Package org.hipparchus.ode.nonstiff.interpolators

Class RungeKuttaStateInterpolator

java.lang.Object

org.hipparchus.ode.sampling.AbstractODEStateInterpolator

org.hipparchus.ode.nonstiff.interpolators.RungeKuttaStateInterpolator

All Implemented Interfaces:

Serializable, ODEStateInterpolator

Direct Known Subclasses:

ClassicalRungeKuttaStateInterpolator, DormandPrince54StateInterpolator, DormandPrince853StateInterpolator, EulerStateInterpolator, GillStateInterpolator, HighamHall54StateInterpolator, LutherStateInterpolator, MidpointStateInterpolator, ThreeEighthesStateInterpolator

public abstract class RungeKuttaStateInterpolator
extends AbstractODEStateInterpolator

This class represents an interpolator over the last step during an ODE integration for Runge-Kutta and embedded Runge-Kutta integrators.

See Also:

• FixedStepRungeKuttaIntegrator
• EmbeddedRungeKuttaIntegrator
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected double[][]	yDotK	Slopes at the intermediate points

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RungeKuttaStateInterpolator(boolean forward, double[][] yDotK, ODEStateAndDerivative globalPreviousState, ODEStateAndDerivative globalCurrentState, ODEStateAndDerivative softPreviousState, ODEStateAndDerivative softCurrentState, EquationsMapper mapper)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
protected abstract RungeKuttaStateInterpolator	create(boolean newForward, double[][] newYDotK, ODEStateAndDerivative newGlobalPreviousState, ODEStateAndDerivative newGlobalCurrentState, ODEStateAndDerivative newSoftPreviousState, ODEStateAndDerivative newSoftCurrentState, EquationsMapper newMapper)	Create a new instance.
protected RungeKuttaStateInterpolator	create(boolean newForward, ODEStateAndDerivative newGlobalPreviousState, ODEStateAndDerivative newGlobalCurrentState, ODEStateAndDerivative newSoftPreviousState, ODEStateAndDerivative newSoftCurrentState, EquationsMapper newMapper)	Create a new instance.
protected double[]	currentStateLinearCombination(double... coefficients)	Compute a state by linear combination added to current state.
protected double[]	derivativeLinearCombination(double... coefficients)	Compute a state derivative by linear combination.
protected final double[]	previousStateLinearCombination(double... coefficients)	Compute a state by linear combination added to previous state.

Methods inherited from class org.hipparchus.ode.sampling.AbstractODEStateInterpolator

computeInterpolatedStateAndDerivatives, getCurrentState, getGlobalCurrentState, getGlobalPreviousState, getInterpolatedState, getMapper, getPreviousState, isCurrentStateInterpolated, isForward, isPreviousStateInterpolated, restrictStep

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

yDotK

protected double[][] yDotK

Slopes at the intermediate points

Constructor Details

RungeKuttaStateInterpolator

protected RungeKuttaStateInterpolator(boolean forward,
 double[][] yDotK,
 ODEStateAndDerivative globalPreviousState,
 ODEStateAndDerivative globalCurrentState,
 ODEStateAndDerivative softPreviousState,
 ODEStateAndDerivative softCurrentState,
 EquationsMapper mapper)

Simple constructor.

Parameters:

forward - integration direction indicator

yDotK - slopes at the intermediate points

globalPreviousState - start of the global step

globalCurrentState - end of the global step

softPreviousState - start of the restricted step

softCurrentState - end of the restricted step

mapper - equations mapper for the all equations

Method Details

create

protected RungeKuttaStateInterpolator create(boolean newForward,
 ODEStateAndDerivative newGlobalPreviousState,
 ODEStateAndDerivative newGlobalCurrentState,
 ODEStateAndDerivative newSoftPreviousState,
 ODEStateAndDerivative newSoftCurrentState,
 EquationsMapper newMapper)

Create a new instance.

Specified by:

create in class AbstractODEStateInterpolator

Parameters:

newForward - integration direction indicator

newGlobalPreviousState - start of the global step

newGlobalCurrentState - end of the global step

newSoftPreviousState - start of the restricted step

newSoftCurrentState - end of the restricted step

newMapper - equations mapper for the all equations

Returns:

a new instance

create

protected abstract RungeKuttaStateInterpolator create(boolean newForward,
 double[][] newYDotK,
 ODEStateAndDerivative newGlobalPreviousState,
 ODEStateAndDerivative newGlobalCurrentState,
 ODEStateAndDerivative newSoftPreviousState,
 ODEStateAndDerivative newSoftCurrentState,
 EquationsMapper newMapper)

Create a new instance.

Parameters:

newForward - integration direction indicator

newYDotK - slopes at the intermediate points

newGlobalPreviousState - start of the global step

newGlobalCurrentState - end of the global step

newSoftPreviousState - start of the restricted step

newSoftCurrentState - end of the restricted step

newMapper - equations mapper for the all equations

Returns:

a new instance

previousStateLinearCombination

protected final double[] previousStateLinearCombination(double... coefficients)

Compute a state by linear combination added to previous state.

Parameters:

coefficients - coefficients to apply to the method staged derivatives

Returns:

combined state

currentStateLinearCombination

protected double[] currentStateLinearCombination(double... coefficients)

Compute a state by linear combination added to current state.

Parameters:

coefficients - coefficients to apply to the method staged derivatives

Returns:

combined state

derivativeLinearCombination

protected double[] derivativeLinearCombination(double... coefficients)

Compute a state derivative by linear combination.

Parameters:

coefficients - coefficients to apply to the method staged derivatives

Returns:

combined state