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java.lang.Objectorg.apache.commons.math.ode.AbstractStepInterpolator
org.apache.commons.math.ode.RungeKuttaStepInterpolator
org.apache.commons.math.ode.DormandPrince54StepInterpolator
class DormandPrince54StepInterpolator
This class represents an interpolator over the last step during an ODE integration for the 5(4) Dormand-Prince integrator.
DormandPrince54Integrator
Field Summary | |
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private static double |
a70
Last row of the Butcher-array internal weights, element 0. |
private static double |
a72
Last row of the Butcher-array internal weights, element 2. |
private static double |
a73
Last row of the Butcher-array internal weights, element 3. |
private static double |
a74
Last row of the Butcher-array internal weights, element 4. |
private static double |
a75
Last row of the Butcher-array internal weights, element 5. |
private static double |
d0
Shampine (1986) Dense output, element 0. |
private static double |
d2
Shampine (1986) Dense output, element 2. |
private static double |
d3
Shampine (1986) Dense output, element 3. |
private static double |
d4
Shampine (1986) Dense output, element 4. |
private static double |
d5
Shampine (1986) Dense output, element 5. |
private static double |
d6
Shampine (1986) Dense output, element 6. |
private static long |
serialVersionUID
Serializable version identifier |
private double[] |
v1
First vector for interpolation. |
private double[] |
v2
Second vector for interpolation. |
private double[] |
v3
Third vector for interpolation. |
private double[] |
v4
Fourth vector for interpolation. |
private boolean |
vectorsInitialized
Initialization indicator for the interpolation vectors. |
Fields inherited from class org.apache.commons.math.ode.RungeKuttaStepInterpolator |
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equations, yDotK |
Fields inherited from class org.apache.commons.math.ode.AbstractStepInterpolator |
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currentState, currentTime, h, interpolatedState, interpolatedTime, previousTime |
Constructor Summary | |
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DormandPrince54StepInterpolator()
Simple constructor. |
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DormandPrince54StepInterpolator(DormandPrince54StepInterpolator interpolator)
Copy constructor. |
Method Summary | |
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protected void |
computeInterpolatedState(double theta,
double oneMinusThetaH)
Compute the state at the interpolated time. |
protected StepInterpolator |
doCopy()
Really copy the finalized instance. |
void |
reinitialize(FirstOrderDifferentialEquations equations,
double[] y,
double[][] yDotK,
boolean forward)
Reinitialize the instance |
void |
storeTime(double t)
Store the current step time. |
Methods inherited from class org.apache.commons.math.ode.RungeKuttaStepInterpolator |
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readExternal, writeExternal |
Methods inherited from class org.apache.commons.math.ode.AbstractStepInterpolator |
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copy, doFinalize, finalizeStep, getCurrentTime, getInterpolatedState, getInterpolatedTime, getPreviousTime, isForward, readBaseExternal, reinitialize, setInterpolatedTime, shift, writeBaseExternal |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private double[] v1
private double[] v2
private double[] v3
private double[] v4
private boolean vectorsInitialized
private static final double a70
private static final double a72
private static final double a73
private static final double a74
private static final double a75
private static final double d0
private static final double d2
private static final double d3
private static final double d4
private static final double d5
private static final double d6
private static final long serialVersionUID
Constructor Detail |
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public DormandPrince54StepInterpolator()
reinitialize(org.apache.commons.math.ode.FirstOrderDifferentialEquations, double[], double[][], boolean)
method should be called before using the
instance in order to initialize the internal arrays. This
constructor is used only in order to delay the initialization in
some cases. The EmbeddedRungeKuttaIntegrator
uses the
prototyping design pattern to create the step interpolators by
cloning an uninitialized model and latter initializing the copy.
public DormandPrince54StepInterpolator(DormandPrince54StepInterpolator interpolator)
interpolator
- interpolator to copy from. The copy is a deep
copy: its arrays are separated from the original arrays of the
instanceMethod Detail |
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protected StepInterpolator doCopy()
doCopy
in class AbstractStepInterpolator
public void reinitialize(FirstOrderDifferentialEquations equations, double[] y, double[][] yDotK, boolean forward)
reinitialize
in class RungeKuttaStepInterpolator
equations
- set of differential equations being integratedy
- reference to the integrator array holding the state at
the end of the stepyDotK
- reference to the integrator array holding all the
intermediate slopesforward
- integration direction indicatorpublic void storeTime(double t)
storeTime
in class AbstractStepInterpolator
t
- current timeprotected void computeInterpolatedState(double theta, double oneMinusThetaH) throws DerivativeException
computeInterpolatedState
in class AbstractStepInterpolator
theta
- normalized interpolation abscissa within the step
(theta is zero at the previous time step and one at the current time step)oneMinusThetaH
- time gap between the interpolated time and
the current time
DerivativeException
- this exception is propagated to the caller if the
underlying user function triggers one
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