org.apache.commons.math3.ode
Class MultistepIntegrator.NordsieckInitializer

java.lang.Object
  org.apache.commons.math3.ode.MultistepIntegrator.NordsieckInitializer

All Implemented Interfaces:

StepHandler

Enclosing class:

MultistepIntegrator

private class MultistepIntegrator.NordsieckInitializer
extends Object
implements StepHandler

Specialized step handler storing the first step.

Field Summary

private int	count Steps counter.
private double[]	t First steps times.
private double[][]	y First steps states.
private double[][]	yDot First steps derivatives.

Constructor Summary

MultistepIntegrator.NordsieckInitializer(int nSteps, int n)
Simple constructor.

Method Summary

void	handleStep(StepInterpolator interpolator, boolean isLast) Handle the last accepted step
void	init(double t0, double[] y0, double time) Initialize step handler at the start of an ODE integration.

Methods inherited from class java.lang.Object

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

Field Detail

count

private int count

Steps counter.

t

private final double[] t

First steps times.

y

private final double[][] y

First steps states.

yDot

private final double[][] yDot

First steps derivatives.

Constructor Detail

MultistepIntegrator.NordsieckInitializer

public MultistepIntegrator.NordsieckInitializer(int nSteps,
                                                int n)

Simple constructor.

Parameters:

nSteps - number of steps of the multistep method (excluding the one being computed)

n - problem dimension

Method Detail

handleStep

public void handleStep(StepInterpolator interpolator,
                       boolean isLast)
                throws MaxCountExceededException

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 behavior (potentially crashing the application).

isLast - true if the step is the last one

Throws:

MaxCountExceededException - if the interpolator throws one because the number of functions evaluations is exceeded

init

public void init(double t0,
                 double[] y0,
                 double time)

Initialize step handler at the start of an ODE integration.

This method is called once at the start of the integration. It may be used by the step handler to initialize some internal data if needed.

Specified by:

init in interface StepHandler

Parameters:

t0 - start value of the independent time variable

y0 - array containing the start value of the state vector

time - target time for the integration