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CoinOslFactorization Class Reference

`#include <CoinOslFactorization.hpp>`

Inheritance diagram for CoinOslFactorization:
[legend]
Collaboration diagram for CoinOslFactorization:
[legend]

## Public Member Functions
void | gutsOfDestructor (bool clearFact=true)
| The real work of desstructor. More...
void | gutsOfInitialize (bool zapFact=true)
| The real work of constructor. More...
void | gutsOfCopy (const CoinOslFactorization &other)
| The real work of copy. More...
Constructors and destructor and copy
| CoinOslFactorization ()
| Default constructor. More...
| CoinOslFactorization (const CoinOslFactorization &other)
| Copy constructor. More...
virtual | ~CoinOslFactorization ()
| Destructor. More...
CoinOslFactorization & | operator= (const CoinOslFactorization &other)
| = copy More...
virtual CoinOtherFactorization * | clone () const
| Clone. More...
Do factorization - public
virtual void | getAreas (int numberRows, int numberColumns, int maximumL, int maximumU)
| Gets space for a factorization. More...
virtual void | preProcess ()
| PreProcesses column ordered copy of basis. More...
virtual int | factor ()
| Does most of factorization returning status 0 - OK -99 - needs more memory -1 - singular - use numberGoodColumns and redo. More...
virtual void | postProcess (const int *sequence, int *pivotVariable)
| Does post processing on valid factorization - putting variables on correct rows. More...
virtual void | makeNonSingular (int *sequence, int numberColumns)
| Makes a non-singular basis by replacing variables. More...
int | factorize (const CoinPackedMatrix &matrix, int rowIsBasic[], int columnIsBasic[], double areaFactor=0.0)
| When part of LP - given by basic variables. More...
general stuff such as number of elements
virtual int | numberElements () const
| Total number of elements in factorization. More...
virtual CoinFactorizationDouble * | elements () const
| Returns array to put basis elements in. More...
virtual int * | pivotRow () const
| Returns pivot row. More...
virtual CoinFactorizationDouble * | workArea () const
| Returns work area. More...
virtual int * | intWorkArea () const
| Returns int work area. More...
virtual int * | numberInRow () const
| Number of entries in each row. More...
virtual int * | numberInColumn () const
| Number of entries in each column. More...
virtual int * | starts () const
| Returns array to put basis starts in. More...
virtual int * | permuteBack () const
| Returns permute back. More...
virtual bool | wantsTableauColumn () const
| Returns true if wants tableauColumn in replaceColumn. More...
virtual void | setUsefulInformation (const int *info, int whereFrom)
| Useful information for factorization 0 - iteration number whereFrom is 0 for factorize and 1 for replaceColumn. More...
virtual void | maximumPivots (int value)
| Set maximum pivots. More...
double | maximumCoefficient () const
| Returns maximum absolute value in factorization. More...
double | conditionNumber () const
| Condition number - product of pivots after factorization. More...
virtual void | clearArrays ()
| Get rid of all memory. More...
rank one updates which do exist
virtual int | replaceColumn (CoinIndexedVector *regionSparse, int pivotRow, double pivotCheck, bool checkBeforeModifying=false, double acceptablePivot=1.0e-8)
| Replaces one Column to basis, returns 0=OK, 1=Probably OK, 2=singular, 3=no room If checkBeforeModifying is true will do all accuracy checks before modifying factorization. More...
various uses of factorization (return code number elements)
which user may want to know about
virtual int | updateColumnFT (CoinIndexedVector *regionSparse, CoinIndexedVector *regionSparse2, bool noPermute=false)
| Updates one column (FTRAN) from regionSparse2 Tries to do FT update number returned is negative if no room regionSparse starts as zero and is zero at end. More...
virtual int | updateColumn (CoinIndexedVector *regionSparse, CoinIndexedVector *regionSparse2, bool noPermute=false) const
| This version has same effect as above with FTUpdate==false so number returned is always >=0. More...
virtual int | updateTwoColumnsFT (CoinIndexedVector *regionSparse1, CoinIndexedVector *regionSparse2, CoinIndexedVector *regionSparse3, bool noPermute=false)
| does FTRAN on two columns More...
virtual int | updateColumnTranspose (CoinIndexedVector *regionSparse, CoinIndexedVector *regionSparse2) const
| Updates one column (BTRAN) from regionSparse2 regionSparse starts as zero and is zero at end Note - if regionSparse2 packed on input - will be packed on output. More...
various uses of factorization
*** Below this user may not want to know about which user may not want to know about (left over from my LP code)
virtual int * | indices () const
| Get rid of all memory. More...
virtual int * | permute () const
| Returns permute in. More...
Public Member Functions inherited from CoinOtherFactorization
| CoinOtherFactorization ()
| Default constructor. More...
| CoinOtherFactorization (const CoinOtherFactorization &other)
| Copy constructor. More...
virtual | ~CoinOtherFactorization ()
| Destructor. More...
CoinOtherFactorization & | operator= (const CoinOtherFactorization &other)
| = copy More...
int | status () const
| Returns status. More...
void | setStatus (int value)
| Sets status. More...
int | pivots () const
| Returns number of pivots since factorization. More...
void | setPivots (int value)
| Sets number of pivots since factorization. More...
void | setNumberRows (int value)
| Set number of Rows after factorization. More...
int | numberRows () const
| Number of Rows after factorization. More...
int | numberColumns () const
| Total number of columns in factorization. More...
int | numberGoodColumns () const
| Number of good columns in factorization. More...
void | relaxAccuracyCheck (double value)
| Allows change of pivot accuracy check 1.0 == none >1.0 relaxed. More...
double | getAccuracyCheck () const
int | maximumPivots () const
| Maximum number of pivots between factorizations. More...
double | pivotTolerance () const
| Pivot tolerance. More...
void | pivotTolerance (double value)
double | zeroTolerance () const
| Zero tolerance. More...
void | zeroTolerance (double value)
double | slackValue () const
| Whether slack value is +1 or -1. More...
void | slackValue (double value)
int | solveMode () const
| Get solve mode e.g. More...
void | setSolveMode (int value)
| Set solve mode e.g. More...

## Protected Member Functions
int | checkPivot (double saveFromU, double oldPivot) const
| Returns accuracy status of replaceColumn returns 0=OK, 1=Probably OK, 2=singular. More...

## Protected Attributes
data
EKKfactinfo | factInfo_
| Osl factorization data. More...
Protected Attributes inherited from CoinOtherFactorization
double | pivotTolerance_
| Pivot tolerance. More...
double | zeroTolerance_
| Zero tolerance. More...
double | slackValue_
| Whether slack value is +1 or -1. More...
double | relaxCheck_
| Relax check on accuracy in replaceColumn. More...
int | factorElements_
| Number of elements after factorization. More...
int | numberRows_
| Number of Rows in factorization. More...
int | numberColumns_
| Number of Columns in factorization. More...
int | numberGoodU_
| Number factorized in U (not row singletons) More...
int | maximumPivots_
| Maximum number of pivots before factorization. More...
int | numberPivots_
| Number pivots since last factorization. More...
int | status_
| Status of factorization. More...
int | maximumRows_
| Maximum rows ever (i.e. use to copy arrays etc) More...
int | maximumSpace_
| Maximum length of iterating area. More...
int * | pivotRow_
| Pivot row. More...
CoinFactorizationDouble * | elements_
| Elements of factorization and updates length is maxR*maxR+maxSpace will always be long enough so can have nR*nR ints in maxSpace. More...
CoinFactorizationDouble * | workArea_
| Work area of numberRows_. More...
int | solveMode_
| Solve mode e.g. More...

## Friends
void | CoinOslFactorizationUnitTest (const std::string &mpsDir)

## Detailed Description

Definition at line 108 of file CoinOslFactorization.hpp.

## Constructor & Destructor Documentation

CoinOslFactorization::CoinOslFactorization | ( |  | ) |

Default constructor.

CoinOslFactorization::CoinOslFactorization | ( | const CoinOslFactorization & | other | ) |

Copy constructor.

virtual CoinOslFactorization::~CoinOslFactorization | ( |  | ) |
| virtual

Destructor.

## Member Function Documentation

CoinOslFactorization& CoinOslFactorization::operator= | ( | const CoinOslFactorization & | other | ) |

= copy

virtual CoinOtherFactorization* CoinOslFactorization::clone | ( |  | ) | const
| virtual

Clone.

Implements CoinOtherFactorization.

virtual void CoinOslFactorization::getAreas | ( | int | numberRows,
|  | int | numberColumns,
|  | int | maximumL,
|  | int | maximumU
| ) |  |
| virtual

Gets space for a factorization.

Implements CoinOtherFactorization.

virtual void CoinOslFactorization::preProcess | ( |  | ) |
| virtual

PreProcesses column ordered copy of basis.

Implements CoinOtherFactorization.

virtual int CoinOslFactorization::factor | ( |  | ) |
| virtual

Does most of factorization returning status 0 - OK -99 - needs more memory -1 - singular - use numberGoodColumns and redo.

Implements CoinOtherFactorization.

virtual void CoinOslFactorization::postProcess | ( | const int * | sequence,
|  | int * | pivotVariable
| ) |  |
| virtual

Does post processing on valid factorization - putting variables on correct rows.

Implements CoinOtherFactorization.

virtual void CoinOslFactorization::makeNonSingular | ( | int * | sequence,
|  | int | numberColumns
| ) |  |
| virtual

Makes a non-singular basis by replacing variables.

Implements CoinOtherFactorization.

int CoinOslFactorization::factorize | ( | const CoinPackedMatrix & | matrix,
|  | int | rowIsBasic[],
|  | int | columnIsBasic[],
|  | double | areaFactor = `0.0`
| ) |  |

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 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

virtual int CoinOslFactorization::numberElements | ( |  | ) | const
| inline virtual

Total number of elements in factorization.

Implements CoinOtherFactorization.

Definition at line 162 of file CoinOslFactorization.hpp.

virtual CoinFactorizationDouble* CoinOslFactorization::elements | ( |  | ) | const
| virtual

Returns array to put basis elements in.

Reimplemented from CoinOtherFactorization.

virtual int* CoinOslFactorization::pivotRow | ( |  | ) | const
| virtual

Returns pivot row.

Reimplemented from CoinOtherFactorization.

virtual CoinFactorizationDouble* CoinOslFactorization::workArea | ( |  | ) | const
| virtual

Returns work area.

Reimplemented from CoinOtherFactorization.

virtual int* CoinOslFactorization::intWorkArea | ( |  | ) | const
| virtual

Returns int work area.

Reimplemented from CoinOtherFactorization.

virtual int* CoinOslFactorization::numberInRow | ( |  | ) | const
| virtual

Number of entries in each row.

Reimplemented from CoinOtherFactorization.

virtual int* CoinOslFactorization::numberInColumn | ( |  | ) | const
| virtual

Number of entries in each column.

Reimplemented from CoinOtherFactorization.

virtual int* CoinOslFactorization::starts | ( |  | ) | const
| virtual

Returns array to put basis starts in.

Reimplemented from CoinOtherFactorization.

virtual int* CoinOslFactorization::permuteBack | ( |  | ) | const
| virtual

Returns permute back.

Reimplemented from CoinOtherFactorization.

virtual bool CoinOslFactorization::wantsTableauColumn | ( |  | ) | const
| virtual

Returns true if wants tableauColumn in replaceColumn.

Reimplemented from CoinOtherFactorization.

virtual void CoinOslFactorization::setUsefulInformation | ( | const int * | info,
|  | int | whereFrom
| ) |  |
| virtual

Useful information for factorization 0 - iteration number whereFrom is 0 for factorize and 1 for replaceColumn.

Reimplemented from CoinOtherFactorization.

virtual void CoinOslFactorization::maximumPivots | ( | int | value | ) |
| virtual

Set maximum pivots.

Reimplemented from CoinOtherFactorization.

double CoinOslFactorization::maximumCoefficient | ( |  | ) | const

Returns maximum absolute value in factorization.

double CoinOslFactorization::conditionNumber | ( |  | ) | const

Condition number - product of pivots after factorization.

virtual void CoinOslFactorization::clearArrays | ( |  | ) |
| virtual

Get rid of all memory.

Reimplemented from CoinOtherFactorization.

virtual int CoinOslFactorization::replaceColumn | ( | CoinIndexedVector * | regionSparse,
|  | int | pivotRow,
|  | double | pivotCheck,
|  | bool | checkBeforeModifying = `false`,
|  | double | acceptablePivot = `1.0e-8`
| ) |  |
| virtual

Replaces one Column to basis, returns 0=OK, 1=Probably OK, 2=singular, 3=no room If checkBeforeModifying is true will do all accuracy checks before modifying factorization.

Whether to set this depends on speed considerations. You could just do this on first iteration after factorization and thereafter re-factorize partial update already in U

Implements CoinOtherFactorization.

virtual int CoinOslFactorization::updateColumnFT | ( | CoinIndexedVector * | regionSparse,
|  | CoinIndexedVector * | regionSparse2,
|  | bool | noPermute = `false`
| ) |  |
| virtual

Updates one column (FTRAN) from regionSparse2 Tries to do FT update number returned is negative if no room regionSparse starts as zero and is zero at end.

Note - if regionSparse2 packed on input - will be packed on output

Implements CoinOtherFactorization.

virtual int CoinOslFactorization::updateColumn | ( | CoinIndexedVector * | regionSparse,
|  | CoinIndexedVector * | regionSparse2,
|  | bool | noPermute = `false`
| ) |  | const
| virtual

This version has same effect as above with FTUpdate==false so number returned is always >=0.

Implements CoinOtherFactorization.

virtual int CoinOslFactorization::updateTwoColumnsFT | ( | CoinIndexedVector * | regionSparse1,
|  | CoinIndexedVector * | regionSparse2,
|  | CoinIndexedVector * | regionSparse3,
|  | bool | noPermute = `false`
| ) |  |
| virtual

does FTRAN on two columns

Implements CoinOtherFactorization.

virtual int CoinOslFactorization::updateColumnTranspose | ( | CoinIndexedVector * | regionSparse,
|  | CoinIndexedVector * | regionSparse2
| ) |  | const
| virtual

Updates one column (BTRAN) from regionSparse2 regionSparse starts as zero and is zero at end Note - if regionSparse2 packed on input - will be packed on output.

Implements CoinOtherFactorization.

virtual int* CoinOslFactorization::indices | ( |  | ) | const
| virtual

Get rid of all memory.

Returns array to put basis indices in

Implements CoinOtherFactorization.

virtual int* CoinOslFactorization::permute | ( |  | ) | const
| inline virtual

Returns permute in.

Implements CoinOtherFactorization.

Definition at line 257 of file CoinOslFactorization.hpp.

void CoinOslFactorization::gutsOfDestructor | ( | bool | clearFact = `true` | ) |

The real work of desstructor.

void CoinOslFactorization::gutsOfInitialize | ( | bool | zapFact = `true` | ) |

The real work of constructor.

void CoinOslFactorization::gutsOfCopy | ( | const CoinOslFactorization & | other | ) |

The real work of copy.

int CoinOslFactorization::checkPivot | ( | double | saveFromU,
|  | double | oldPivot
| ) |  | const
| protected

Returns accuracy status of replaceColumn returns 0=OK, 1=Probably OK, 2=singular.

## Friends And Related Function Documentation

void CoinOslFactorizationUnitTest | ( | const std::string & | mpsDir | ) |
| friend

## Member Data Documentation

EKKfactinfo CoinOslFactorization::factInfo_
| protected

Osl factorization data.

Definition at line 281 of file CoinOslFactorization.hpp.

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

- /tmp/Cgl-0.60.2/CoinUtils/src/CoinOslFactorization.hpp