Cbc
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Greedy heuristic for SOS and L rows (and positive elements) More...
#include <CbcHeuristicGreedy.hpp>
Public Member Functions | |
CbcHeuristicGreedySOS () | |
CbcHeuristicGreedySOS (CbcModel &model) | |
CbcHeuristicGreedySOS (const CbcHeuristicGreedySOS &) | |
~CbcHeuristicGreedySOS () | |
virtual CbcHeuristic * | clone () const |
Clone. | |
CbcHeuristicGreedySOS & | operator= (const CbcHeuristicGreedySOS &rhs) |
Assignment operator. | |
virtual void | generateCpp (FILE *fp) |
Create C++ lines to get to current state. | |
virtual void | setModel (CbcModel *model) |
update model (This is needed if cliques update matrix etc) | |
virtual int | solution (double &objectiveValue, double *newSolution) |
returns 0 if no solution, 1 if valid solution. | |
virtual void | validate () |
Validate model i.e. sets when_ to 0 if necessary (may be NULL) | |
virtual void | resetModel (CbcModel *model) |
Resets stuff if model changes. | |
int | algorithm () const |
void | setAlgorithm (int value) |
int | numberTimes () const |
void | setNumberTimes (int value) |
Protected Member Functions | |
void | gutsOfConstructor (CbcModel *model) |
Guts of constructor from a CbcModel. | |
Protected Attributes | |
double * | originalRhs_ |
CoinPackedMatrix | matrix_ |
int | originalNumberRows_ |
int | algorithm_ |
int | numberTimes_ |
Do this many times. |
Greedy heuristic for SOS and L rows (and positive elements)
Definition at line 193 of file CbcHeuristicGreedy.hpp.
virtual CbcHeuristic* CbcHeuristicGreedySOS::clone | ( | ) | const [virtual] |
Clone.
Implements CbcHeuristic.
CbcHeuristicGreedySOS& CbcHeuristicGreedySOS::operator= | ( | const CbcHeuristicGreedySOS & | rhs | ) |
Assignment operator.
virtual void CbcHeuristicGreedySOS::generateCpp | ( | FILE * | fp | ) | [virtual] |
Create C++ lines to get to current state.
Reimplemented from CbcHeuristic.
virtual void CbcHeuristicGreedySOS::setModel | ( | CbcModel * | model | ) | [virtual] |
update model (This is needed if cliques update matrix etc)
Reimplemented from CbcHeuristic.
virtual int CbcHeuristicGreedySOS::solution | ( | double & | objectiveValue, |
double * | newSolution | ||
) | [virtual] |
returns 0 if no solution, 1 if valid solution.
Sets solution values if good, sets objective value (only if good) We leave all variables which are at one at this node of the tree to that value and will initially set all others to zero. We then sort all variables in order of their cost divided by the number of entries in rows which are not yet covered. We randomize that value a bit so that ties will be broken in different ways on different runs of the heuristic. We then choose the best one and set it to one and repeat the exercise.
Implements CbcHeuristic.
virtual void CbcHeuristicGreedySOS::validate | ( | ) | [virtual] |
Validate model i.e. sets when_ to 0 if necessary (may be NULL)
Reimplemented from CbcHeuristic.
virtual void CbcHeuristicGreedySOS::resetModel | ( | CbcModel * | model | ) | [virtual] |
Resets stuff if model changes.
Implements CbcHeuristic.
int CbcHeuristicGreedySOS::algorithm | ( | ) | const [inline] |
Definition at line 245 of file CbcHeuristicGreedy.hpp.
void CbcHeuristicGreedySOS::setAlgorithm | ( | int | value | ) | [inline] |
Definition at line 248 of file CbcHeuristicGreedy.hpp.
int CbcHeuristicGreedySOS::numberTimes | ( | ) | const [inline] |
Definition at line 252 of file CbcHeuristicGreedy.hpp.
void CbcHeuristicGreedySOS::setNumberTimes | ( | int | value | ) | [inline] |
Definition at line 255 of file CbcHeuristicGreedy.hpp.
void CbcHeuristicGreedySOS::gutsOfConstructor | ( | CbcModel * | model | ) | [protected] |
Guts of constructor from a CbcModel.
double* CbcHeuristicGreedySOS::originalRhs_ [protected] |
Definition at line 265 of file CbcHeuristicGreedy.hpp.
CoinPackedMatrix CbcHeuristicGreedySOS::matrix_ [protected] |
Definition at line 267 of file CbcHeuristicGreedy.hpp.
int CbcHeuristicGreedySOS::originalNumberRows_ [protected] |
Definition at line 269 of file CbcHeuristicGreedy.hpp.
int CbcHeuristicGreedySOS::algorithm_ [protected] |
Definition at line 272 of file CbcHeuristicGreedy.hpp.
int CbcHeuristicGreedySOS::numberTimes_ [protected] |
Do this many times.
Definition at line 274 of file CbcHeuristicGreedy.hpp.