This interface should be implemented by all real second order
differential equation problems before they can be handled by the
integrators SecondOrderIntegrator#integrate 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 |
|---|---|
| public void | computeSecondDerivatives(double
current value of the independent time variable t, double[] array containing the current value of the state vector y, double[] array containing the current value of the first derivative
of the state vector yDot, double[] placeholder array where to put the second time derivative
of the state vector yDDot)Get the current time derivative of the state vector. |
| public int |
| computeSecondDerivatives | back to summary |
|---|---|
| public void computeSecondDerivatives(double t, double[] y, double[] yDot, double[] yDDot) Get the current time derivative of the state vector.
| |
| getDimension | back to summary |
|---|---|
| public int getDimension() Get the dimension of the problem.
| |