Package org.apache.commons.math.ode.sampling

Class DummyStepInterpolator

java.lang.Object

org.apache.commons.math.ode.sampling.AbstractStepInterpolator

org.apache.commons.math.ode.sampling.DummyStepInterpolator

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, StepInterpolator

public class DummyStepInterpolator
extends AbstractStepInterpolator

This class is a step interpolator that does nothing.

This class is used when the "step handler" set up by the user does not need step interpolation. It does not recompute the state when setInterpolatedTime is called. This implies the interpolated state is always the state at the end of the current step.

Since:

1.2

Version:

$Revision: 1037327 $ $Date: 2010-11-20 21:57:37 +0100 (sam. 20 nov. 2010) $

See Also:

StepHandler, Serialized Form

Field Summary

Fields inherited from class org.apache.commons.math.ode.sampling.AbstractStepInterpolator

currentState, h, interpolatedDerivatives, interpolatedState, interpolatedTime

Constructor Summary

Constructors

Constructor	Description
DummyStepInterpolator()	Simple constructor.
DummyStepInterpolator(double[] y, double[] yDot, boolean forward)	Simple constructor.
DummyStepInterpolator(DummyStepInterpolator interpolator)	Copy constructor.

Method Summary

Modifier and Type	Method	Description
protected void	computeInterpolatedStateAndDerivatives(double theta, double oneMinusThetaH)	Compute the state at the interpolated time.
protected StepInterpolator	doCopy()	Really copy the finalized instance.
void	readExternal(java.io.ObjectInput in)	Read the instance from an input channel.
void	writeExternal(java.io.ObjectOutput out)	Write the instance to an output channel.

Methods inherited from class org.apache.commons.math.ode.sampling.AbstractStepInterpolator

copy, doFinalize, finalizeStep, getCurrentTime, getGlobalCurrentTime, getGlobalPreviousTime, getInterpolatedDerivatives, getInterpolatedState, getInterpolatedTime, getPreviousTime, isForward, readBaseExternal, reinitialize, setInterpolatedTime, setSoftCurrentTime, setSoftPreviousTime, shift, storeTime, writeBaseExternal

Methods inherited from class java.lang.Object

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

Constructor Detail

DummyStepInterpolator

public DummyStepInterpolator()

Simple constructor. This constructor builds an instance that is not usable yet, the AbstractStepInterpolator.reinitialize protected method should be called before using the instance in order to initialize the internal arrays. This constructor is used only in order to delay the initialization in some cases. As an example, the EmbeddedRungeKuttaIntegrator uses the prototyping design pattern to create the step interpolators by cloning an uninitialized model and latter initializing the copy.

DummyStepInterpolator

public DummyStepInterpolator(double[] y,
                             double[] yDot,
                             boolean forward)

Simple constructor.

Parameters:

y - reference to the integrator array holding the state at the end of the step

yDot - reference to the integrator array holding the state derivative at some arbitrary point within the step

forward - integration direction indicator

DummyStepInterpolator

public DummyStepInterpolator(DummyStepInterpolator interpolator)

Copy constructor.

Parameters:

interpolator - interpolator to copy from. The copy is a deep copy: its arrays are separated from the original arrays of the instance

Method Detail

doCopy

protected StepInterpolator doCopy()

Really copy the finalized instance.

Specified by:

doCopy in class AbstractStepInterpolator

Returns:

a copy of the finalized instance

computeInterpolatedStateAndDerivatives

protected void computeInterpolatedStateAndDerivatives(double theta,
                                                      double oneMinusThetaH)

Compute the state at the interpolated time. In this class, this method does nothing: the interpolated state is always the state at the end of the current step.

Specified by:

computeInterpolatedStateAndDerivatives in class AbstractStepInterpolator

Parameters:

theta - normalized interpolation abscissa within the step (theta is zero at the previous time step and one at the current time step)

oneMinusThetaH - time gap between the interpolated time and the current time

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Write the instance to an output channel.

Specified by:

writeExternal in interface java.io.Externalizable

Specified by:

writeExternal in class AbstractStepInterpolator

Parameters:

out - output channel

Throws:

java.io.IOException - if the instance cannot be written

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException

Read the instance from an input channel.

Specified by:

readExternal in interface java.io.Externalizable

Specified by:

readExternal in class AbstractStepInterpolator

Parameters:

in - input channel

Throws:

java.io.IOException - if the instance cannot be read