Interface FirstOrderDifferentialEquations
 All Superinterfaces:
OrdinaryDifferentialEquation
This interface should be implemented by all real first order
differential equation problems before they can be handled by the
integrators ODEIntegrator.integrate(org.hipparchus.ode.ExpandableODE, org.hipparchus.ode.ODEState, double)
method.
A first order differential equations problem, as seen by an
integrator is the time derivative dY/dt
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
and on the state vector
Y
.
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.

Method Summary
Modifier and TypeMethodDescriptiondefault double[]
computeDerivatives
(double t, double[] y) Deprecated.Get the current time derivative of the state vector.void
computeDerivatives
(double t, double[] y, double[] yDot) Deprecated.Get the current time derivative of the state vector.Methods inherited from interface org.hipparchus.ode.OrdinaryDifferentialEquation
getDimension, init

Method Details

computeDerivatives
default double[] computeDerivatives(double t, double[] y) Deprecated.Get the current time derivative of the state vector.The default implementation calls
computeDerivatives(double, double[], double[])
. Specified by:
computeDerivatives
in interfaceOrdinaryDifferentialEquation
 Parameters:
t
 current value of the independent time variabley
 array containing the current value of the state vector Returns:
 time derivative of the state vector

computeDerivatives
void computeDerivatives(double t, double[] y, double[] yDot) throws MathIllegalArgumentException, MathIllegalStateException Deprecated.Get the current time derivative of the state vector. Parameters:
t
 current value of the independent time variabley
 array containing the current value of the state vectoryDot
 placeholder array where to put the time derivative of the state vector Throws:
MathIllegalStateException
 if the number of functions evaluations is exceededMathIllegalArgumentException
 if arrays dimensions do not match equations settings

OrdinaryDifferentialEquation