Package org.hipparchus.migration.ode

Interface FirstOrderDifferentialEquations

All Superinterfaces:

OrdinaryDifferentialEquation

@Deprecated
public interface FirstOrderDifferentialEquations
extends OrdinaryDifferentialEquation

Deprecated.

as of 1.0, replaced with OrdinaryDifferentialEquation

This interface represents a first order differential equations set.

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.

See Also:

• ODEIntegrator
• FirstOrderConverter
• SecondOrderDifferentialEquations

Method Summary

Modifier and Type	Method	Description
default double[]	computeDerivatives(double t, double[] y)	Deprecated.
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.

The default implementation calls computeDerivatives(double, double[], double[]).

Specified by:

computeDerivatives in interface OrdinaryDifferentialEquation

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 variable

y - array containing the current value of the state vector

yDot - placeholder array where to put the time derivative of the state vector

Throws:

MathIllegalStateException - if the number of functions evaluations is exceeded

MathIllegalArgumentException - if arrays dimensions do not match equations settings