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Public Types | List of all members
ClpPrimalColumnSteepest Class Reference

Primal Column Pivot Steepest Edge Algorithm Class. More...

`#include <ClpPrimalColumnSteepest.hpp>`

Inheritance diagram for ClpPrimalColumnSteepest:
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Collaboration diagram for ClpPrimalColumnSteepest:
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## Public Types
enum | Persistence { normal = 0x00, keep = 0x01 }
| enums for persistence More...

## Public Member Functions
Algorithmic methods
virtual int | pivotColumn (CoinIndexedVector *updates, CoinIndexedVector *spareRow1, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Returns pivot column, -1 if none. More...
int | pivotColumnOldMethod (CoinIndexedVector *updates, CoinIndexedVector *spareRow1, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| For quadratic or funny nonlinearities. More...
void | justDjs (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Just update djs. More...
int | partialPricing (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, int numberWanted, int numberLook)
| Update djs doing partial pricing (dantzig) More...
void | djsAndDevex (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Update djs, weights for Devex using djs. More...
void | djsAndSteepest (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Update djs, weights for Steepest using djs. More...
void | djsAndDevex2 (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Update djs, weights for Devex using pivot row. More...
void | djsAndSteepest2 (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Update djs, weights for Steepest using pivot row. More...
void | justDevex (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Update weights for Devex. More...
void | justSteepest (CoinIndexedVector *updates, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)
| Update weights for Steepest. More...
void | transposeTimes2 (const CoinIndexedVector *pi1, CoinIndexedVector *dj1, const CoinIndexedVector *pi2, CoinIndexedVector *dj2, CoinIndexedVector *spare, double scaleFactor)
| Updates two arrays for steepest. More...
virtual void | updateWeights (CoinIndexedVector *input)
| Updates weights - part 1 - also checks accuracy. More...
void | checkAccuracy (int sequence, double relativeTolerance, CoinIndexedVector *rowArray1, CoinIndexedVector *rowArray2)
| Checks accuracy - just for debug. More...
void | initializeWeights ()
| Initialize weights. More...
virtual void | saveWeights (ClpSimplex *model, int mode)
| Save weights - this may initialize weights as well mode is - 1) before factorization 2) after factorization 3) just redo infeasibilities 4) restore weights 5) at end of values pass (so need initialization) More...
virtual void | unrollWeights ()
| Gets rid of last update. More...
virtual void | clearArrays ()
| Gets rid of all arrays. More...
virtual bool | looksOptimal () const
| Returns true if would not find any column. More...
virtual void | maximumPivotsChanged ()
| Called when maximum pivots changes. More...
gets and sets
int | mode () const
| Mode. More...
virtual int | numberSprintColumns (int &numberIterations) const
| Returns number of extra columns for sprint algorithm - 0 means off. More...
virtual void | switchOffSprint ()
| Switch off sprint idea. More...
Constructors and destructors
| ClpPrimalColumnSteepest (int mode=3)
| Default Constructor 0 is exact devex, 1 full steepest, 2 is partial exact devex 3 switches between 0 and 2 depending on factorization 4 starts as partial dantzig/devex but then may switch between 0 and 2. More...
| ClpPrimalColumnSteepest (const ClpPrimalColumnSteepest &rhs)
| Copy constructor. More...
ClpPrimalColumnSteepest & | operator= (const ClpPrimalColumnSteepest &rhs)
| Assignment operator. More...
virtual | ~ClpPrimalColumnSteepest ()
| Destructor. More...
virtual ClpPrimalColumnPivot * | clone (bool copyData=true) const
| Clone. More...
Private functions to deal with devex
bool | reference (int i) const
| reference would be faster using ClpSimplex's status_, but I prefer to keep modularity. More...
void | setReference (int i, bool trueFalse)
| reference would be faster using ClpSimplex's status_, but I prefer to keep modularity. More...
void | setPersistence (Persistence life)
| Set/ get persistence. More...
Persistence | persistence () const
| reference would be faster using ClpSimplex's status_, but I prefer to keep modularity. More...
Public Member Functions inherited from ClpPrimalColumnPivot
virtual int | pivotRow (double &way)
| Signals pivot row choice: -2 (default) - use normal pivot row choice -1 to numberRows-1 - use this (will be checked) way should be -1 to go to lower bound, +1 to upper bound. More...
virtual void | setLooksOptimal (bool flag)
| Sets optimality flag (for advanced use) More...
| ClpPrimalColumnPivot ()
| Default Constructor. More...
| ClpPrimalColumnPivot (const ClpPrimalColumnPivot &)
| Copy constructor. More...
ClpPrimalColumnPivot & | operator= (const ClpPrimalColumnPivot &rhs)
| Assignment operator. More...
virtual | ~ClpPrimalColumnPivot ()
| Destructor. More...
ClpSimplex * | model ()
| Returns model. More...
void | setModel (ClpSimplex *newmodel)
| Sets model. More...
int | type ()
| Returns type (above 63 is extra information) More...

## Private Attributes
Private member data
double | devex_
| weight array More...
double * | weights_
| weight array More...
CoinIndexedVector * | infeasible_
| square of infeasibility array (just for infeasible columns) More...
CoinIndexedVector * | alternateWeights_
| alternate weight array (so we can unroll) More...
double * | savedWeights_
| save weight array (so we can use checkpoint) More...
unsigned int * | reference_
| weight array More...
int | state_
| Status 0) Normal -1) Needs initialization 1) Weights are stored by sequence number. More...
int | mode_
| 0 is exact devex, 1 full steepest, 2 is partial exact devex 3 switches between 0 and 2 depending on factorization 4 starts as partial dantzig/devex but then may switch between 0 and 2. More...
Persistence | persistence_
| Life of weights. More...
int | numberSwitched_
| Number of times switched from partial dantzig to 0/2. More...
int | pivotSequence_
| weight array More...
int | savedPivotSequence_
| weight array More...
int | savedSequenceOut_
| weight array More...
int | lastRectified_
| weight array More...
int | sizeFactorization_
| weight array More...

## Additional Inherited Members
Protected Attributes inherited from ClpPrimalColumnPivot
ClpSimplex * | model_
| Pointer to model. More...
int | type_
| Type of column pivot algorithm. More...
bool | looksOptimal_
| Says if looks optimal (normally computed) More...

## Detailed Description

Primal Column Pivot Steepest Edge Algorithm Class.

See Forrest-Goldfarb paper for algorithm

Definition at line 23 of file ClpPrimalColumnSteepest.hpp.

## Member Enumeration Documentation

enum ClpPrimalColumnSteepest::Persistence

enums for persistence

Enumerator
normal |
keep |

Definition at line 140 of file ClpPrimalColumnSteepest.hpp.

## Constructor & Destructor Documentation

ClpPrimalColumnSteepest::ClpPrimalColumnSteepest | ( | int | mode = `3` | ) |

Default Constructor 0 is exact devex, 1 full steepest, 2 is partial exact devex 3 switches between 0 and 2 depending on factorization 4 starts as partial dantzig/devex but then may switch between 0 and 2.

By partial exact devex is meant that the weights are updated as normal but only part of the nonbasic variables are scanned. This can be faster on very easy problems.

ClpPrimalColumnSteepest::ClpPrimalColumnSteepest | ( | const ClpPrimalColumnSteepest & | rhs | ) |

Copy constructor.

virtual ClpPrimalColumnSteepest::~ClpPrimalColumnSteepest | ( |  | ) |
| virtual

Destructor.

## Member Function Documentation

virtual int ClpPrimalColumnSteepest::pivotColumn | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow1,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |
| virtual

Returns pivot column, -1 if none.

The Packed CoinIndexedVector updates has cost updates - for normal LP that is just +-weight where a feasibility changed. It also has reduced cost from last iteration in pivot row Parts of operation split out into separate functions for profiling and speed

Implements ClpPrimalColumnPivot.

int ClpPrimalColumnSteepest::pivotColumnOldMethod | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow1,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

For quadratic or funny nonlinearities.

void ClpPrimalColumnSteepest::justDjs | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Just update djs.

int ClpPrimalColumnSteepest::partialPricing | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | int | numberWanted,
|  | int | numberLook
| ) |  |

Update djs doing partial pricing (dantzig)

void ClpPrimalColumnSteepest::djsAndDevex | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Update djs, weights for Devex using djs.

void ClpPrimalColumnSteepest::djsAndSteepest | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Update djs, weights for Steepest using djs.

void ClpPrimalColumnSteepest::djsAndDevex2 | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Update djs, weights for Devex using pivot row.

void ClpPrimalColumnSteepest::djsAndSteepest2 | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Update djs, weights for Steepest using pivot row.

void ClpPrimalColumnSteepest::justDevex | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Update weights for Devex.

void ClpPrimalColumnSteepest::justSteepest | ( | CoinIndexedVector * | updates,
|  | CoinIndexedVector * | spareRow2,
|  | CoinIndexedVector * | spareColumn1,
|  | CoinIndexedVector * | spareColumn2
| ) |  |

Update weights for Steepest.

void ClpPrimalColumnSteepest::transposeTimes2 | ( | const CoinIndexedVector * | pi1,
|  | CoinIndexedVector * | dj1,
|  | const CoinIndexedVector * | pi2,
|  | CoinIndexedVector * | dj2,
|  | CoinIndexedVector * | spare,
|  | double | scaleFactor
| ) |  |

Updates two arrays for steepest.

virtual void ClpPrimalColumnSteepest::updateWeights | ( | CoinIndexedVector * | input | ) |
| virtual

Updates weights - part 1 - also checks accuracy.

Reimplemented from ClpPrimalColumnPivot.

void ClpPrimalColumnSteepest::checkAccuracy | ( | int | sequence,
|  | double | relativeTolerance,
|  | CoinIndexedVector * | rowArray1,
|  | CoinIndexedVector * | rowArray2
| ) |  |

Checks accuracy - just for debug.

void ClpPrimalColumnSteepest::initializeWeights | ( |  | ) |

Initialize weights.

virtual void ClpPrimalColumnSteepest::saveWeights | ( | ClpSimplex * | model,
|  | int | mode
| ) |  |
| virtual

Save weights - this may initialize weights as well mode is - 1) before factorization 2) after factorization 3) just redo infeasibilities 4) restore weights 5) at end of values pass (so need initialization)

Implements ClpPrimalColumnPivot.

virtual void ClpPrimalColumnSteepest::unrollWeights | ( |  | ) |
| virtual

Gets rid of last update.

virtual void ClpPrimalColumnSteepest::clearArrays | ( |  | ) |
| virtual

Gets rid of all arrays.

Reimplemented from ClpPrimalColumnPivot.

virtual bool ClpPrimalColumnSteepest::looksOptimal | ( |  | ) | const
| virtual

Returns true if would not find any column.

Reimplemented from ClpPrimalColumnPivot.

virtual void ClpPrimalColumnSteepest::maximumPivotsChanged | ( |  | ) |
| virtual

Called when maximum pivots changes.

Reimplemented from ClpPrimalColumnPivot.

int ClpPrimalColumnSteepest::mode | ( |  | ) | const
| inline

Mode.

Definition at line 126 of file ClpPrimalColumnSteepest.hpp.

virtual int ClpPrimalColumnSteepest::numberSprintColumns | ( | int & | numberIterations | ) | const
| virtual

Returns number of extra columns for sprint algorithm - 0 means off.

Also number of iterations before recompute

Reimplemented from ClpPrimalColumnPivot.

virtual void ClpPrimalColumnSteepest::switchOffSprint | ( |  | ) |
| virtual

Switch off sprint idea.

Reimplemented from ClpPrimalColumnPivot.

ClpPrimalColumnSteepest& ClpPrimalColumnSteepest::operator= | ( | const ClpPrimalColumnSteepest & | rhs | ) |

Assignment operator.

virtual ClpPrimalColumnPivot* ClpPrimalColumnSteepest::clone | ( | bool | copyData = `true` | ) | const
| virtual

Clone.

Implements ClpPrimalColumnPivot.

bool ClpPrimalColumnSteepest::reference | ( | int | i | ) | const
| inline

reference would be faster using ClpSimplex's status_, but I prefer to keep modularity.

Definition at line 175 of file ClpPrimalColumnSteepest.hpp.

void ClpPrimalColumnSteepest::setReference | ( | int | i,
|  | bool | trueFalse
| ) |  |
| inline

reference would be faster using ClpSimplex's status_, but I prefer to keep modularity.

Definition at line 178 of file ClpPrimalColumnSteepest.hpp.

void ClpPrimalColumnSteepest::setPersistence | ( | Persistence | life | ) |
| inline

Set/ get persistence.

Definition at line 187 of file ClpPrimalColumnSteepest.hpp.

Persistence ClpPrimalColumnSteepest::persistence | ( |  | ) | const
| inline

reference would be faster using ClpSimplex's status_, but I prefer to keep modularity.

Definition at line 190 of file ClpPrimalColumnSteepest.hpp.

## Member Data Documentation

double ClpPrimalColumnSteepest::devex_
| private

weight array

Definition at line 200 of file ClpPrimalColumnSteepest.hpp.

double* ClpPrimalColumnSteepest::weights_
| private

weight array

Definition at line 202 of file ClpPrimalColumnSteepest.hpp.

CoinIndexedVector* ClpPrimalColumnSteepest::infeasible_
| private

square of infeasibility array (just for infeasible columns)

Definition at line 204 of file ClpPrimalColumnSteepest.hpp.

CoinIndexedVector* ClpPrimalColumnSteepest::alternateWeights_
| private

alternate weight array (so we can unroll)

Definition at line 206 of file ClpPrimalColumnSteepest.hpp.

double* ClpPrimalColumnSteepest::savedWeights_
| private

save weight array (so we can use checkpoint)

Definition at line 208 of file ClpPrimalColumnSteepest.hpp.

unsigned int* ClpPrimalColumnSteepest::reference_
| private

weight array

Definition at line 210 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::state_
| private

Status 0) Normal -1) Needs initialization 1) Weights are stored by sequence number.

Definition at line 216 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::mode_
| private

0 is exact devex, 1 full steepest, 2 is partial exact devex 3 switches between 0 and 2 depending on factorization 4 starts as partial dantzig/devex but then may switch between 0 and 2.

5 is always partial dantzig By partial exact devex is meant that the weights are updated as normal but only part of the nonbasic variables are scanned. This can be faster on very easy problems.

New dubious option is >=10 which does mini-sprint

Definition at line 229 of file ClpPrimalColumnSteepest.hpp.

Persistence ClpPrimalColumnSteepest::persistence_
| private

Life of weights.

Definition at line 231 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::numberSwitched_
| private

Number of times switched from partial dantzig to 0/2.

Definition at line 233 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::pivotSequence_
| private

weight array

Definition at line 235 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::savedPivotSequence_
| private

weight array

Definition at line 237 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::savedSequenceOut_
| private

weight array

Definition at line 239 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::lastRectified_
| private

weight array

Definition at line 241 of file ClpPrimalColumnSteepest.hpp.

int ClpPrimalColumnSteepest::sizeFactorization_
| private

weight array

Definition at line 243 of file ClpPrimalColumnSteepest.hpp.

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

- /tmp/CHiPPS-Blis-0.94.3/Clp/src/ClpPrimalColumnSteepest.hpp