AbcSimplexFactorization Class Reference

This just implements AbcFactorization when an AbcMatrix object is passed. More...

#include <AbcSimplexFactorization.hpp>

List of all members.

Public Member Functions
factorization
int	factorize (AbcSimplex *model, int solveType, bool valuesPass)
	When part of LP - given by basic variables.
Constructors, destructor
	AbcSimplexFactorization (int numberRows=0)
	Default constructor.
	~AbcSimplexFactorization ()
	Destructor.
Copy method
	AbcSimplexFactorization (const AbcSimplexFactorization &, int denseIfSmaller=0)
	The copy constructor.
AbcSimplexFactorization &	operator= (const AbcSimplexFactorization &)
void	setFactorization (AbcSimplexFactorization &rhs)
	Sets factorization.
rank one updates which do exist
double	checkReplacePart1 (CoinIndexedVector *regionSparse, int pivotRow)
	Checks if can replace one Column to basis, returns update alpha Fills in region for use later partial update already in U.
double	checkReplacePart1 (CoinIndexedVector *regionSparse, CoinIndexedVector *partialUpdate, int pivotRow)
	Checks if can replace one Column to basis, returns update alpha Fills in region for use later partial update in vector.
void	checkReplacePart1a (CoinIndexedVector *regionSparse, int pivotRow)
	Checks if can replace one Column to basis, returns update alpha Fills in region for use later partial update already in U.
double	checkReplacePart1b (CoinIndexedVector *regionSparse, int pivotRow)
int	checkReplacePart2 (int pivotRow, double btranAlpha, double ftranAlpha, double ftAlpha)
	Checks if can replace one Column to basis, returns 0=OK, 1=Probably OK, 2=singular, 3=no room, 5 max pivots.
void	replaceColumnPart3 (const AbcSimplex *model, CoinIndexedVector *regionSparse, CoinIndexedVector *tableauColumn, int pivotRow, double alpha)
	Replaces one Column to basis, partial update already in U.
void	replaceColumnPart3 (const AbcSimplex *model, CoinIndexedVector *regionSparse, CoinIndexedVector *tableauColumn, CoinIndexedVector *partialUpdate, int pivotRow, double alpha)
	Replaces one Column to basis, partial update in vector.
various uses of factorization (return code number elements)
which user may want to know about
int	updateColumnFT (CoinIndexedVector &regionSparseFT)
	Updates one column (FTRAN) Tries to do FT update number returned is negative if no room.
int	updateColumnFTPart1 (CoinIndexedVector &regionSparseFT)
void	updateColumnFTPart2 (CoinIndexedVector &regionSparseFT)
void	updateColumnFT (CoinIndexedVector &regionSparseFT, CoinIndexedVector &partialUpdate, int which)
	Updates one column (FTRAN) Tries to do FT update puts partial update in vector.
int	updateColumn (CoinIndexedVector &regionSparse) const
	Updates one column (FTRAN)
int	updateTwoColumnsFT (CoinIndexedVector &regionSparseFT, CoinIndexedVector &regionSparseOther)
	Updates one column (FTRAN) from regionFT Tries to do FT update number returned is negative if no room.
int	updateColumnTranspose (CoinIndexedVector &regionSparse) const
	Updates one column (BTRAN)
void	updateColumnCpu (CoinIndexedVector &regionSparse, int whichCpu) const
	Updates one column (FTRAN)
void	updateColumnTransposeCpu (CoinIndexedVector &regionSparse, int whichCpu) const
	Updates one column (BTRAN)
void	updateFullColumn (CoinIndexedVector &regionSparse) const
	Updates one full column (FTRAN)
void	updateFullColumnTranspose (CoinIndexedVector &regionSparse) const
	Updates one full column (BTRAN)
void	updateWeights (CoinIndexedVector &regionSparse) const
	Updates one column for dual steepest edge weights (FTRAN)
Lifted from CoinFactorization
int	numberElements () const
	Total number of elements in factorization.
int	maximumPivots () const
	Maximum number of pivots between factorizations.
void	maximumPivots (int value)
	Set maximum number of pivots between factorizations.
bool	usingFT () const
	Returns true if doing FT.
int	pivots () const
	Returns number of pivots since factorization.
void	setPivots (int value) const
	Sets number of pivots since factorization.
double	areaFactor () const
	Whether larger areas needed.
void	areaFactor (double value)
	Set whether larger areas needed.
double	zeroTolerance () const
	Zero tolerance.
void	zeroTolerance (double value)
	Set zero tolerance.
void	saferTolerances (double zeroTolerance, double pivotTolerance)
	Set tolerances to safer of existing and given.
int	status () const
	Returns status.
void	setStatus (int value)
	Sets status.
int	numberDense () const
	Returns number of dense rows.
bool	timeToRefactorize () const
void	clearArrays ()
	Get rid of all memory.
int	numberRows () const
	Number of Rows after factorization.
int	numberSlacks () const
	Number of slacks at last factorization.
double	pivotTolerance () const
	Pivot tolerance.
void	pivotTolerance (double value)
	Set pivot tolerance.
double	minimumPivotTolerance () const
	Minimum pivot tolerance.
void	minimumPivotTolerance (double value)
	Set minimum pivot tolerance.
double *	pivotRegion () const
	pivot region
void	almostDestructor ()
	Allows change of pivot accuracy check 1.0 == none >1.0 relaxed.
void	setDenseThreshold (int number)
	So we can temporarily switch off dense.
int	getDenseThreshold () const
void	forceOtherFactorization (int which)
	If nonzero force use of 1,dense 2,small 3,long.
void	goDenseOrSmall (int numberRows)
	Go over to dense code.
int	goDenseThreshold () const
	Get switch to dense if number rows <= this.
void	setGoDenseThreshold (int value)
	Set switch to dense if number rows <= this.
int	goSmallThreshold () const
	Get switch to small if number rows <= this.
void	setGoSmallThreshold (int value)
	Set switch to small if number rows <= this.
int	goLongThreshold () const
	Get switch to long/ordered if number rows >= this.
void	setGoLongThreshold (int value)
	Set switch to long/ordered if number rows >= this.
int	typeOfFactorization () const
	Returns type.
void	synchronize (const ClpFactorization *otherFactorization, const AbcSimplex *model)
	Synchronize stuff.
other stuff
void	goSparse ()
	makes a row copy of L for speed and to allow very sparse problems
void	checkMarkArrays () const
bool	needToReorder () const
	Says whether to redo pivot order.
CoinAbcAnyFactorization *	factorization () const
	Pointer to factorization.

---

Detailed Description

This just implements AbcFactorization when an AbcMatrix object is passed.

Definition at line 22 of file AbcSimplexFactorization.hpp.

---

Constructor & Destructor Documentation

AbcSimplexFactorization::AbcSimplexFactorization

(

int

numberRows = 0

)

Default constructor.

AbcSimplexFactorization::~AbcSimplexFactorization

(

)

Destructor.

AbcSimplexFactorization::AbcSimplexFactorization	(	const AbcSimplexFactorization &	,
		int	denseIfSmaller = 0
	)

The copy constructor.

---

Member Function Documentation

int AbcSimplexFactorization::factorize	(	AbcSimplex *	model,
		int	solveType,
		bool	valuesPass
	)

When part of LP - given by basic variables.

Actually does factorization. Arrays passed in have non negative value to say basic. If status is okay, basic variables have pivot row - this is only needed if increasingRows_ >1. Allows scaling If status is singular, then basic variables have pivot row and ones thrown out have -1 returns 0 -okay, -1 singular, -2 too many in basis, -99 memory

AbcSimplexFactorization& AbcSimplexFactorization::operator=

(

const AbcSimplexFactorization &

)

void AbcSimplexFactorization::setFactorization

(

AbcSimplexFactorization &

rhs

)

Sets factorization.

double AbcSimplexFactorization::checkReplacePart1	(	CoinIndexedVector *	regionSparse,
		int	pivotRow
	)		[inline]

Checks if can replace one Column to basis, returns update alpha Fills in region for use later partial update already in U.

Definition at line 75 of file AbcSimplexFactorization.hpp.

double AbcSimplexFactorization::checkReplacePart1	(	CoinIndexedVector *	regionSparse,
		CoinIndexedVector *	partialUpdate,
		int	pivotRow
	)		[inline]

Checks if can replace one Column to basis, returns update alpha Fills in region for use later partial update in vector.

Definition at line 86 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::checkReplacePart1a	(	CoinIndexedVector *	regionSparse,
		int	pivotRow
	)		[inline]

Checks if can replace one Column to basis, returns update alpha Fills in region for use later partial update already in U.

Definition at line 94 of file AbcSimplexFactorization.hpp.

double AbcSimplexFactorization::checkReplacePart1b	(	CoinIndexedVector *	regionSparse,
		int	pivotRow
	)		[inline]

Definition at line 97 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::checkReplacePart2	(	int	pivotRow,
		double	btranAlpha,
		double	ftranAlpha,
		double	ftAlpha
	)		[inline]

Checks if can replace one Column to basis, returns 0=OK, 1=Probably OK, 2=singular, 3=no room, 5 max pivots.

Definition at line 102 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::replaceColumnPart3	(	const AbcSimplex *	model,
		CoinIndexedVector *	regionSparse,
		CoinIndexedVector *	tableauColumn,
		int	pivotRow,
		double	alpha
	)

Replaces one Column to basis, partial update already in U.

void AbcSimplexFactorization::replaceColumnPart3	(	const AbcSimplex *	model,
		CoinIndexedVector *	regionSparse,
		CoinIndexedVector *	tableauColumn,
		CoinIndexedVector *	partialUpdate,
		int	pivotRow,
		double	alpha
	)

Replaces one Column to basis, partial update in vector.

int AbcSimplexFactorization::updateColumnFT

(

CoinIndexedVector &

regionSparseFT

)

[inline]

Updates one column (FTRAN) Tries to do FT update number returned is negative if no room.

Definition at line 175 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::updateColumnFTPart1

(

CoinIndexedVector &

regionSparseFT

)

[inline]

Definition at line 177 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateColumnFTPart2

(

CoinIndexedVector &

regionSparseFT

)

[inline]

Definition at line 179 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateColumnFT	(	CoinIndexedVector &	regionSparseFT,
		CoinIndexedVector &	partialUpdate,
		int	which
	)		[inline]

Updates one column (FTRAN) Tries to do FT update puts partial update in vector.

Definition at line 184 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::updateColumn

(

CoinIndexedVector &

regionSparse

)

const [inline]

Updates one column (FTRAN)

Definition at line 189 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::updateTwoColumnsFT	(	CoinIndexedVector &	regionSparseFT,
		CoinIndexedVector &	regionSparseOther
	)		[inline]

Updates one column (FTRAN) from regionFT Tries to do FT update number returned is negative if no room.

Also updates regionOther

Definition at line 195 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::updateColumnTranspose

(

CoinIndexedVector &

regionSparse

)

const [inline]

Updates one column (BTRAN)

Definition at line 199 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateColumnCpu	(	CoinIndexedVector &	regionSparse,
		int	whichCpu
	)		const [inline]

Updates one column (FTRAN)

Definition at line 202 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateColumnTransposeCpu	(	CoinIndexedVector &	regionSparse,
		int	whichCpu
	)		const [inline]

Updates one column (BTRAN)

Definition at line 205 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateFullColumn

(

CoinIndexedVector &

regionSparse

)

const [inline]

Updates one full column (FTRAN)

Definition at line 208 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateFullColumnTranspose

(

CoinIndexedVector &

regionSparse

)

const [inline]

Updates one full column (BTRAN)

Definition at line 211 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::updateWeights

(

CoinIndexedVector &

regionSparse

)

const [inline]

Updates one column for dual steepest edge weights (FTRAN)

Definition at line 214 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::numberElements

(

)

const [inline]

Total number of elements in factorization.

Definition at line 220 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::maximumPivots

(

)

const [inline]

Maximum number of pivots between factorizations.

Definition at line 224 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::maximumPivots

(

int

value

)

[inline]

Set maximum number of pivots between factorizations.

Definition at line 228 of file AbcSimplexFactorization.hpp.

bool AbcSimplexFactorization::usingFT

(

)

const [inline]

Returns true if doing FT.

Definition at line 232 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::pivots

(

)

const [inline]

Returns number of pivots since factorization.

Definition at line 235 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::setPivots

(

int

value

)

const [inline]

Sets number of pivots since factorization.

Definition at line 239 of file AbcSimplexFactorization.hpp.

double AbcSimplexFactorization::areaFactor

(

)

const [inline]

Whether larger areas needed.

Definition at line 243 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::areaFactor

(

double

value

)

[inline]

Set whether larger areas needed.

Definition at line 247 of file AbcSimplexFactorization.hpp.

double AbcSimplexFactorization::zeroTolerance

(

)

const [inline]

Zero tolerance.

Definition at line 251 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::zeroTolerance

(

double

value

)

[inline]

Set zero tolerance.

Definition at line 255 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::saferTolerances	(	double	zeroTolerance,
		double	pivotTolerance
	)

Set tolerances to safer of existing and given.

int AbcSimplexFactorization::status

(

)

const [inline]

Returns status.

Definition at line 261 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::setStatus

(

int

value

)

[inline]

Sets status.

Definition at line 265 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::numberDense

(

)

const [inline]

Returns number of dense rows.

Definition at line 274 of file AbcSimplexFactorization.hpp.

bool AbcSimplexFactorization::timeToRefactorize

(

)

const [inline]

Definition at line 277 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::clearArrays

(

)

[inline]

Get rid of all memory.

Definition at line 281 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::numberRows

(

)

const [inline]

Number of Rows after factorization.

Definition at line 285 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::numberSlacks

(

)

const [inline]

Number of slacks at last factorization.

Definition at line 289 of file AbcSimplexFactorization.hpp.

double AbcSimplexFactorization::pivotTolerance

(

)

const [inline]

Pivot tolerance.

Definition at line 292 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::pivotTolerance

(

double

value

)

[inline]

Set pivot tolerance.

Definition at line 296 of file AbcSimplexFactorization.hpp.

double AbcSimplexFactorization::minimumPivotTolerance

(

)

const [inline]

Minimum pivot tolerance.

Definition at line 300 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::minimumPivotTolerance

(

double

value

)

[inline]

Set minimum pivot tolerance.

Definition at line 304 of file AbcSimplexFactorization.hpp.

double* AbcSimplexFactorization::pivotRegion

(

)

const [inline]

pivot region

Definition at line 308 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::almostDestructor

(

)

[inline]

Allows change of pivot accuracy check 1.0 == none >1.0 relaxed.

Delete all stuff (leaves as after CoinFactorization())

Definition at line 315 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::setDenseThreshold

(

int

number

)

So we can temporarily switch off dense.

int AbcSimplexFactorization::getDenseThreshold

(

)

const

void AbcSimplexFactorization::forceOtherFactorization

(

int

which

)

If nonzero force use of 1,dense 2,small 3,long.

void AbcSimplexFactorization::goDenseOrSmall

(

int

numberRows

)

Go over to dense code.

int AbcSimplexFactorization::goDenseThreshold

(

)

const [inline]

Get switch to dense if number rows <= this.

Definition at line 326 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::setGoDenseThreshold

(

int

value

)

[inline]

Set switch to dense if number rows <= this.

Definition at line 330 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::goSmallThreshold

(

)

const [inline]

Get switch to small if number rows <= this.

Definition at line 334 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::setGoSmallThreshold

(

int

value

)

[inline]

Set switch to small if number rows <= this.

Definition at line 338 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::goLongThreshold

(

)

const [inline]

Get switch to long/ordered if number rows >= this.

Definition at line 342 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::setGoLongThreshold

(

int

value

)

[inline]

Set switch to long/ordered if number rows >= this.

Definition at line 346 of file AbcSimplexFactorization.hpp.

int AbcSimplexFactorization::typeOfFactorization

(

)

const [inline]

Returns type.

Definition at line 350 of file AbcSimplexFactorization.hpp.

void AbcSimplexFactorization::synchronize	(	const ClpFactorization *	otherFactorization,
		const AbcSimplex *	model
	)

Synchronize stuff.

void AbcSimplexFactorization::goSparse

(

)

makes a row copy of L for speed and to allow very sparse problems

void AbcSimplexFactorization::checkMarkArrays

(

)

const [inline]

Definition at line 361 of file AbcSimplexFactorization.hpp.

bool AbcSimplexFactorization::needToReorder

(

)

const [inline]

Says whether to redo pivot order.

Definition at line 365 of file AbcSimplexFactorization.hpp.

CoinAbcAnyFactorization* AbcSimplexFactorization::factorization

(

)

const [inline]

Pointer to factorization.

Definition at line 367 of file AbcSimplexFactorization.hpp.

---

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

• src/AbcSimplexFactorization.hpp