org.apache.commons.math.ode
Class MultistepIntegrator.NordsieckInitializer

java.lang.Object
  extended by org.apache.commons.math.ode.MultistepIntegrator.NordsieckInitializer
All Implemented Interfaces:
StepHandler
Enclosing class:
MultistepIntegrator

private class MultistepIntegrator.NordsieckInitializer
extends java.lang.Object
implements StepHandler

Specialized step handler storing the first step.


Field Summary
private  int n
          Problem dimension.
 
Constructor Summary
MultistepIntegrator.NordsieckInitializer(int n)
          Simple constructor.
 
Method Summary
 void handleStep(StepInterpolator interpolator, boolean isLast)
          Handle the last accepted step
 boolean requiresDenseOutput()
          Determines whether this handler needs dense output.
 void reset()
          Reset the step handler.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

n

private final int n
Problem dimension.

Constructor Detail

MultistepIntegrator.NordsieckInitializer

public MultistepIntegrator.NordsieckInitializer(int n)
Simple constructor.

Parameters:
n - problem dimension
Method Detail

handleStep

public void handleStep(StepInterpolator interpolator,
                       boolean isLast)
                throws DerivativeException
Handle the last accepted step

Specified by:
handleStep in interface StepHandler
Parameters:
interpolator - interpolator for the last accepted step. For efficiency purposes, the various integrators reuse the same object on each call, so if the instance wants to keep it across all calls (for example to provide at the end of the integration a continuous model valid throughout the integration range, as the ContinuousOutputModel class does), it should build a local copy using the clone method of the interpolator and store this copy. Keeping only a reference to the interpolator and reusing it will result in unpredictable behaviour (potentially crashing the application).
isLast - true if the step is the last one
Throws:
DerivativeException - this exception is propagated to the caller if the underlying user function triggers one

requiresDenseOutput

public boolean requiresDenseOutput()
Determines whether this handler needs dense output.

This method allows the integrator to avoid performing extra computation if the handler does not need dense output. If this method returns false, the integrator will call the StepHandler.handleStep(org.apache.commons.math.ode.sampling.StepInterpolator, boolean) method with a DummyStepInterpolator rather than a custom interpolator.

Specified by:
requiresDenseOutput in interface StepHandler
Returns:
true if the handler needs dense output

reset

public void reset()
Reset the step handler. Initialize the internal data as required before the first step is handled.

Specified by:
reset in interface StepHandler


Copyright (c) 2003-2010 Apache Software Foundation