twoxtwo_action Class Reference

Detect interesting 2 by 2 blocks. More...

#include <CoinPresolveDupcol.hpp>

Inheritance diagram for twoxtwo_action:

Collaboration diagram for twoxtwo_action:

Classes
struct	action

Public Member Functions
const char *	name () const
	A name for debug printing. More...
void	postsolve (CoinPostsolveMatrix *prob) const
	Apply the postsolve transformation for this particular presolve action. More...
	~twoxtwo_action ()
Public Member Functions inherited from CoinPresolveAction
	CoinPresolveAction (const CoinPresolveAction *next)
	Construct a postsolve object and add it to the transformation list. More...
void	setNext (const CoinPresolveAction *nextAction)
	modify next (when building rather than passing) More...
virtual	~CoinPresolveAction ()
	Virtual destructor. More...

Static Public Member Functions
static const CoinPresolveAction *	presolve (CoinPresolveMatrix *prob, const CoinPresolveAction *next)
Static Public Member Functions inherited from CoinPresolveAction
static void	throwCoinError (const char *error, const char *ps_routine)
	Stub routine to throw exceptions. More...

Private Member Functions
	twoxtwo_action ()
	twoxtwo_action (int nactions, const action *actions, const CoinPresolveAction *next)

Private Attributes
const int	nactions_
const action *const	actions_

Additional Inherited Members
Public Attributes inherited from CoinPresolveAction
const CoinPresolveAction *	next
	The next presolve transformation. More...

Detailed Description

Detect interesting 2 by 2 blocks.

If a variable has two entries and for each row there are only two entries with same other variable then we can get rid of one constraint and modify costs.

This is a work in progress - I need more examples

Definition at line 191 of file CoinPresolveDupcol.hpp.

Constructor & Destructor Documentation

twoxtwo_action::twoxtwo_action ( )

inlineprivate

Definition at line 207 of file CoinPresolveDupcol.hpp.

twoxtwo_action::twoxtwo_action ( int  nactions, const action *  actions, const CoinPresolveAction *  next  )

inlineprivate

Definition at line 208 of file CoinPresolveDupcol.hpp.

twoxtwo_action::~twoxtwo_action ( )

inline

Definition at line 222 of file CoinPresolveDupcol.hpp.

Member Function Documentation

const char* twoxtwo_action::name ( ) const

virtual

A name for debug printing.

It is expected that the name is not stored in the transform itself.

Implements CoinPresolveAction.

static const CoinPresolveAction* twoxtwo_action::presolve ( CoinPresolveMatrix *  prob, const CoinPresolveAction *  next  )

static

void twoxtwo_action::postsolve ( CoinPostsolveMatrix *  prob ) const

virtual

Apply the postsolve transformation for this particular presolve action.

Implements CoinPresolveAction.

Member Data Documentation

const int twoxtwo_action::nactions_

private

Definition at line 204 of file CoinPresolveDupcol.hpp.

const action* const twoxtwo_action::actions_

private

Definition at line 205 of file CoinPresolveDupcol.hpp.

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

• /home/coin/svn-release/Blis-0.94.3/CoinUtils/src/CoinPresolveDupcol.hpp