public interface SecondOrderDifferentialEquations
This interface should be implemented by all real second order
 differential equation problems before they can be handled by the
 integrators SecondOrderIntegrator.integrate(org.apache.commons.math3.ode.SecondOrderDifferentialEquations, double, double[], double[], double, double[], double[]) method.
A second order differential equations problem, as seen by an
 integrator is the second time derivative d2Y/dt^2 of a
 state vector Y, both being one dimensional
 arrays. From the integrator point of view, this derivative depends
 only on the current time t, on the state vector
 Y and on the first time derivative of the state
 vector.
For real problems, the derivative depends also on parameters that do not belong to the state vector (dynamical model constants for example). These constants are completely outside of the scope of this interface, the classes that implement it are allowed to handle them as they want.
SecondOrderIntegrator, 
FirstOrderConverter, 
FirstOrderDifferentialEquations| Modifier and Type | Method and Description | 
|---|---|
| void | computeSecondDerivatives(double t,
                        double[] y,
                        double[] yDot,
                        double[] yDDot)Get the current time derivative of the state vector. | 
| int | getDimension()Get the dimension of the problem. | 
int getDimension()
void computeSecondDerivatives(double t,
                            double[] y,
                            double[] yDot,
                            double[] yDDot)
t - current value of the independent time variabley - array containing the current value of the state vectoryDot - array containing the current value of the first derivative
 of the state vectoryDDot - placeholder array where to put the second time derivative
 of the state vectorCopyright © 2003–2016 The Apache Software Foundation. All rights reserved.