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

java.lang.Object
  org.apache.commons.math.ode.MultistepIntegrator.CountingDifferentialEquations

All Implemented Interfaces:

FirstOrderDifferentialEquations

Enclosing class:

MultistepIntegrator

private class MultistepIntegrator.CountingDifferentialEquations
extends Object
implements FirstOrderDifferentialEquations

Wrapper for differential equations, ensuring start evaluations are counted.

Field Summary

private int

dimension Dimension of the problem.

Constructor Summary

MultistepIntegrator.CountingDifferentialEquations(int dimension)
Simple constructor.

Method Summary

void	computeDerivatives(double t, double[] y, double[] dot) Get the current time derivative of the state vector.
int	getDimension() Get the dimension of the problem.

Methods inherited from class java.lang.Object

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

Field Detail

dimension

private final int dimension

Dimension of the problem.

Constructor Detail

MultistepIntegrator.CountingDifferentialEquations

public MultistepIntegrator.CountingDifferentialEquations(int dimension)

Simple constructor.

Parameters:

dimension - dimension of the problem

Method Detail

computeDerivatives

public void computeDerivatives(double t,
                               double[] y,
                               double[] dot)
                        throws DerivativeException

Get the current time derivative of the state vector.

Specified by:

computeDerivatives in interface FirstOrderDifferentialEquations

Parameters:

t - current value of the independent time variable

y - array containing the current value of the state vector

dot - placeholder array where to put the time derivative of the state vector

Throws:

DerivativeException - this exception is propagated to the caller if the underlying user function triggers one

getDimension

public int getDimension()

Get the dimension of the problem.

Specified by:

getDimension in interface FirstOrderDifferentialEquations

Returns:

dimension of the problem