org.opensourcephysics.numerics
Interface ODE

All Known Implementing Classes:

ODEMultistepSolver.InternalODE

public interface ODE

ODE defines a system of differential equations by providing access to the rate equations.

Author:

Wolfgang Christian

Method Summary

void	getRate(double[] state, double[] rate) Gets the rate of change using the argument's state variables.
double[]	getState() Gets the state variables.

Method Detail

getState

double[] getState()

Gets the state variables. The getState method is invoked by an ODESolver to obtain the initial state of the system. The ODE solver advances the solution and then copies new values into the state array at the end of the solution step.

Returns:

state the state

getRate

void getRate(double[] state,
             double[] rate)

Gets the rate of change using the argument's state variables. This method may be invoked many times with different intermediate states as an ODESolver is carrying out the solution.

Parameters:

state - the state array

rate - the rate array