org.opensourcephysics.numerics

クラス ODEBisectionEventSolver

java.lang.Object

org.opensourcephysics.numerics.ODEBisectionEventSolver

すべての実装されたインタフェース:

ODEAdaptiveSolver, ODEEventSolver, ODESolver

public class ODEBisectionEventSolver
extends java.lang.Object
implements ODEEventSolver, ODEAdaptiveSolver

ODEBisectionEventSolver is an ODEEventSolver that uses the bisection method for root finding.

作成者:

Francisco Esquembre (March 2004)

フィールドのサマリー

フィールド

修飾子とタイプ	フィールドと説明
static int	MAX Maximum number of bisections allowed

インタフェースから継承されたフィールド org.opensourcephysics.numerics.ODEAdaptiveSolver

BISECTION_EVENT_NOT_FOUND, DID_NOT_CONVERGE, NO_ERROR

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
ODEBisectionEventSolver(ODE ode, java.lang.Class<?> solverClass) Creates a new solver that uses the bisection method for finding the events.

メソッドのサマリー

メソッド

修飾子とタイプ	メソッドと説明
void	addEvent(StateEvent event) Adds a StateEvent to the list of events
int	getErrorCode() Gets the error code.
boolean	getEventHappened() Gets the eventHappend flag.
double	getStepSize() Gets the step size.
double	getTolerance() Gets the tolerance of the adaptive ODE sovler.
void	initialize(double stepSize) Initializes the ODE solver.
void	removeEvent(StateEvent event) Removes a StateEvent from the list of events
void	setStepSize(double stepSize) Sets the initial step size.
void	setTolerance(double tol) Sets the tolerance of the adaptive ODE sovler.
double	step() Advances the ODE as usual, except if an event takes place.

クラスから継承されたメソッド java.lang.Object

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

フィールドの詳細

MAX

public static final int MAX

Maximum number of bisections allowed

関連項目:

定数フィールド値

コンストラクタの詳細

ODEBisectionEventSolver

public ODEBisectionEventSolver(ODE ode,
                       java.lang.Class<?> solverClass)

Creates a new solver that uses the bisection method for finding the events. Example of use: solver = new BisectionEventSolver (anOde,org.opensourcephysics.numerics.RK4.class); solver.addEvent(aStateEvent); // for the rest it works as any other ODESolver. Tested status: Tested with fixed step solvers. Tested with adaptive algorithms. Tested with interpolation algorithms. (See the checks for ODEInterpolationSolver!) Thought it could probably be improved a bit by changing initialize() to a (non-yet-existing) synchronize()... Performance is quite good in examples, though. Fails with Zeno-type problems (as most others :-)

パラメータ:

ode - The ode to solve

solverClass - The ODESolver class to use.

メソッドの詳細

addEvent

public void addEvent(StateEvent event)

Adds a StateEvent to the list of events

定義:

addEvent インタフェース内 ODEEventSolver

パラメータ:

event - The event to be added

removeEvent

public void removeEvent(StateEvent event)

Removes a StateEvent from the list of events

定義:

removeEvent インタフェース内 ODEEventSolver

パラメータ:

event - The event to be removed

initialize

public void initialize(double stepSize)

インタフェースからコピーされた説明: ODESolver

Initializes the ODE solver. ODE solvers use this method to allocate temporary arrays that may be required to carry out the solution. The number of differential equations is determined by invoking getState().length on the ODE.

定義:

initialize インタフェース内 ODESolver

setStepSize

public void setStepSize(double stepSize)

インタフェースからコピーされた説明: ODESolver

Sets the initial step size. The step size may change if the ODE solver implements an adaptive step size algorithm such as RK4/5.

定義:

setStepSize インタフェース内 ODESolver

getStepSize

public double getStepSize()

インタフェースからコピーされた説明: ODESolver

Gets the step size.

定義:

getStepSize インタフェース内 ODESolver

戻り値:

the step size

setTolerance

public void setTolerance(double tol)

インタフェースからコピーされた説明: ODEAdaptiveSolver

Sets the tolerance of the adaptive ODE sovler.

定義:

setTolerance インタフェース内 ODEAdaptiveSolver

パラメータ:

tol - the tolerance

getTolerance

public double getTolerance()

インタフェースからコピーされた説明: ODEAdaptiveSolver

Gets the tolerance of the adaptive ODE sovler.

定義:

getTolerance インタフェース内 ODEAdaptiveSolver

戻り値:

getEventHappened

public boolean getEventHappened()

Gets the eventHappend flag. The falg is true if an event occured during the last step.

戻り値:

boolean

step

public double step()

Advances the ODE as usual, except if an event takes place. Then it finds the event point and applies the actions

定義:

step インタフェース内 ODESolver

戻り値:

The actual step taken

getErrorCode

public int getErrorCode()

Gets the error code. Error codes: ODEAdaptiveSolver.NO_ERROR ODEAdaptiveSolver.DID_NOT_CONVERGE ODEAdaptiveSolver.BISECTION_EVENT_NOT_FOUND=2;

定義:

getErrorCode インタフェース内 ODEAdaptiveSolver

戻り値:

int