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AbcDualRowPivot Class Referenceabstract

Dual Row Pivot Abstract Base Class. More...

#include <AbcDualRowPivot.hpp>

+ Inheritance diagram for AbcDualRowPivot:
+ Collaboration diagram for AbcDualRowPivot:

Public Member Functions

Algorithmic methods
virtual int pivotRow ()=0
 Returns pivot row, -1 if none. More...
 
virtual double updateWeights1 (CoinIndexedVector &input, CoinIndexedVector &updateColumn)=0
 Does most of work for weights and returns pivot alpha. More...
 
virtual void updateWeightsOnly (CoinIndexedVector &input)=0
 
virtual double updateWeights (CoinIndexedVector &input, CoinIndexedVector &updateColumn)=0
 
virtual void updateWeights2 (CoinIndexedVector &input, CoinIndexedVector &updateColumn)=0
 Actually updates weights. More...
 
virtual void updatePrimalSolution (CoinIndexedVector &updateColumn, double theta)=0
 Updates primal solution (and maybe list of candidates) Uses input vector which it deletes Would be faster if we kept basic regions, but on other hand it means everything is always in sync. More...
 
virtual void updatePrimalSolutionAndWeights (CoinIndexedVector &weightsVector, CoinIndexedVector &updateColumn, double theta)
 
virtual void saveWeights (AbcSimplex *model, int mode)
 Saves any weights round factorization as pivot rows may change Will be empty unless steepest edge (will save model) May also recompute infeasibility stuff 1) before factorization 2) after good factorization (if weights empty may initialize) 3) after something happened but no factorization (e.g. More...
 
virtual void recomputeInfeasibilities ()
 Recompute infeasibilities. More...
 
virtual void checkAccuracy ()
 checks accuracy and may re-initialize (may be empty) More...
 
virtual void clearArrays ()
 Gets rid of all arrays (may be empty) More...
 
virtual bool looksOptimal () const
 Returns true if would not find any row. More...
 
Constructors and destructors
 AbcDualRowPivot ()
 Default Constructor. More...
 
 AbcDualRowPivot (const AbcDualRowPivot &)
 Copy constructor. More...
 
AbcDualRowPivotoperator= (const AbcDualRowPivot &rhs)
 Assignment operator. More...
 
virtual ~AbcDualRowPivot ()
 Destructor. More...
 
virtual AbcDualRowPivotclone (bool copyData=true) const =0
 Clone. More...
 
Other
AbcSimplexmodel ()
 Returns model. More...
 
void setModel (AbcSimplex *newmodel)
 Sets model (normally to NULL) More...
 
int type ()
 Returns type (above 63 is extra information) More...
 

Protected Attributes

Protected member data
AbcSimplexmodel_
 Pointer to model. More...
 
int type_
 Type of row pivot algorithm. More...
 

Detailed Description

Dual Row Pivot Abstract Base Class.

Abstract Base Class for describing an interface to an algorithm to choose row pivot in dual simplex algorithm. For some algorithms e.g. Dantzig choice then some functions may be null.

Definition at line 23 of file AbcDualRowPivot.hpp.

Constructor & Destructor Documentation

AbcDualRowPivot::AbcDualRowPivot ( )

Default Constructor.

AbcDualRowPivot::AbcDualRowPivot ( const AbcDualRowPivot )

Copy constructor.

virtual AbcDualRowPivot::~AbcDualRowPivot ( )
virtual

Destructor.

Member Function Documentation

virtual int AbcDualRowPivot::pivotRow ( )
pure virtual

Returns pivot row, -1 if none.

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual double AbcDualRowPivot::updateWeights1 ( CoinIndexedVector input,
CoinIndexedVector updateColumn 
)
pure virtual

Does most of work for weights and returns pivot alpha.

Also does FT update

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual void AbcDualRowPivot::updateWeightsOnly ( CoinIndexedVector input)
pure virtual

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual double AbcDualRowPivot::updateWeights ( CoinIndexedVector input,
CoinIndexedVector updateColumn 
)
pure virtual

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual void AbcDualRowPivot::updateWeights2 ( CoinIndexedVector input,
CoinIndexedVector updateColumn 
)
pure virtual

Actually updates weights.

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual void AbcDualRowPivot::updatePrimalSolution ( CoinIndexedVector updateColumn,
double  theta 
)
pure virtual

Updates primal solution (and maybe list of candidates) Uses input vector which it deletes Would be faster if we kept basic regions, but on other hand it means everything is always in sync.

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual void AbcDualRowPivot::updatePrimalSolutionAndWeights ( CoinIndexedVector weightsVector,
CoinIndexedVector updateColumn,
double  theta 
)
virtual

Reimplemented in AbcDualRowSteepest.

virtual void AbcDualRowPivot::saveWeights ( AbcSimplex model,
int  mode 
)
virtual

Saves any weights round factorization as pivot rows may change Will be empty unless steepest edge (will save model) May also recompute infeasibility stuff 1) before factorization 2) after good factorization (if weights empty may initialize) 3) after something happened but no factorization (e.g.

check for infeasible) 4) as 2 but restore weights from previous snapshot 5) for strong branching - initialize , infeasibilities

Reimplemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual void AbcDualRowPivot::recomputeInfeasibilities ( )
virtual

Recompute infeasibilities.

Reimplemented in AbcDualRowSteepest, and AbcDualRowDantzig.

virtual void AbcDualRowPivot::checkAccuracy ( )
virtual

checks accuracy and may re-initialize (may be empty)

virtual void AbcDualRowPivot::clearArrays ( )
virtual

Gets rid of all arrays (may be empty)

Reimplemented in AbcDualRowSteepest.

virtual bool AbcDualRowPivot::looksOptimal ( ) const
inlinevirtual

Returns true if would not find any row.

Reimplemented in AbcDualRowSteepest.

Definition at line 69 of file AbcDualRowPivot.hpp.

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

Assignment operator.

virtual AbcDualRowPivot* AbcDualRowPivot::clone ( bool  copyData = true) const
pure virtual

Clone.

Implemented in AbcDualRowSteepest, and AbcDualRowDantzig.

AbcSimplex* AbcDualRowPivot::model ( )
inline

Returns model.

Definition at line 97 of file AbcDualRowPivot.hpp.

void AbcDualRowPivot::setModel ( AbcSimplex newmodel)
inline

Sets model (normally to NULL)

Definition at line 102 of file AbcDualRowPivot.hpp.

int AbcDualRowPivot::type ( )
inline

Returns type (above 63 is extra information)

Definition at line 107 of file AbcDualRowPivot.hpp.

Member Data Documentation

AbcSimplex* AbcDualRowPivot::model_
protected

Pointer to model.

Definition at line 119 of file AbcDualRowPivot.hpp.

int AbcDualRowPivot::type_
protected

Type of row pivot algorithm.

Definition at line 121 of file AbcDualRowPivot.hpp.


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