|
1029 | inline Status getStatus(int sequence) const { |
---|
1030 | return static_cast<Status> (status_[sequence] & 7); |
---|
1031 | } |
---|
1032 | inline void setStatus(int sequence, Status newstatus) { |
---|
1033 | unsigned char & st_byte = status_[sequence]; |
---|
1034 | st_byte = static_cast<unsigned char>(st_byte & ~7); |
---|
1035 | st_byte = static_cast<unsigned char>(st_byte | newstatus); |
---|
1036 | } |
---|
1037 | /// Start or reset using maximumRows_ and Columns_ - true if change |
---|
1038 | bool startPermanentArrays(); |
---|
1039 | /** Normally the first factorization does sparse coding because |
---|
1040 | the factorization could be singular. This allows initial dense |
---|
1041 | factorization when it is known to be safe |
---|
1042 | */ |
---|
1043 | void setInitialDenseFactorization(bool onOff); |
---|
1044 | bool initialDenseFactorization() const; |
---|
1045 | /** Return sequence In or Out */ |
---|
1046 | inline int sequenceIn() const { |
---|
1047 | return sequenceIn_; |
---|
1048 | } |
---|
1049 | inline int sequenceOut() const { |
---|
1050 | return sequenceOut_; |
---|
1051 | } |
---|
1052 | /** Set sequenceIn or Out */ |
---|
1053 | inline void setSequenceIn(int sequence) { |
---|
1054 | sequenceIn_ = sequence; |
---|
1055 | } |
---|
1056 | inline void setSequenceOut(int sequence) { |
---|
1057 | sequenceOut_ = sequence; |
---|
1058 | } |
---|
1059 | /** Return direction In or Out */ |
---|
1060 | inline int directionIn() const { |
---|
1061 | return directionIn_; |
---|
1062 | } |
---|
1063 | inline int directionOut() const { |
---|
1064 | return directionOut_; |
---|
1065 | } |
---|
1066 | /** Set directionIn or Out */ |
---|
1067 | inline void setDirectionIn(int direction) { |
---|
1068 | directionIn_ = direction; |
---|
1069 | } |
---|
1070 | inline void setDirectionOut(int direction) { |
---|
1071 | directionOut_ = direction; |
---|
1072 | } |
---|
1073 | /// Value of Out variable |
---|
1074 | inline double valueOut() const { |
---|
1075 | return valueOut_; |
---|
1076 | } |
---|
1077 | /// Set value of out variable |
---|
1078 | inline void setValueOut(double value) { |
---|
1079 | valueOut_ = value; |
---|
1080 | } |
---|
1081 | /// Dual value of Out variable |
---|
1082 | inline double dualOut() const { |
---|
1083 | return dualOut_; |
---|
1084 | } |
---|
1085 | /// Set dual value of out variable |
---|
1086 | inline void setDualOut(double value) { |
---|
1087 | dualOut_ = value; |
---|
1088 | } |
---|
1089 | /// Set lower of out variable |
---|
1090 | inline void setLowerOut(double value) { |
---|
1091 | lowerOut_ = value; |
---|
1092 | } |
---|
1093 | /// Set upper of out variable |
---|
1094 | inline void setUpperOut(double value) { |
---|
1095 | upperOut_ = value; |
---|
1096 | } |
---|
1097 | /// Set theta of out variable |
---|
1098 | inline void setTheta(double value) { |
---|
1099 | theta_ = value; |
---|
1100 | } |
---|
1101 | /// Returns 1 if sequence indicates column |
---|
1102 | inline int isColumn(int sequence) const { |
---|
1103 | return sequence < numberColumns_ ? 1 : 0; |
---|
1104 | } |
---|
1105 | /// Returns sequence number within section |
---|
1106 | inline int sequenceWithin(int sequence) const { |
---|
1107 | return sequence < numberColumns_ ? sequence : sequence - numberColumns_; |
---|
1108 | } |
---|
1109 | /// Return row or column values |
---|
1110 | inline double solution(int sequence) { |
---|
1111 | return solution_[sequence]; |
---|
1112 | } |
---|
1113 | /// Return address of row or column values |
---|
1114 | inline double & solutionAddress(int sequence) { |
---|
1115 | return solution_[sequence]; |
---|
1116 | } |
---|
1117 | inline double reducedCost(int sequence) { |
---|
1118 | return dj_[sequence]; |
---|
1119 | } |
---|
1120 | inline double & reducedCostAddress(int sequence) { |
---|
1121 | return dj_[sequence]; |
---|
1122 | } |
---|
1123 | inline double lower(int sequence) { |
---|
1124 | return lower_[sequence]; |
---|
1125 | } |
---|
1126 | /// Return address of row or column lower bound |
---|
1127 | inline double & lowerAddress(int sequence) { |
---|
1128 | return lower_[sequence]; |
---|
1129 | } |
---|
1130 | inline double upper(int sequence) { |
---|
1131 | return upper_[sequence]; |
---|
1132 | } |
---|
1133 | /// Return address of row or column upper bound |
---|
1134 | inline double & upperAddress(int sequence) { |
---|
1135 | return upper_[sequence]; |
---|
1136 | } |
---|
1137 | inline double cost(int sequence) { |
---|
1138 | return cost_[sequence]; |
---|
1139 | } |
---|
1140 | /// Return address of row or column cost |
---|
1141 | inline double & costAddress(int sequence) { |
---|
1142 | return cost_[sequence]; |
---|
1143 | } |
---|
1144 | /// Return original lower bound |
---|
1145 | inline double originalLower(int iSequence) const { |
---|
1146 | if (iSequence < numberColumns_) return columnLower_[iSequence]; |
---|
1147 | else |
---|
1148 | return rowLower_[iSequence-numberColumns_]; |
---|
1149 | } |
---|
1150 | /// Return original lower bound |
---|
1151 | inline double originalUpper(int iSequence) const { |
---|
1152 | if (iSequence < numberColumns_) return columnUpper_[iSequence]; |
---|
1153 | else |
---|
1154 | return rowUpper_[iSequence-numberColumns_]; |
---|
1155 | } |
---|
1156 | /// Theta (pivot change) |
---|
1157 | inline double theta() const { |
---|
1158 | return theta_; |
---|
1159 | } |
---|
1160 | /** Best possible improvement using djs (primal) or |
---|
1161 | obj change by flipping bounds to make dual feasible (dual) */ |
---|
1162 | inline double bestPossibleImprovement() const { |
---|
1163 | return bestPossibleImprovement_; |
---|
1164 | } |
---|
1165 | /// Return pointer to details of costs |
---|
1166 | inline ClpNonLinearCost * nonLinearCost() const { |
---|
1167 | return nonLinearCost_; |
---|
1168 | } |
---|
1169 | /** Return more special options |
---|
1170 | 1 bit - if presolve says infeasible in ClpSolve return |
---|
1171 | 2 bit - if presolved problem infeasible return |
---|
1172 | 4 bit - keep arrays like upper_ around |
---|
1173 | 8 bit - if factorization kept can still declare optimal at once |
---|
1174 | 16 bit - if checking replaceColumn accuracy before updating |
---|
1175 | 32 bit - say optimal if primal feasible! |
---|
1176 | 64 bit - give up easily in dual (and say infeasible) |
---|
1177 | 128 bit - no objective, 0-1 and in B&B |
---|
1178 | 256 bit - in primal from dual or vice versa |
---|
1179 | 512 bit - alternative use of solveType_ |
---|
1180 | 1024 bit - don't do row copy of factorization |
---|
1181 | 2048 bit - perturb in complete fathoming |
---|
1182 | 4096 bit - try more for complete fathoming |
---|
1183 | 8192 bit - don't even think of using primal if user asks for dual (and vv) |
---|
1184 | 16384 bit - in initialSolve so be more flexible |
---|
1185 | debug |
---|
1186 | 32768 bit - do dual in netlibd |
---|
1187 | 65536 (*3) initial stateDualColumn |
---|
1188 | */ |
---|
1189 | inline int moreSpecialOptions() const { |
---|
1190 | return moreSpecialOptions_; |
---|
1191 | } |
---|
1192 | /** Set more special options |
---|
1193 | 1 bit - if presolve says infeasible in ClpSolve return |
---|
1194 | 2 bit - if presolved problem infeasible return |
---|
1195 | 4 bit - keep arrays like upper_ around |
---|
1196 | 8 bit - no free or superBasic variables |
---|
1197 | 16 bit - if checking replaceColumn accuracy before updating |
---|
1198 | 32 bit - say optimal if primal feasible! |
---|
1199 | 64 bit - give up easily in dual (and say infeasible) |
---|
1200 | 128 bit - no objective, 0-1 and in B&B |
---|
1201 | 256 bit - in primal from dual or vice versa |
---|
1202 | 512 bit - alternative use of solveType_ |
---|
1203 | 1024 bit - don't do row copy of factorization |
---|
1204 | 2048 bit - perturb in complete fathoming |
---|
1205 | 4096 bit - try more for complete fathoming |
---|
1206 | 8192 bit - don't even think of using primal if user asks for dual (and vv) |
---|
1207 | 16384 bit - in initialSolve so be more flexible |
---|
1208 | 32768 bit - don't swap algorithms from dual if small infeasibility |
---|
1209 | 65536 bit - perturb in postsolve cleanup (even if < 10000 rows) |
---|
1210 | */ |
---|
1211 | inline void setMoreSpecialOptions(int value) { |
---|
1212 | moreSpecialOptions_ = value; |
---|
1213 | } |
---|
1214 | //@} |
---|
1215 | /**@name status methods */ |
---|
1216 | //@{ |
---|
1217 | inline void setFakeBound(int sequence, FakeBound fakeBound) { |
---|
1218 | unsigned char & st_byte = status_[sequence]; |
---|
1219 | st_byte = static_cast<unsigned char>(st_byte & ~24); |
---|
1220 | st_byte = static_cast<unsigned char>(st_byte | (fakeBound << 3)); |
---|
1221 | } |
---|
1222 | inline FakeBound getFakeBound(int sequence) const { |
---|
1223 | return static_cast<FakeBound> ((status_[sequence] >> 3) & 3); |
---|
1224 | } |
---|
1225 | inline void setRowStatus(int sequence, Status newstatus) { |
---|
1226 | unsigned char & st_byte = status_[sequence+numberColumns_]; |
---|
1227 | st_byte = static_cast<unsigned char>(st_byte & ~7); |
---|
1228 | st_byte = static_cast<unsigned char>(st_byte | newstatus); |
---|
1229 | } |
---|
1230 | inline Status getRowStatus(int sequence) const { |
---|
1231 | return static_cast<Status> (status_[sequence+numberColumns_] & 7); |
---|
1232 | } |
---|
1233 | inline void setColumnStatus(int sequence, Status newstatus) { |
---|
1234 | unsigned char & st_byte = status_[sequence]; |
---|
1235 | st_byte = static_cast<unsigned char>(st_byte & ~7); |
---|
1236 | st_byte = static_cast<unsigned char>(st_byte | newstatus); |
---|
1237 | } |
---|
1238 | inline Status getColumnStatus(int sequence) const { |
---|
1239 | return static_cast<Status> (status_[sequence] & 7); |
---|
1240 | } |
---|
1241 | inline void setPivoted( int sequence) { |
---|
1242 | status_[sequence] = static_cast<unsigned char>(status_[sequence] | 32); |
---|
1243 | } |
---|
1244 | inline void clearPivoted( int sequence) { |
---|
1245 | status_[sequence] = static_cast<unsigned char>(status_[sequence] & ~32); |
---|
1246 | } |
---|
1247 | inline bool pivoted(int sequence) const { |
---|
1248 | return (((status_[sequence] >> 5) & 1) != 0); |
---|
1249 | } |
---|
1250 | /// To flag a variable (not inline to allow for column generation) |
---|
1251 | void setFlagged( int sequence); |
---|
1252 | inline void clearFlagged( int sequence) { |
---|
1253 | status_[sequence] = static_cast<unsigned char>(status_[sequence] & ~64); |
---|
1254 | } |
---|
1255 | inline bool flagged(int sequence) const { |
---|
1256 | return ((status_[sequence] & 64) != 0); |
---|
1257 | } |
---|
1258 | /// To say row active in primal pivot row choice |
---|
1259 | inline void setActive( int iRow) { |
---|
1260 | status_[iRow] = static_cast<unsigned char>(status_[iRow] | 128); |
---|
1261 | } |
---|
1262 | inline void clearActive( int iRow) { |
---|
1263 | status_[iRow] = static_cast<unsigned char>(status_[iRow] & ~128); |
---|
1264 | } |
---|
1265 | inline bool active(int iRow) const { |
---|
1266 | return ((status_[iRow] & 128) != 0); |
---|
1267 | } |
---|
1268 | /** Set up status array (can be used by OsiClp). |
---|
1269 | Also can be used to set up all slack basis */ |
---|
1270 | void createStatus() ; |
---|
1271 | /** Sets up all slack basis and resets solution to |
---|
1272 | as it was after initial load or readMps */ |
---|
1273 | void allSlackBasis(bool resetSolution = false); |
---|
1274 | |
---|
1275 | /// So we know when to be cautious |
---|
1276 | inline int lastBadIteration() const { |
---|
1277 | return lastBadIteration_; |
---|
1278 | } |
---|
1279 | /// Set so we know when to be cautious |
---|
1280 | inline void setLastBadIteration(int value) { |
---|
1281 | lastBadIteration_=value; |
---|
1282 | } |
---|
1283 | /// Progress flag - at present 0 bit says artificials out |
---|
1284 | inline int progressFlag() const { |
---|
1285 | return (progressFlag_ & 3); |
---|
1286 | } |
---|
1287 | /// For dealing with all issues of cycling etc |
---|
1288 | inline ClpSimplexProgress * progress() |
---|
1289 | { return &progress_;} |
---|
1290 | /// Force re-factorization early value |
---|
1291 | inline int forceFactorization() const { |
---|
1292 | return forceFactorization_ ; |
---|
1293 | } |
---|
1294 | /// Force re-factorization early |
---|
1295 | inline void forceFactorization(int value) { |
---|
1296 | forceFactorization_ = value; |
---|
1297 | } |
---|
1298 | /// Raw objective value (so always minimize in primal) |
---|
1299 | inline double rawObjectiveValue() const { |
---|
1300 | return objectiveValue_; |
---|
1301 | } |
---|
1302 | /// Compute objective value from solution and put in objectiveValue_ |
---|
1303 | void computeObjectiveValue(bool useWorkingSolution = false); |
---|
1304 | /// Compute minimization objective value from internal solution without perturbation |
---|
1305 | double computeInternalObjectiveValue(); |
---|
1306 | /** Infeasibility/unbounded ray (NULL returned if none/wrong) |
---|
1307 | Up to user to use delete [] on these arrays. */ |
---|
1308 | double * infeasibilityRay(bool fullRay=false) const; |
---|
1309 | /** Number of extra rows. These are ones which will be dynamically created |
---|
1310 | each iteration. This is for GUB but may have other uses. |
---|
1311 | */ |
---|
1312 | inline int numberExtraRows() const { |
---|
1313 | return numberExtraRows_; |
---|
1314 | } |
---|
1315 | /** Maximum number of basic variables - can be more than number of rows if GUB |
---|
1316 | */ |
---|
1317 | inline int maximumBasic() const { |
---|
1318 | return maximumBasic_; |
---|
1319 | } |
---|
1320 | /// Iteration when we entered dual or primal |
---|
1321 | inline int baseIteration() const { |
---|
1322 | return baseIteration_; |
---|
1323 | } |
---|
1324 | /// Create C++ lines to get to current state |
---|
1325 | void generateCpp( FILE * fp, bool defaultFactor = false); |
---|
1326 | /// Gets clean and emptyish factorization |
---|
1327 | ClpFactorization * getEmptyFactorization(); |
---|
1328 | /// May delete or may make clean and emptyish factorization |
---|
1329 | void setEmptyFactorization(); |
---|
1330 | /// Move status and solution across |
---|
1331 | void moveInfo(const ClpSimplex & rhs, bool justStatus = false); |
---|
1332 | //@} |
---|
1333 | |
---|
1334 | ///@name Basis handling |
---|
1335 | // These are only to be used using startFinishOptions (ClpSimplexDual, ClpSimplexPrimal) |
---|
1336 | // *** At present only without scaling |
---|
1337 | // *** Slacks havve -1.0 element (so == row activity) - take care |
---|
1338 | ///Get a row of the tableau (slack part in slack if not NULL) |
---|
1339 | void getBInvARow(int row, double* z, double * slack = NULL); |
---|
1340 | |
---|
1341 | ///Get a row of the basis inverse |
---|
1342 | void getBInvRow(int row, double* z); |
---|
1343 | |
---|
1344 | ///Get a column of the tableau |
---|
1345 | void getBInvACol(int col, double* vec); |
---|
1346 | |
---|
1347 | ///Get a column of the basis inverse |
---|
1348 | void getBInvCol(int col, double* vec); |
---|
1349 | |
---|
1350 | /** Get basic indices (order of indices corresponds to the |
---|
1351 | order of elements in a vector retured by getBInvACol() and |
---|
1352 | getBInvCol()). |
---|
1353 | */ |
---|
1354 | void getBasics(int* index); |
---|
1355 | |
---|
1356 | //@} |
---|
1357 | //------------------------------------------------------------------------- |
---|
1358 | /**@name Changing bounds on variables and constraints */ |
---|
1359 | //@{ |
---|
1360 | /** Set an objective function coefficient */ |
---|
1361 | void setObjectiveCoefficient( int elementIndex, double elementValue ); |
---|
1362 | /** Set an objective function coefficient */ |
---|
1363 | inline void setObjCoeff( int elementIndex, double elementValue ) { |
---|
1364 | setObjectiveCoefficient( elementIndex, elementValue); |
---|
1365 | } |
---|
1366 | |
---|
1367 | /** Set a single column lower bound<br> |
---|
1368 | Use -DBL_MAX for -infinity. */ |
---|
1369 | void setColumnLower( int elementIndex, double elementValue ); |
---|
1370 | |
---|
1371 | /** Set a single column upper bound<br> |
---|
1372 | Use DBL_MAX for infinity. */ |
---|
1373 | void setColumnUpper( int elementIndex, double elementValue ); |
---|
1374 | |
---|
1375 | /** Set a single column lower and upper bound */ |
---|
1376 | void setColumnBounds( int elementIndex, |
---|
1377 | double lower, double upper ); |
---|
1378 | |
---|
1379 | /** Set the bounds on a number of columns simultaneously<br> |
---|
1380 | The default implementation just invokes setColLower() and |
---|
1381 | setColUpper() over and over again. |
---|
1382 | @param indexFirst,indexLast pointers to the beginning and after the |
---|
1383 | end of the array of the indices of the variables whose |
---|
1384 | <em>either</em> bound changes |
---|
1385 | @param boundList the new lower/upper bound pairs for the variables |
---|
1386 | */ |
---|
1387 | void setColumnSetBounds(const int* indexFirst, |
---|
1388 | const int* indexLast, |
---|
1389 | const double* boundList); |
---|
1390 | |
---|
1391 | /** Set a single column lower bound<br> |
---|
1392 | Use -DBL_MAX for -infinity. */ |
---|
1393 | inline void setColLower( int elementIndex, double elementValue ) { |
---|
1394 | setColumnLower(elementIndex, elementValue); |
---|
1395 | } |
---|
1396 | /** Set a single column upper bound<br> |
---|
1397 | Use DBL_MAX for infinity. */ |
---|
1398 | inline void setColUpper( int elementIndex, double elementValue ) { |
---|
1399 | setColumnUpper(elementIndex, elementValue); |
---|
1400 | } |
---|
1401 | |
---|
1402 | /** Set a single column lower and upper bound */ |
---|
1403 | inline void setColBounds( int elementIndex, |
---|
1404 | double newlower, double newupper ) { |
---|
1405 | setColumnBounds(elementIndex, newlower, newupper); |
---|
1406 | } |
---|
1407 | |
---|
1408 | /** Set the bounds on a number of columns simultaneously<br> |
---|
1409 | @param indexFirst,indexLast pointers to the beginning and after the |
---|
1410 | end of the array of the indices of the variables whose |
---|
1411 | <em>either</em> bound changes |
---|
1412 | @param boundList the new lower/upper bound pairs for the variables |
---|
1413 | */ |
---|
1414 | inline void setColSetBounds(const int* indexFirst, |
---|
1415 | const int* indexLast, |
---|
1416 | const double* boundList) { |
---|
1417 | setColumnSetBounds(indexFirst, indexLast, boundList); |
---|
1418 | } |
---|
1419 | |
---|
1420 | /** Set a single row lower bound<br> |
---|
1421 | Use -DBL_MAX for -infinity. */ |
---|
1422 | void setRowLower( int elementIndex, double elementValue ); |
---|
1423 | |
---|
1424 | /** Set a single row upper bound<br> |
---|
1425 | Use DBL_MAX for infinity. */ |
---|
1426 | void setRowUpper( int elementIndex, double elementValue ) ; |
---|
1427 | |
---|
1428 | /** Set a single row lower and upper bound */ |
---|
1429 | void setRowBounds( int elementIndex, |
---|
1430 | double lower, double upper ) ; |
---|
1431 | |
---|
1432 | /** Set the bounds on a number of rows simultaneously<br> |
---|
1433 | @param indexFirst,indexLast pointers to the beginning and after the |
---|
1434 | end of the array of the indices of the constraints whose |
---|
1435 | <em>either</em> bound changes |
---|
1436 | @param boundList the new lower/upper bound pairs for the constraints |
---|
1437 | */ |
---|
1438 | void setRowSetBounds(const int* indexFirst, |
---|
1439 | const int* indexLast, |
---|
1440 | const double* boundList); |
---|
1441 | /// Resizes rim part of model |
---|
1442 | void resize (int newNumberRows, int newNumberColumns); |
---|
1443 | |
---|
1444 | //@} |
---|
1445 | |
---|
1446 | ////////////////// data ////////////////// |
---|
1447 | protected: |
---|
1448 | |
---|
1449 | /**@name data. Many arrays have a row part and a column part. |
---|
1450 | There is a single array with both - columns then rows and |
---|
1451 | then normally two arrays pointing to rows and columns. The |
---|
1452 | single array is the owner of memory |
---|
1453 | */ |
---|
1454 | //@{ |
---|
1455 | /** Best possible improvement using djs (primal) or |
---|
1456 | obj change by flipping bounds to make dual feasible (dual) */ |
---|
1457 | double bestPossibleImprovement_; |
---|
1458 | /// Zero tolerance |
---|
1459 | double zeroTolerance_; |
---|
1460 | /// Sequence of worst (-1 if feasible) |
---|
1461 | int columnPrimalSequence_; |
---|
1462 | /// Sequence of worst (-1 if feasible) |
---|
1463 | int rowPrimalSequence_; |
---|
1464 | /// "Best" objective value |
---|
1465 | double bestObjectiveValue_; |
---|
1466 | /// More special options - see set for details |
---|
1467 | int moreSpecialOptions_; |
---|
1468 | /// Iteration when we entered dual or primal |
---|
1469 | int baseIteration_; |
---|
1470 | /// Primal tolerance needed to make dual feasible (<largeTolerance) |
---|
1471 | double primalToleranceToGetOptimal_; |
---|
1472 | /// Large bound value (for complementarity etc) |
---|
1473 | double largeValue_; |
---|
1474 | /// Largest error on Ax-b |
---|
1475 | double largestPrimalError_; |
---|
1476 | /// Largest error on basic duals |
---|
1477 | double largestDualError_; |
---|
1478 | /// For computing whether to re-factorize |
---|
1479 | double alphaAccuracy_; |
---|
1480 | /// Dual bound |
---|
1481 | double dualBound_; |
---|
1482 | /// Alpha (pivot element) |
---|
1483 | double alpha_; |
---|
1484 | /// Theta (pivot change) |
---|
1485 | double theta_; |
---|
1486 | /// Lower Bound on In variable |
---|
1487 | double lowerIn_; |
---|
1488 | /// Value of In variable |
---|
1489 | double valueIn_; |
---|
1490 | /// Upper Bound on In variable |
---|
1491 | double upperIn_; |
---|
1492 | /// Reduced cost of In variable |
---|
1493 | double dualIn_; |
---|
1494 | /// Lower Bound on Out variable |
---|
1495 | double lowerOut_; |
---|
1496 | /// Value of Out variable |
---|
1497 | double valueOut_; |
---|
1498 | /// Upper Bound on Out variable |
---|
1499 | double upperOut_; |
---|
1500 | /// Infeasibility (dual) or ? (primal) of Out variable |
---|
1501 | double dualOut_; |
---|
1502 | /// Current dual tolerance for algorithm |
---|
1503 | double dualTolerance_; |
---|
1504 | /// Current primal tolerance for algorithm |
---|
1505 | double primalTolerance_; |
---|
1506 | /// Sum of dual infeasibilities |
---|
1507 | double sumDualInfeasibilities_; |
---|
1508 | /// Sum of primal infeasibilities |
---|
1509 | double sumPrimalInfeasibilities_; |
---|
1510 | /// Weight assigned to being infeasible in primal |
---|
1511 | double infeasibilityCost_; |
---|
1512 | /// Sum of Dual infeasibilities using tolerance based on error in duals |
---|
1513 | double sumOfRelaxedDualInfeasibilities_; |
---|
1514 | /// Sum of Primal infeasibilities using tolerance based on error in primals |
---|
1515 | double sumOfRelaxedPrimalInfeasibilities_; |
---|
1516 | /// Acceptable pivot value just after factorization |
---|
1517 | double acceptablePivot_; |
---|
1518 | /// Working copy of lower bounds (Owner of arrays below) |
---|
1519 | double * lower_; |
---|
1520 | /// Row lower bounds - working copy |
---|
1521 | double * rowLowerWork_; |
---|
1522 | /// Column lower bounds - working copy |
---|
1523 | double * columnLowerWork_; |
---|
1524 | /// Working copy of upper bounds (Owner of arrays below) |
---|
1525 | double * upper_; |
---|
1526 | /// Row upper bounds - working copy |
---|
1527 | double * rowUpperWork_; |
---|
1528 | /// Column upper bounds - working copy |
---|
1529 | double * columnUpperWork_; |
---|
1530 | /// Working copy of objective (Owner of arrays below) |
---|
1531 | double * cost_; |
---|
1532 | /// Row objective - working copy |
---|
1533 | double * rowObjectiveWork_; |
---|
1534 | /// Column objective - working copy |
---|
1535 | double * objectiveWork_; |
---|
1536 | /// Useful row length arrays |
---|
1537 | CoinIndexedVector * rowArray_[6]; |
---|
1538 | /// Useful column length arrays |
---|
1539 | CoinIndexedVector * columnArray_[6]; |
---|
1540 | /// Sequence of In variable |
---|
1541 | int sequenceIn_; |
---|
1542 | /// Direction of In, 1 going up, -1 going down, 0 not a clude |
---|
1543 | int directionIn_; |
---|
1544 | /// Sequence of Out variable |
---|
1545 | int sequenceOut_; |
---|
1546 | /// Direction of Out, 1 to upper bound, -1 to lower bound, 0 - superbasic |
---|
1547 | int directionOut_; |
---|
1548 | /// Pivot Row |
---|
1549 | int pivotRow_; |
---|
1550 | /// Last good iteration (immediately after a re-factorization) |
---|
1551 | int lastGoodIteration_; |
---|
1552 | /// Working copy of reduced costs (Owner of arrays below) |
---|
1553 | double * dj_; |
---|
1554 | /// Reduced costs of slacks not same as duals (or - duals) |
---|
1555 | double * rowReducedCost_; |
---|
1556 | /// Possible scaled reduced costs |
---|
1557 | double * reducedCostWork_; |
---|
1558 | /// Working copy of primal solution (Owner of arrays below) |
---|
1559 | double * solution_; |
---|
1560 | /// Row activities - working copy |
---|
1561 | double * rowActivityWork_; |
---|
1562 | /// Column activities - working copy |
---|
1563 | double * columnActivityWork_; |
---|
1564 | /// Number of dual infeasibilities |
---|
1565 | int numberDualInfeasibilities_; |
---|
1566 | /// Number of dual infeasibilities (without free) |
---|
1567 | int numberDualInfeasibilitiesWithoutFree_; |
---|
1568 | /// Number of primal infeasibilities |
---|
1569 | int numberPrimalInfeasibilities_; |
---|
1570 | /// How many iterative refinements to do |
---|
1571 | int numberRefinements_; |
---|
1572 | /// dual row pivot choice |
---|
1573 | ClpDualRowPivot * dualRowPivot_; |
---|
1574 | /// primal column pivot choice |
---|
1575 | ClpPrimalColumnPivot * primalColumnPivot_; |
---|
1576 | /// Basic variables pivoting on which rows |
---|
1577 | int * pivotVariable_; |
---|
1578 | /// factorization |
---|
1579 | ClpFactorization * factorization_; |
---|
1580 | /// Saved version of solution |
---|
1581 | double * savedSolution_; |
---|
1582 | /// Number of times code has tentatively thought optimal |
---|
1583 | int numberTimesOptimal_; |
---|
1584 | /// Disaster handler |
---|
1585 | ClpDisasterHandler * disasterArea_; |
---|
1586 | /// If change has been made (first attempt at stopping looping) |
---|
1587 | int changeMade_; |
---|
1588 | /// Algorithm >0 == Primal, <0 == Dual |
---|
1589 | int algorithm_; |
---|
1590 | /** Now for some reliability aids |
---|
1591 | This forces re-factorization early */ |
---|
1592 | int forceFactorization_; |
---|
1593 | /** Perturbation: |
---|
1594 | -50 to +50 - perturb by this power of ten (-6 sounds good) |
---|
1595 | 100 - auto perturb if takes too long (1.0e-6 largest nonzero) |
---|
1596 | 101 - we are perturbed |
---|
1597 | 102 - don't try perturbing again |
---|
1598 | default is 100 |
---|
1599 | */ |
---|
1600 | int perturbation_; |
---|
1601 | /// Saved status regions |
---|
1602 | unsigned char * saveStatus_; |
---|
1603 | /** Very wasteful way of dealing with infeasibilities in primal. |
---|
1604 | However it will allow non-linearities and use of dual |
---|
1605 | analysis. If it doesn't work it can easily be replaced. |
---|
1606 | */ |
---|
1607 | ClpNonLinearCost * nonLinearCost_; |
---|
1608 | /// So we know when to be cautious |
---|
1609 | int lastBadIteration_; |
---|
1610 | /// So we know when to open up again |
---|
1611 | int lastFlaggedIteration_; |
---|
1612 | /// Can be used for count of fake bounds (dual) or fake costs (primal) |
---|
1613 | int numberFake_; |
---|
1614 | /// Can be used for count of changed costs (dual) or changed bounds (primal) |
---|
1615 | int numberChanged_; |
---|
1616 | /// Progress flag - at present 0 bit says artificials out, 1 free in |
---|
1617 | int progressFlag_; |
---|
1618 | /// First free/super-basic variable (-1 if none) |
---|
1619 | int firstFree_; |
---|
1620 | /** Number of extra rows. These are ones which will be dynamically created |
---|
1621 | each iteration. This is for GUB but may have other uses. |
---|
1622 | */ |
---|
1623 | int numberExtraRows_; |
---|
1624 | /** Maximum number of basic variables - can be more than number of rows if GUB |
---|
1625 | */ |
---|
1626 | int maximumBasic_; |
---|
1627 | /// If may skip final factorize then allow up to this pivots (default 20) |
---|
1628 | int dontFactorizePivots_; |
---|
1629 | /** For advanced use. When doing iterative solves things can get |
---|
1630 | nasty so on values pass if incoming solution has largest |
---|
1631 | infeasibility < incomingInfeasibility throw out variables |
---|
1632 | from basis until largest infeasibility < allowedInfeasibility. |
---|
1633 | if allowedInfeasibility>= incomingInfeasibility this is |
---|
1634 | always possible altough you may end up with an all slack basis. |
---|
1635 | |
---|
1636 | Defaults are 1.0,10.0 |
---|
1637 | */ |
---|
1638 | double incomingInfeasibility_; |
---|
1639 | double allowedInfeasibility_; |
---|
1640 | /// Automatic scaling of objective and rhs and bounds |
---|
1641 | int automaticScale_; |
---|
1642 | /// Maximum perturbation array size (take out when code rewritten) |
---|
1643 | int maximumPerturbationSize_; |
---|
1644 | /// Perturbation array (maximumPerturbationSize_) |
---|
1645 | double * perturbationArray_; |
---|
1646 | /// A copy of model with certain state - normally without cuts |
---|
1647 | ClpSimplex * baseModel_; |
---|
1648 | /// For dealing with all issues of cycling etc |
---|
1649 | ClpSimplexProgress progress_; |
---|
1650 | #ifdef ABC_INHERIT |
---|
1651 | AbcSimplex * abcSimplex_; |
---|
1652 | #define CLP_ABC_WANTED 1 |
---|
1653 | #define CLP_ABC_WANTED_PARALLEL 2 |
---|
1654 | #define CLP_ABC_FULL_DONE 8 |
---|
1655 | // bits 256,512,1024 for crash |
---|
1656 | #endif |
---|
1657 | #define CLP_ABC_BEEN_FEASIBLE 65536 |
---|
1658 | int abcState_; |
---|
1659 | public: |
---|
1660 | /// Spare int array for passing information [0]!=0 switches on |
---|
1661 | mutable int spareIntArray_[4]; |
---|
1662 | /// Spare double array for passing information [0]!=0 switches on |
---|
1663 | mutable double spareDoubleArray_[4]; |
---|
1664 | protected: |
---|
1665 | /// Allow OsiClp certain perks |
---|
1666 | friend class OsiClpSolverInterface; |
---|
1667 | //@} |
---|
1668 | }; |
---|
1669 | //############################################################################# |
---|
1670 | /** A function that tests the methods in the ClpSimplex class. The |
---|
1671 | only reason for it not to be a member method is that this way it doesn't |
---|
1672 | have to be compiled into the library. And that's a gain, because the |
---|
1673 | library should be compiled with optimization on, but this method should be |
---|
1674 | compiled with debugging. |
---|
1675 | |
---|
1676 | It also does some testing of ClpFactorization class |
---|
1677 | */ |
---|
1678 | void |
---|
1679 | ClpSimplexUnitTest(const std::string & mpsDir); |
---|
1680 | |
---|
1681 | // For Devex stuff |
---|
1682 | #define DEVEX_TRY_NORM 1.0e-4 |
---|
1683 | #define DEVEX_ADD_ONE 1.0 |
---|
1684 | #endif |
---|