Changeset 844 for stable/2.0/Cbc/src/CbcHeuristic.cpp
 Timestamp:
 Dec 20, 2007 7:20:12 AM (12 years ago)
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stable/2.0/Cbc/src/CbcHeuristic.cpp
r776 r844 998 998 999 999 // Default Constructor 1000 CbcHeuristicPartial::CbcHeuristicPartial() 1001 :CbcHeuristic() 1002 { 1003 fixPriority_ = 10000; 1004 } 1005 1006 // Constructor from model 1007 CbcHeuristicPartial::CbcHeuristicPartial(CbcModel & model, int fixPriority, int numberNodes) 1008 :CbcHeuristic(model) 1009 { 1010 fixPriority_ = fixPriority; 1011 setNumberNodes(numberNodes); 1012 validate(); 1013 } 1014 1015 // Destructor 1016 CbcHeuristicPartial::~CbcHeuristicPartial () 1017 { 1018 } 1019 1020 // Clone 1021 CbcHeuristic * 1022 CbcHeuristicPartial::clone() const 1023 { 1024 return new CbcHeuristicPartial(*this); 1025 } 1026 // Create C++ lines to get to current state 1027 void 1028 CbcHeuristicPartial::generateCpp( FILE * fp) 1029 { 1030 CbcHeuristicPartial other; 1031 fprintf(fp,"0#include \"CbcHeuristic.hpp\"\n"); 1032 fprintf(fp,"3 CbcHeuristicPartial partial(*cbcModel);\n"); 1033 CbcHeuristic::generateCpp(fp,"partial"); 1034 if (fixPriority_!=other.fixPriority_) 1035 fprintf(fp,"3 partial.setFixPriority(%d);\n",fixPriority_); 1036 else 1037 fprintf(fp,"4 partial.setFixPriority(%d);\n",fixPriority_); 1038 fprintf(fp,"3 cbcModel>addHeuristic(&partial);\n"); 1039 } 1040 //#define NEW_PARTIAL 1041 // Copy constructor 1042 CbcHeuristicPartial::CbcHeuristicPartial(const CbcHeuristicPartial & rhs) 1043 : 1044 CbcHeuristic(rhs), 1045 fixPriority_(rhs.fixPriority_) 1046 { 1047 } 1048 1049 // Assignment operator 1050 CbcHeuristicPartial & 1051 CbcHeuristicPartial::operator=( const CbcHeuristicPartial& rhs) 1052 { 1053 if (this!=&rhs) { 1054 CbcHeuristic::operator=(rhs); 1055 fixPriority_ = rhs.fixPriority_; 1056 } 1057 return *this; 1058 } 1059 1060 // Resets stuff if model changes 1061 void 1062 CbcHeuristicPartial::resetModel(CbcModel * model) 1063 { 1064 model_=model; 1065 // Get a copy of original matrix (and by row for partial); 1066 assert(model_>solver()); 1067 validate(); 1068 } 1069 // See if partial will give solution 1070 // Sets value of solution 1071 // Assumes rhs for original matrix still okay 1072 // At present only works with integers 1073 // Fix values if asked for 1074 // Returns 1 if solution, 0 if not 1075 int 1076 CbcHeuristicPartial::solution(double & solutionValue, 1077 double * betterSolution) 1078 { 1079 // Return if already done 1080 if (fixPriority_<0) 1081 return 0; // switched off 1082 const double * hotstartSolution = model_>hotstartSolution(); 1083 const int * hotstartPriorities = model_>hotstartPriorities(); 1084 if (!hotstartSolution) 1085 return 0; 1086 OsiSolverInterface * solver = model_>solver(); 1087 1088 int numberIntegers = model_>numberIntegers(); 1089 const int * integerVariable = model_>integerVariable(); 1090 1091 OsiSolverInterface * newSolver = model_>continuousSolver()>clone(); 1092 const double * colLower = newSolver>getColLower(); 1093 const double * colUpper = newSolver>getColUpper(); 1094 1095 double primalTolerance; 1096 solver>getDblParam(OsiPrimalTolerance,primalTolerance); 1097 1098 int i; 1099 int numberFixed=0; 1100 int returnCode=0; 1101 1102 for (i=0;i<numberIntegers;i++) { 1103 int iColumn=integerVariable[i]; 1104 if (abs(hotstartPriorities[iColumn])<=fixPriority_) { 1105 double value = hotstartSolution[iColumn]; 1106 double lower = colLower[iColumn]; 1107 double upper = colUpper[iColumn]; 1108 value = CoinMax(value,lower); 1109 value = CoinMin(value,upper); 1110 if (fabs(valuefloor(value+0.5))<1.0e8) { 1111 value = floor(value+0.5); 1112 newSolver>setColLower(iColumn,value); 1113 newSolver>setColUpper(iColumn,value); 1114 numberFixed++; 1115 } 1116 } 1117 } 1118 if (numberFixed>numberIntegers/5100000000) { 1119 #ifdef COIN_DEVELOP 1120 printf("%d integers fixed\n",numberFixed); 1121 #endif 1122 returnCode = smallBranchAndBound(newSolver,numberNodes_,betterSolution,solutionValue, 1123 model_>getCutoff(),"CbcHeuristicPartial"); 1124 if (returnCode<0) 1125 returnCode=0; // returned on size 1126 //printf("return code %d",returnCode); 1127 if ((returnCode&2)!=0) { 1128 // could add cut 1129 returnCode &= ~2; 1130 //printf("could add cut with %d elements (if all 01)\n",nFix); 1131 } else { 1132 //printf("\n"); 1133 } 1134 } 1135 fixPriority_=1; // switch off 1136 delete newSolver; 1137 return returnCode; 1138 } 1139 // update model 1140 void CbcHeuristicPartial::setModel(CbcModel * model) 1141 { 1142 model_ = model; 1143 assert(model_>solver()); 1144 // make sure model okay for heuristic 1145 validate(); 1146 } 1147 // Validate model i.e. sets when_ to 0 if necessary (may be NULL) 1148 void 1149 CbcHeuristicPartial::validate() 1150 { 1151 if (model_&&when()<10) { 1152 if (model_>numberIntegers()!= 1153 model_>numberObjects()) 1154 setWhen(0); 1155 } 1156 } 1157 1158 // Default Constructor 1000 1159 CbcSerendipity::CbcSerendipity() 1001 1160 :CbcHeuristic()
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