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public interface SecondOrderDifferentialEquations
This interface represents a second order differential equations set.
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.math.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
Method Summary  

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. 
Method Detail 

int getDimension()
void computeSecondDerivatives(double t, double[] y, double[] yDot, double[] yDDot) throws DerivativeException
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 vector
DerivativeException
 this userdefined exception should be used if an error is
is triggered by user code


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