ilog.cplex
Class IloCplex.LPCallback

java.lang.Object
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  +--ilog.cplex.IloCplex.Callback
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        +--ilog.cplex.IloCplex.LPCallback

Direct Known Subclasses:

IloCplex.BarrierCallback, IloCplex.DualSimplexCallback, IloCplex.PrimalSimplexCallback

public abstract static class IloCplex.LPCallback

extends IloCplex.Callback

The LP callback class for user-written callbacks. LP callbacks are executed at every iteration during the solution of an LP with the dual simplex algorith, the primal simplex algorithm or the barrier algorithm. Callbacks that are only effective with a specific algorithm are also available as classes IloCplex.DualSimplexCallback, IloCplex.PrimalSimplexCallback, and IloCplex.BarrierCallback.

See Also:

IloCplex.Callback, IloCplex.DualSimplexCallback, IloCplex.PrimalSimplexCallback, IloCplex.BarrierCallback

Constructor Summary

protected	IloCplex.LPCallback() The user-written callback constructor.
protected	IloCplex.LPCallback(int type)

Method Summary

protected double	getDualInfeasibility() Gets a measure for the dual infeasibility of the current solution.
protected double	getInfeasibility() Gets a measure for the primal infeasibility of the current solution.
protected int	getNiterations() Gets the number of iterations performed so far.
protected double	getObjValue() Gets the current objective value.
protected boolean	isDualFeasible() Gets a boolean indicating whether the current solution is dual feasible.
protected boolean	isFeasible() Gets a boolean indicating whether the current solution is primal feasible.

Methods inherited from class ilog.cplex.IloCplex.Callback

abort, main

Methods inherited from class java.lang.Object

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

Constructor Detail

IloCplex.LPCallback

protected IloCplex.LPCallback(int type)

IloCplex.LPCallback

protected IloCplex.LPCallback()

The user-written callback constructor. This constructor can be called only for constructing objects of derived user-written callback classes, not to construct IloCplex.LPCallback objects directly.

Method Detail

getObjValue

protected double getObjValue()

Gets the current objective value. The current objective value is the objective value at the point when the callback is called. In the simplex method, this objective value may not apply to the objective function defined for the model being solved, but an artificial phase 1 objective function used to achieve primal or dual feasibility. In the barrier method, where the objective functions can be computed using dual or primal vectors and both definitions are not equivalent (unless optimality is achieved), the primal objective function is returned.

Returns:

The current objective value.

getInfeasibility

protected double getInfeasibility()

Gets a measure for the primal infeasibility of the current solution. If the current solution is feasible 0 will be returned. Otherwise a positive value will be returned.

Returns:

A measure for the primal infeasibility of the current solution.

getDualInfeasibility

protected double getDualInfeasibility()

Gets a measure for the dual infeasibility of the current solution. If the current solution is feasible 0 will be returned. Otherwise a positive value will be returned.

Returns:

A measure for the dual infeasibility of the current solution.

isFeasible

protected boolean isFeasible()

Gets a boolean indicating whether the current solution is primal feasible.

Returns:

A boolean indicating whether the current solution is primal feasible.

isDualFeasible

protected boolean isDualFeasible()

Gets a boolean indicating whether the current solution is dual feasible.

Returns:

A boolean indicating whether the current solution is dual feasible.

getNiterations

protected int getNiterations()

Gets the number of iterations performed so far.

Returns:

The number of iterations performed so far.