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doubleton_action Class Reference

Solve ax+by=c for y and substitute y out of the problem. More...

`#include <CoinPresolveDoubleton.hpp>`

Inheritance diagram for doubleton_action:
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Collaboration diagram for doubleton_action:
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## Classes
struct | 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 | ~doubleton_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 *, 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...

## Public Attributes
const int | nactions_
const action *const | actions_
Public Attributes inherited from CoinPresolveAction
const CoinPresolveAction * | next
| The next presolve transformation. More...

## Private Member Functions
| doubleton_action (int nactions, const action *actions, const CoinPresolveAction *next)

## Detailed Description

Solve ax+by=c for y and substitute y out of the problem.

This moves the bounds information for y onto x, making y free and allowing us to substitute it away.

             a x + b y = c
             l1 <= x <= u1
             l2 <= y <= u2  ==>

             l2 <= (c - a x) / b <= u2
             b/-a > 0 ==> (b l2 - c) / -a <= x <= (b u2 - c) / -a
             b/-a < 0 ==> (b u2 - c) / -a <= x <= (b l2 - c) / -a

Definition at line 26 of file CoinPresolveDoubleton.hpp.

## Constructor & Destructor Documentation

doubleton_action::doubleton_action | ( | int | nactions,
|  | const action * | actions,
|  | const CoinPresolveAction * | next
| ) |  |
| inline private

Definition at line 54 of file CoinPresolveDoubleton.hpp.

virtual doubleton_action::~doubleton_action | ( |  | ) |
| virtual

## Member Function Documentation

const char* doubleton_action::name | ( |  | ) | const
| inline virtual

A name for debug printing.

It is expected that the name is not stored in the transform itself.

Implements CoinPresolveAction.

Definition at line 64 of file CoinPresolveDoubleton.hpp.

static const CoinPresolveAction* doubleton_action::presolve | ( | CoinPresolveMatrix * | ,
|  | const CoinPresolveAction * | next
| ) |  |
| static

void doubleton_action::postsolve | ( | CoinPostsolveMatrix * | prob | ) | const
| virtual

Apply the postsolve transformation for this particular presolve action.

Implements CoinPresolveAction.

## Member Data Documentation

const int doubleton_action::nactions_

Definition at line 50 of file CoinPresolveDoubleton.hpp.

const action* const doubleton_action::actions_

Definition at line 51 of file CoinPresolveDoubleton.hpp.

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

- /tmp/Clp-1.17.6/CoinUtils/src/CoinPresolveDoubleton.hpp