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
	Construct a postsolve object and add it to the transformation list.
void	postsolve (CoinPostsolveMatrix *prob) const
	Apply the postsolve transformation for this particular presolve action.
	~twoxtwo_action ()
Public Member Functions inherited from CoinPresolveAction
virtual	~CoinPresolveAction ()
	Virtual destructor.

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.

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.

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 214 of file CoinPresolveDupcol.hpp.

Constructor & Destructor Documentation

twoxtwo_action() [1/2]

twoxtwo_action::twoxtwo_action ( )

inlineprivate

Definition at line 230 of file CoinPresolveDupcol.hpp.

twoxtwo_action() [2/2]

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

inlineprivate

Definition at line 236 of file CoinPresolveDupcol.hpp.

~twoxtwo_action()

twoxtwo_action::~twoxtwo_action ( )

inline

Definition at line 253 of file CoinPresolveDupcol.hpp.

Member Function Documentation

name()

const char * twoxtwo_action::name ( ) const

virtual

Construct a postsolve object and add it to the transformation list.

This is an `add to head' operation. This object will point to the one passed as the parameter. */ CoinPresolveAction(const CoinPresolveAction *next) : next(next) { } modify next (when building rather than passing) inline void setNext(const CoinPresolveAction *nextAction) { next = nextAction; }

/*! A name for debug printing.

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

Implements CoinPresolveAction.

presolve()

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

static

postsolve()

void twoxtwo_action::postsolve ( CoinPostsolveMatrix * prob ) const

virtual

Apply the postsolve transformation for this particular presolve action.

Implements CoinPresolveAction.

Member Data Documentation

nactions_

const int twoxtwo_action::nactions_

private

Definition at line 227 of file CoinPresolveDupcol.hpp.

actions_

const action* const twoxtwo_action::actions_

private

Definition at line 228 of file CoinPresolveDupcol.hpp.

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

• /builddir/build/BUILD/coin-or-CoinUtils-2.11.12-build/CoinUtils-releases-2.11.12/CoinUtils/src/CoinPresolveDupcol.hpp