Fehlberg8

java.lang.Object

org.opensourcephysics.numerics.AbstractODESolver

org.opensourcephysics.numerics.Fehlberg8

All Implemented Interfaces:: ODESolver

Direct Known Subclasses:: Adams6

public class Fehlberg8 extends AbstractODESolver

Title: Fehlberg8 Description: An eigth order Runge-Kutta ODE solver.

Version:: 1.0
Author:: Wolfgang Christian & F. Esquembre

Field Summary

Fields inherited from class org.opensourcephysics.numerics.AbstractODESolver
numEqn, ode, stepSize
Constructor Summary

Constructors

Constructor

Description

Fehlberg8(ODE ode)

Constructs the RK4 ODESolver for a system of ordinary differential equations.
Method Summary

Modifier and Type

Method

Description

void

initialize(double stepSize)

Initializes the ODE solver and allocates the rate and state arrays.

double

step()

Steps (advances) the differential equations by the stepSize.

Methods inherited from class org.opensourcephysics.numerics.AbstractODESolver
getStepSize, setStepSize

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- Fehlberg8
  
  public Fehlberg8(ODE ode)
  
  Constructs the RK4 ODESolver for a system of ordinary differential equations.
  
  Parameters:
  
  ode - the system of differential equations.
Method Details
- initialize
  
  public void initialize(double stepSize)
  
  Initializes the ODE solver and allocates the rate and state arrays. The number of differential equations is determined by invoking getState().length on the superclass.
  
  Specified by:
  
  initialize in interface ODESolver
  
  Overrides:
  
  initialize in class AbstractODESolver
  
  Parameters:
  
  stepSize -
- step
  
  public double step()
  
  Steps (advances) the differential equations by the stepSize. The ODESolver invokes the ODE's getRate method to compute the rate at various intermediate states. The ODESolver then advances the solution and copies the new state into the ODE's state array at the end of the solution step.
  
  Specified by:
  
  step in interface ODESolver
  
  Specified by:
  
  step in class AbstractODESolver
  
  Returns:
  
  the step size