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OsiBabSolver Class Reference

This class allows for the use of more exotic solvers e.g. More...

#include <OsiAuxInfo.hpp>

+ Inheritance diagram for OsiBabSolver:
+ Collaboration diagram for OsiBabSolver:

Public Member Functions

 OsiBabSolver (int solverType=0)
 
 OsiBabSolver (const OsiBabSolver &rhs)
 
virtual ~OsiBabSolver ()
 
virtual OsiAuxInfoclone () const
 Clone. More...
 
OsiBabSolveroperator= (const OsiBabSolver &rhs)
 Assignment operator. More...
 
void setSolver (const OsiSolverInterface *solver)
 Update solver. More...
 
void setSolver (const OsiSolverInterface &solver)
 Update solver. More...
 
int solution (double &objectiveValue, double *newSolution, int numberColumns)
 returns 0 if no heuristic solution, 1 if valid solution with better objective value than one passed in Sets solution values if good, sets objective value numberColumns is size of newSolution More...
 
void setSolution (const double *solution, int numberColumns, double objectiveValue)
 Set solution and objective value. More...
 
bool hasSolution (double &solutionValue, double *solution)
 returns true if the object stores a solution, false otherwise. More...
 
void setSolverType (int value)
 Sets solver type 0 - normal LP solver 1 - DW - may also return heuristic solutions 2 - NLP solver or similar - can't compute objective value just from solution check solver to see if feasible and what objective value is. More...
 
int solverType () const
 gets solver type 0 - normal LP solver 1 - DW - may also return heuristic solutions 2 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is More...
 
bool solutionAddsCuts () const
 Return true if getting solution may add cuts so hot start etc will be obsolete. More...
 
bool alwaysTryCutsAtRootNode () const
 Return true if we should try cuts at root even if looks satisfied. More...
 
bool solverAccurate () const
 Returns true if can use solver objective or feasible values, otherwise use mipBound etc. More...
 
bool reducedCostsAccurate () const
 Returns true if can use reduced costs for fixing. More...
 
double mipBound () const
 Get objective (well mip bound) More...
 
bool mipFeasible () const
 Returns true if node feasible. More...
 
void setMipBound (double value)
 Set mip bound (only used for some solvers) More...
 
double bestObjectiveValue () const
 Get objective value of saved solution. More...
 
bool tryCuts () const
 Says whether we want to try cuts at all. More...
 
bool warmStart () const
 Says whether we have a warm start (so can do strong branching) More...
 
int extraCharacteristics () const
 Get bit mask for odd actions of solvers 1 - solution or bound arrays may move in mysterious ways e.g. More...
 
void setExtraCharacteristics (int value)
 Set bit mask for odd actions of solvers 1 - solution or bound arrays may move in mysterious ways e.g. More...
 
const double * beforeLower () const
 Pointer to lower bounds before branch (only if extraCharacteristics set) More...
 
void setBeforeLower (const double *array)
 Set pointer to lower bounds before branch (only if extraCharacteristics set) More...
 
const double * beforeUpper () const
 Pointer to upper bounds before branch (only if extraCharacteristics set) More...
 
void setBeforeUpper (const double *array)
 Set pointer to upper bounds before branch (only if extraCharacteristics set) More...
 
- Public Member Functions inherited from OsiAuxInfo
 OsiAuxInfo (void *appData=NULL)
 
 OsiAuxInfo (const OsiAuxInfo &rhs)
 
virtual ~OsiAuxInfo ()
 
OsiAuxInfooperator= (const OsiAuxInfo &rhs)
 Assignment operator. More...
 
voidgetApplicationData () const
 Get application data. More...
 

Protected Attributes

double bestObjectiveValue_
 Objective value of best solution (if there is one) (minimization) More...
 
double mipBound_
 Current lower bound on solution ( if > 1.0e50 infeasible) More...
 
const OsiSolverInterfacesolver_
 Solver to use for getting/setting solutions etc. More...
 
double * bestSolution_
 Best integer feasible solution. More...
 
const double * beforeLower_
 Pointer to lower bounds before branch (only if extraCharacteristics set) More...
 
const double * beforeUpper_
 Pointer to upper bounds before branch (only if extraCharacteristics set) More...
 
int solverType_
 Solver type 0 - normal LP solver 1 - DW - may also return heuristic solutions 2 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is. More...
 
int sizeSolution_
 Size of solution. More...
 
int extraCharacteristics_
 Bit mask for odd actions of solvers 1 - solution or bound arrays may move in mysterious ways e.g. More...
 
- Protected Attributes inherited from OsiAuxInfo
voidappData_
 Pointer to user-defined data structure. More...
 

Detailed Description

This class allows for the use of more exotic solvers e.g.

Non-Linear or Volume.

You can derive from this although at present I can't see the need.

Definition at line 49 of file OsiAuxInfo.hpp.

Constructor & Destructor Documentation

OsiBabSolver::OsiBabSolver ( int  solverType = 0)
OsiBabSolver::OsiBabSolver ( const OsiBabSolver rhs)
virtual OsiBabSolver::~OsiBabSolver ( )
virtual

Member Function Documentation

virtual OsiAuxInfo* OsiBabSolver::clone ( ) const
virtual

Clone.

Reimplemented from OsiAuxInfo.

OsiBabSolver& OsiBabSolver::operator= ( const OsiBabSolver rhs)

Assignment operator.

void OsiBabSolver::setSolver ( const OsiSolverInterface solver)
inline

Update solver.

Definition at line 65 of file OsiAuxInfo.hpp.

void OsiBabSolver::setSolver ( const OsiSolverInterface solver)
inline

Update solver.

Definition at line 68 of file OsiAuxInfo.hpp.

int OsiBabSolver::solution ( double &  objectiveValue,
double *  newSolution,
int  numberColumns 
)

returns 0 if no heuristic solution, 1 if valid solution with better objective value than one passed in Sets solution values if good, sets objective value numberColumns is size of newSolution

void OsiBabSolver::setSolution ( const double *  solution,
int  numberColumns,
double  objectiveValue 
)

Set solution and objective value.

Number of columns and optimization direction taken from current solver. Size of solution is numberColumns (may be padded or truncated in function)

bool OsiBabSolver::hasSolution ( double &  solutionValue,
double *  solution 
)

returns true if the object stores a solution, false otherwise.

If there is a solution then solutionValue and solution will be filled out as well. In that case the user needs to allocate solution to be a big enough array.

void OsiBabSolver::setSolverType ( int  value)
inline

Sets solver type 0 - normal LP solver 1 - DW - may also return heuristic solutions 2 - NLP solver or similar - can't compute objective value just from solution check solver to see if feasible and what objective value is.

- may also return heuristic solution

3 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is. Using Outer Approximation so called lp based

  • may also return heuristic solution 4 - normal solver but cuts are needed for integral solution

Definition at line 102 of file OsiAuxInfo.hpp.

int OsiBabSolver::solverType ( ) const
inline

gets solver type 0 - normal LP solver 1 - DW - may also return heuristic solutions 2 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is

- may also return heuristic solution

3 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is. Using Outer Approximation so called lp based

  • may also return heuristic solution 4 - normal solver but cuts are needed for integral solution

Definition at line 116 of file OsiAuxInfo.hpp.

bool OsiBabSolver::solutionAddsCuts ( ) const
inline

Return true if getting solution may add cuts so hot start etc will be obsolete.

Definition at line 120 of file OsiAuxInfo.hpp.

bool OsiBabSolver::alwaysTryCutsAtRootNode ( ) const
inline

Return true if we should try cuts at root even if looks satisfied.

Definition at line 123 of file OsiAuxInfo.hpp.

bool OsiBabSolver::solverAccurate ( ) const
inline

Returns true if can use solver objective or feasible values, otherwise use mipBound etc.

Definition at line 127 of file OsiAuxInfo.hpp.

bool OsiBabSolver::reducedCostsAccurate ( ) const
inline

Returns true if can use reduced costs for fixing.

Definition at line 130 of file OsiAuxInfo.hpp.

double OsiBabSolver::mipBound ( ) const

Get objective (well mip bound)

bool OsiBabSolver::mipFeasible ( ) const

Returns true if node feasible.

void OsiBabSolver::setMipBound ( double  value)
inline

Set mip bound (only used for some solvers)

Definition at line 137 of file OsiAuxInfo.hpp.

double OsiBabSolver::bestObjectiveValue ( ) const
inline

Get objective value of saved solution.

Definition at line 140 of file OsiAuxInfo.hpp.

bool OsiBabSolver::tryCuts ( ) const
inline

Says whether we want to try cuts at all.

Definition at line 143 of file OsiAuxInfo.hpp.

bool OsiBabSolver::warmStart ( ) const
inline

Says whether we have a warm start (so can do strong branching)

Definition at line 146 of file OsiAuxInfo.hpp.

int OsiBabSolver::extraCharacteristics ( ) const
inline

Get bit mask for odd actions of solvers 1 - solution or bound arrays may move in mysterious ways e.g.

cplex 2 - solver may want bounds before branch

Definition at line 152 of file OsiAuxInfo.hpp.

void OsiBabSolver::setExtraCharacteristics ( int  value)
inline

Set bit mask for odd actions of solvers 1 - solution or bound arrays may move in mysterious ways e.g.

cplex 2 - solver may want bounds before branch

Definition at line 158 of file OsiAuxInfo.hpp.

const double* OsiBabSolver::beforeLower ( ) const
inline

Pointer to lower bounds before branch (only if extraCharacteristics set)

Definition at line 161 of file OsiAuxInfo.hpp.

void OsiBabSolver::setBeforeLower ( const double *  array)
inline

Set pointer to lower bounds before branch (only if extraCharacteristics set)

Definition at line 164 of file OsiAuxInfo.hpp.

const double* OsiBabSolver::beforeUpper ( ) const
inline

Pointer to upper bounds before branch (only if extraCharacteristics set)

Definition at line 167 of file OsiAuxInfo.hpp.

void OsiBabSolver::setBeforeUpper ( const double *  array)
inline

Set pointer to upper bounds before branch (only if extraCharacteristics set)

Definition at line 170 of file OsiAuxInfo.hpp.

Member Data Documentation

double OsiBabSolver::bestObjectiveValue_
protected

Objective value of best solution (if there is one) (minimization)

Definition at line 174 of file OsiAuxInfo.hpp.

double OsiBabSolver::mipBound_
protected

Current lower bound on solution ( if > 1.0e50 infeasible)

Definition at line 176 of file OsiAuxInfo.hpp.

const OsiSolverInterface* OsiBabSolver::solver_
protected

Solver to use for getting/setting solutions etc.

Definition at line 178 of file OsiAuxInfo.hpp.

double* OsiBabSolver::bestSolution_
protected

Best integer feasible solution.

Definition at line 180 of file OsiAuxInfo.hpp.

const double* OsiBabSolver::beforeLower_
protected

Pointer to lower bounds before branch (only if extraCharacteristics set)

Definition at line 182 of file OsiAuxInfo.hpp.

const double* OsiBabSolver::beforeUpper_
protected

Pointer to upper bounds before branch (only if extraCharacteristics set)

Definition at line 184 of file OsiAuxInfo.hpp.

int OsiBabSolver::solverType_
protected

Solver type 0 - normal LP solver 1 - DW - may also return heuristic solutions 2 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is.

- may also return heuristic solution

3 - NLP solver or similar - can't compute objective value just from solution check this (rather than solver) to see if feasible and what objective value is. Using Outer Approximation so called lp based

  • may also return heuristic solution

Definition at line 196 of file OsiAuxInfo.hpp.

int OsiBabSolver::sizeSolution_
protected

Size of solution.

Definition at line 198 of file OsiAuxInfo.hpp.

int OsiBabSolver::extraCharacteristics_
protected

Bit mask for odd actions of solvers 1 - solution or bound arrays may move in mysterious ways e.g.

cplex 2 - solver may want bounds before branch

Definition at line 203 of file OsiAuxInfo.hpp.


The documentation for this class was generated from the following file: