public interface ODEStateInterpolator extends Serializable
The various ODE integrators provide objects implementing this interface to the step handlers. These objects are often custom objects tightly bound to the integrator internal algorithms. The handlers can use these objects to retrieve the state vector at intermediate times between the previous and the current grid points (this feature is often called dense output).
ODEIntegrator
,
ODEStepHandler
Modifier and Type  Method and Description 

ODEStateAndDerivative 
getCurrentState()
Get the state at current grid point time.

ODEStateAndDerivative 
getInterpolatedState(double time)
Get the state at interpolated time.

ODEStateAndDerivative 
getPreviousState()
Get the state at previous grid point time.

boolean 
isCurrentStateInterpolated()
Determines if the
current state is computed directly by
the integrator, or if it is calculated using interpolation . 
boolean 
isForward()
Check if the natural integration direction is forward.

boolean 
isPreviousStateInterpolated()
Determines if the
previous state is computed directly
by the integrator, or if it is calculated using interpolation . 
ODEStateAndDerivative getPreviousState()
boolean isPreviousStateInterpolated()
previous state
is computed directly
by the integrator, or if it is calculated using interpolation
.
Typically the previous state is directly computed by the integrator, but when events are detected the steps are shortened so that events occur on step boundaries which means the previous state may be computed by the interpolator.
true
if the previous state was calculated by the interpolator and
false if it was computed directly by the integrator.ODEStateAndDerivative getCurrentState()
boolean isCurrentStateInterpolated()
current state
is computed directly by
the integrator, or if it is calculated using interpolation
.
Typically the current state is directly computed by the integrator, but when events are detected the steps are shortened so that events occur on step boundaries which means the current state may be computed by the interpolator.
true
if the current state was calculated by the interpolator and
false if it was computed directly by the integrator.ODEStateAndDerivative getInterpolatedState(double time)
Setting the time outside of the current step is allowed, but should be used with care since the accuracy of the interpolator will probably be very poor far from this step. This allowance has been added to simplify implementation of search algorithms near the step endpoints.
time
 time of the interpolated pointboolean isForward()
This method provides the integration direction as specified by the integrator itself, it avoid some nasty problems in degenerated cases like null steps due to cancellation at step initialization, step control or discrete events triggering.
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