public interface SecondOrderDifferentialEquations
This interface should be implemented by all real second order
differential equation problems before they can be handled by the
SecondOrderIntegrator.integrate(org.apache.commons.math4.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
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
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.
void computeSecondDerivatives(double t, double y, double yDot, double yDDot)
t- current value of the independent time variable
y- array containing the current value of the state vector
yDot- array containing the current value of the first derivative of the state vector
yDDot- placeholder array where to put the second time derivative of the state vector
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