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CoinPresolveUseless.hpp
Go to the documentation of this file.
1 /* $Id: CoinPresolveUseless.hpp 2083 2019-01-06 19:38:09Z unxusr $ */
2 // Copyright (C) 2002, International Business Machines
3 // Corporation and others. All Rights Reserved.
4 // This code is licensed under the terms of the Eclipse Public License (EPL).
5
6 #ifndef CoinPresolveUseless_H
7 #define CoinPresolveUseless_H
8 #define USELESS 20
9
10 class useless_constraint_action : public CoinPresolveAction {
11 struct action {
12 double rlo;
13 double rup;
14 const int *rowcols;
15 const double *rowels;
16 int row;
17 int ninrow;
18 };
19
20 const int nactions_;
21 const action *const actions_;
22
23 useless_constraint_action(int nactions,
24 const action *actions,
25 const CoinPresolveAction *next);
26
27 public:
28 const char *name() const;
29
30 // These rows are asserted to be useless,
31 // that is, given a solution the row activity
32 // must be in range.
33 static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
34 const int *useless_rows,
35 int nuseless_rows,
36 const CoinPresolveAction *next);
37
38 void postsolve(CoinPostsolveMatrix *prob) const;
39
40 virtual ~useless_constraint_action();
41 };
42
57 const CoinPresolveAction *testRedundant(CoinPresolveMatrix *prob,
58 const CoinPresolveAction *next);
59
60 #endif
61
62 /* vi: softtabstop=2 shiftwidth=2 expandtab tabstop=2
63 */
useless_constraint_action::postsolve
void postsolve(CoinPostsolveMatrix *prob) const
Apply the postsolve transformation for this particular presolve action.
useless_constraint_action::nactions_
const int nactions_
Definition: CoinPresolveUseless.hpp:20
useless_constraint_action::action::rowcols
const int * rowcols
Definition: CoinPresolveUseless.hpp:14
useless_constraint_action::action
Definition: CoinPresolveUseless.hpp:11
useless_constraint_action::action::rlo
double rlo
Definition: CoinPresolveUseless.hpp:12
useless_constraint_action::action::row
int row
Definition: CoinPresolveUseless.hpp:16
useless_constraint_action::action::rowels
const double * rowels
Definition: CoinPresolveUseless.hpp:15
CoinPresolveAction
Abstract base class of all presolve routines.
Definition: CoinPresolveMatrix.hpp:163
useless_constraint_action::presolve
static const CoinPresolveAction * presolve(CoinPresolveMatrix *prob, const int *useless_rows, int nuseless_rows, const CoinPresolveAction *next)
useless_constraint_action::name
const char * name() const
A name for debug printing.
useless_constraint_action::testRedundant
const CoinPresolveAction * testRedundant(CoinPresolveMatrix *prob, const CoinPresolveAction *next)
Scan constraints looking for useless constraints.
useless_constraint_action::actions_
const action *const actions_
Definition: CoinPresolveUseless.hpp:21
useless_constraint_action
Definition: CoinPresolveUseless.hpp:10
useless_constraint_action::action::rup
double rup
Definition: CoinPresolveUseless.hpp:13
useless_constraint_action::useless_constraint_action
useless_constraint_action(int nactions, const action *actions, const CoinPresolveAction *next)
CoinPresolveAction::next
const CoinPresolveAction * next
The next presolve transformation.
Definition: CoinPresolveMatrix.hpp:180
CoinPostsolveMatrix
Augments CoinPrePostsolveMatrix with information about the problem that is only needed during postsol...
Definition: CoinPresolveMatrix.hpp:1552
CoinPresolveMatrix
Augments CoinPrePostsolveMatrix with information about the problem that is only needed during presolv...
Definition: CoinPresolveMatrix.hpp:905
useless_constraint_action::action::ninrow
int ninrow
Definition: CoinPresolveUseless.hpp:17
useless_constraint_action::~useless_constraint_action
virtual ~useless_constraint_action()