ilog.cplex

Class IloCplex.Algorithm

java.lang.Object

ilog.cplex.IloCplex.Algorithm

Enclosing class:

IloCplex

public static class IloCplex.Algorithm
extends java.lang.Object

Enumeration of types of algorithms (algorithm-type) used by IloCplex.

Use these algorithm-types with the parameters IloCplex.IntParam.RootAlg, and IloCplex.IntParam.NodeAlg, to specify which algorithm to apply during branch-and-cut search. In the case of IloCplex.IntParam.RootAlg, the algorithm-type specifies the algorithm that solves the root relaxation. In the case of IloCplex.IntParam.NodeAlg, the algorithm-type specifies the algorithm that solves the problems at other nodes. These parameters can be set with the method IloCplex.setParam.

These algorithm-types are also returned by IloCplex.getAlgorithm to report the algorithm that was used to generate the current solution.

Field Summary

Fields

Modifier and Type	Field and Description
static int	Auto Allows IloCplex to select an algorithm.
static int	Barrier Selects the barrier algorithm.
static int	Concurrent Selects the concurrent optimizer.
static int	Dual Selects the dual simplex algorithm.
static int	FeasOpt This value may not be used to select an optimizer but is returned by IloCplex.getAlgorithm when the method feasOpt has generated the current solution.
static int	MIP This value may not be used to select an optimizer but is returned by IloCplex.getAlgorithm when the mixed integer optimizer has generated the current solution.
static int	Network Selects the network simplex algorithm.
static int	None Selects no algorithm.
static int	Primal Selects the primal simplex algorithm.
static int	Sifting Selects the sifting algorithm.

Constructor Summary

Constructors

Constructor and Description
IloCplex.Algorithm()

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

None

public static final int None

Selects no algorithm.

This algorithm-type is available only to specify the crossover algorithm to use after an LP or QP is solved with the barrier method. If you select IloCplex.Algorithm.None as the crossover algorithm for the barrier method (parameter IloCplex.IntParam.BarCrossAlg), no crossover to a simplex solution is performed after the barrier optimization.

See Also:

Constant Field Values

Auto

public static final int Auto

Allows IloCplex to select an algorithm.

This algorithm choice instructs the IloCplex optimizer to select the most suitable or default optimizer for solving LPs, QCPs, or QPs.

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Constant Field Values

Primal

public static final int Primal

Selects the primal simplex algorithm.

This algorithm-type instructs the IloCplex optimizer to use the primal simplex method for solving LPs or QPs.

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Constant Field Values

Dual

public static final int Dual

Selects the dual simplex algorithm.

This algorithm-type instructs the IloCplex optimizer to use the dual simplex method for solving LPs or QPs.

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Constant Field Values

Network

public static final int Network

Selects the network simplex algorithm.

This algorithm-type instructs the IloCplex optimizer to use the network simplex method on the embedded network for solving LPs or QPs and to continue with a simplex method.

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Constant Field Values

Barrier

public static final int Barrier

Selects the barrier algorithm.

This algorithm-type instructs the IloCplex optimizer to use the barrier optimizer to solve an LP, QCP, or QP. When solving an LP or QP, the optimizer performs a crossover to a simplex solution unless the parameter IloCplex.IntParam.BarCrossAlg is set to IloCplex.Algorithm.None.

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Constant Field Values

Sifting

public static final int Sifting

Selects the sifting algorithm.

This algorithm-type instructs the IloCplex optimizer to use the sifting optimizer to solve LP problems. The sifting optimizer is available only for LPs; other attempts to use this choice will automatically revert to Auto.

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Constant Field Values

Concurrent

public static final int Concurrent

Selects the concurrent optimizer.

This algorithm-type instructs the IloCplex optimizer to use several algorithm options concurrently.

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Constant Field Values

FeasOpt

public static final int FeasOpt

This value may not be used to select an optimizer but is returned by IloCplex.getAlgorithm when the method feasOpt has generated the current solution.

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Constant Field Values

MIP

public static final int MIP

This value may not be used to select an optimizer but is returned by IloCplex.getAlgorithm when the mixed integer optimizer has generated the current solution.

See Also:

Constant Field Values

Constructor Detail

IloCplex.Algorithm

public IloCplex.Algorithm()