#include <CoinPresolveUseless.hpp>
Inheritance diagram for useless_constraint_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... | |
| virtual | ~useless_constraint_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 int *useless_rows, int nuseless_rows, 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... | |
Related Functions | |
(Note that these are not member functions.) | |
| const CoinPresolveAction * | testRedundant (CoinPresolveMatrix *prob, const CoinPresolveAction *next) |
| Scan constraints looking for useless constraints. More... | |
Additional Inherited Members | |
| Public Attributes inherited from CoinPresolveAction | |
| const CoinPresolveAction * | next |
| The next presolve transformation. More... | |
Detailed Description
Definition at line 10 of file CoinPresolveUseless.hpp.
Constructor & Destructor Documentation
◆ ~useless_constraint_action()
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virtual |
Member Function Documentation
◆ name()
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virtual |
A name for debug printing.
It is expected that the name is not stored in the transform itself.
Implements CoinPresolveAction.
◆ presolve()
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static |
◆ postsolve()
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virtual |
Apply the postsolve transformation for this particular presolve action.
Implements CoinPresolveAction.
Friends And Related Function Documentation
◆ testRedundant()
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related |
Scan constraints looking for useless constraints.
A front end to identify useless constraints and hand them to useless_constraint_action::presolve() for processing.
In a bit more detail, the routine implements a greedy algorithm that identifies a set of necessary constraints. A constraint is necessary if it implies a tighter bound on a variable than the original column bound. These tighter column bounds are then used to calculate row activity and identify constraints that are useless given the presence of the necessary constraints.
The documentation for this class was generated from the following file:
- /builddir/build/BUILD/CoinUtils-2.11.3/src/CoinPresolveUseless.hpp
