Package org.opensourcephysics.numerics

Class Ralston2

java.lang.Object
org.opensourcephysics.numerics.AbstractODESolver
org.opensourcephysics.numerics.Ralston2
All Implemented Interfaces:
ODESolver
public class Ralston2 extends AbstractODESolver
Ralston2 implements Ralston's algorithm for solving ODEs by evaluating the rate at the initial state, estimating the rate for the final state, and using a weighted average of these two rates to advance the state.
Version:
1.0

  • Constructor Details

    • Ralston2

      public Ralston2(ODE ode)
      Constructor Ralston2
      Parameters:
      ode -

  • 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 getState method to obtain the initial state of the system. The ODESolver then uses this state estimate the rate a intermediate points. Finally, the ODESolver advances the solution and copies the new state into the 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