Package org.hipparchus.ode.nonstiff
Class MidpointIntegrator
- java.lang.Object
-
- org.hipparchus.ode.AbstractIntegrator
-
- org.hipparchus.ode.nonstiff.FixedStepRungeKuttaIntegrator
-
- org.hipparchus.ode.nonstiff.MidpointIntegrator
-
- All Implemented Interfaces:
ButcherArrayProvider
,ExplicitRungeKuttaIntegrator
,ODEIntegrator
public class MidpointIntegrator extends FixedStepRungeKuttaIntegrator
This class implements a second order Runge-Kutta integrator for Ordinary Differential Equations.This method is an explicit Runge-Kutta method, its Butcher-array is the following one :
0 | 0 0 1/2 | 1/2 0 |---------- | 0 1
-
-
Field Summary
Fields Modifier and Type Field Description static String
METHOD_NAME
Name of integration scheme.
-
Constructor Summary
Constructors Constructor Description MidpointIntegrator(double step)
Simple constructor.
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected MidpointStateInterpolator
createInterpolator(boolean forward, double[][] yDotK, ODEStateAndDerivative globalPreviousState, ODEStateAndDerivative globalCurrentState, EquationsMapper mapper)
Create an interpolator.double[][]
getA()
Get the internal weights from Butcher array (without the first empty row).double[]
getB()
Get the external weights for the high order method from Butcher array.double[]
getC()
Get the time steps from Butcher array (without the first zero).-
Methods inherited from class org.hipparchus.ode.nonstiff.FixedStepRungeKuttaIntegrator
getDefaultStep, integrate
-
Methods inherited from class org.hipparchus.ode.AbstractIntegrator
acceptStep, addEventDetector, addStepEndHandler, addStepHandler, clearEventDetectors, clearStepEndHandlers, clearStepHandlers, computeDerivatives, getCurrentSignedStepsize, getEquations, getEvaluations, getEvaluationsCounter, getEventDetectors, getMaxEvaluations, getName, getStepEndHandlers, getStepHandlers, getStepSize, getStepStart, incrementEvaluations, initIntegration, isLastStep, resetOccurred, sanityChecks, setIsLastStep, setMaxEvaluations, setStateInitialized, setStepSize, setStepStart
-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Methods inherited from interface org.hipparchus.ode.nonstiff.ExplicitRungeKuttaIntegrator
getNumberOfStages, singleStep
-
Methods inherited from interface org.hipparchus.ode.ODEIntegrator
addEventDetector, addStepEndHandler, addStepHandler, clearEventDetectors, clearStepEndHandlers, clearStepHandlers, getCurrentSignedStepsize, getEvaluations, getEventDetectors, getMaxEvaluations, getName, getStepEndHandlers, getStepHandlers, getStepStart, integrate, setMaxEvaluations
-
-
-
-
Field Detail
-
METHOD_NAME
public static final String METHOD_NAME
Name of integration scheme.- See Also:
- Constant Field Values
-
-
Method Detail
-
getC
public double[] getC()
Get the time steps from Butcher array (without the first zero).- Returns:
- time steps from Butcher array (without the first zero
-
getA
public double[][] getA()
Get the internal weights from Butcher array (without the first empty row).- Returns:
- internal weights from Butcher array (without the first empty row)
-
getB
public double[] getB()
Get the external weights for the high order method from Butcher array.- Returns:
- external weights for the high order method from Butcher array
-
createInterpolator
protected MidpointStateInterpolator createInterpolator(boolean forward, double[][] yDotK, ODEStateAndDerivative globalPreviousState, ODEStateAndDerivative globalCurrentState, EquationsMapper mapper)
Create an interpolator.- Specified by:
createInterpolator
in classFixedStepRungeKuttaIntegrator
- Parameters:
forward
- integration direction indicatoryDotK
- slopes at the intermediate pointsglobalPreviousState
- start of the global stepglobalCurrentState
- end of the global stepmapper
- equations mapper for the all equations- Returns:
- external weights for the high order method from Butcher array
-
-