public interface FirstOrderDifferentialEquations
This interface should be implemented by all real first order
differential equation problems before they can be handled by the
FirstOrderIntegrator.integrate(org.apache.commons.math.ode.FirstOrderDifferentialEquations, double, double, double, double) method.
A first order differential equations problem, as seen by an
integrator is the time derivative
dY/dt of a state
Y, both being one dimensional arrays. From the
integrator point of view, this derivative depends only on the
t and on 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.
void computeDerivatives(double t, double y, double yDot) throws DerivativeException
t- current value of the independent time variable
y- array containing the current value of the state vector
yDot- placeholder array where to put the time derivative of the state vector
DerivativeException- this user-defined exception should be used if an error is is triggered by user code
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