nl.tudelft.simulation.jstats.ode
Class DifferentialEquation

java.lang.Object
  nl.tudelft.simulation.event.EventProducer
      nl.tudelft.simulation.jstats.ode.DifferentialEquation

All Implemented Interfaces:

Serializable, EventProducerInterface, DifferentialEquationInterface

public abstract class DifferentialEquation
extends EventProducer
implements DifferentialEquationInterface

The DifferentialEquation is the abstract basis for

(c) copyright 2002-2005 Delft University of Technology , the Netherlands.
See for project information www.simulation.tudelft.nl
License of use: Lesser General Public License (LGPL) , no warranty.

Since:

1.4

Version:

$Revision: 1.1 $ $Date: 2007/01/06 13:25:44 $

Author:

Peter Jacobs

See Also:

Serialized Form

Field Summary

protected double	timeStep a timeStep
protected double	x0 the first x value to start integration
protected double[]	y0 the initial value array

Fields inherited from class nl.tudelft.simulation.event.EventProducer

listeners

Fields inherited from interface nl.tudelft.simulation.event.EventProducerInterface

FIRST_POSITION, LAST_POSITION

Constructor Summary

DifferentialEquation(double timeStep)
constructs a new DifferentialEquation with default integrator.

DifferentialEquation(double timeStep, NumericalIntegrator integrator)
constructs a new DifferentialEquation with a user-specified integrator.

DifferentialEquation(double timeStep, short integrationMethod)
constructs a new DifferentialEquation with a preselected integrator.

Method Summary

NumericalIntegrator	getIntegrator()
void	initialize(double x, double[] y) initializes the differential equation
protected double[]	integrateY(double x, double initialX, double[] initialY) integrates Y
void	setIntegrator(NumericalIntegrator integrator)
double[]	y(double x) returns y as a function of x

Methods inherited from class nl.tudelft.simulation.event.EventProducer

addListener, addListener, addListener, addListener, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, fireEvent, getEventTypes, removeAllListeners, removeAllListeners, removeListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface nl.tudelft.simulation.jstats.ode.DifferentialEquationInterface

dy

Field Detail

y0

protected double[] y0

the initial value array

timeStep

protected double timeStep

a timeStep

x0

protected double x0

the first x value to start integration

Constructor Detail

DifferentialEquation

public DifferentialEquation(double timeStep)

constructs a new DifferentialEquation with default integrator.

Parameters:

timeStep - the timeStep to use.

DifferentialEquation

public DifferentialEquation(double timeStep,
                            NumericalIntegrator integrator)

constructs a new DifferentialEquation with a user-specified integrator.

Parameters:

timeStep - the timeStep to use.

integrator - the integrator to use.

DifferentialEquation

public DifferentialEquation(double timeStep,
                            short integrationMethod)

constructs a new DifferentialEquation with a preselected integrator.

Parameters:

timeStep - the timeStep to use.

integrationMethod - the integrator to use.

Method Detail

initialize

public void initialize(double x,
                       double[] y)

Description copied from interface: DifferentialEquationInterface

initializes the differential equation

Specified by:

initialize in interface DifferentialEquationInterface

Parameters:

x - the x-value

y - the y-value

See Also:

DifferentialEquationInterface.initialize(double, double[])

y

public double[] y(double x)

Description copied from interface: DifferentialEquationInterface

returns y as a function of x

Specified by:

y in interface DifferentialEquationInterface

Parameters:

x - the x-value

Returns:

y

See Also:

DifferentialEquationInterface.y(double)

integrateY

protected double[] integrateY(double x,
                              double initialX,
                              double[] initialY)

integrates Y

Parameters:

x - the x-value

initialX - the initial X value

initialY - the initial Y value

Returns:

the new Y value

getIntegrator

public NumericalIntegrator getIntegrator()

Returns:

Returns the integrator.

setIntegrator

public void setIntegrator(NumericalIntegrator integrator)

Parameters:

integrator - The integrator to set.