/**
* Initialize the integrator. Check for the existence of a director and an ODE solver. Set the
* state to the value given by <i>initialState</i>.
*
* @exception IllegalActionException If there is no director, or the director has no ODE solver,
* or the initialState parameter does not contain a valid token, or the superclass throws it.
*/
public void initialize() throws IllegalActionException {
ContinuousDirector dir = (ContinuousDirector) getDirector();
if (dir == null) {
throw new IllegalActionException(this, " no director available");
}
ContinuousODESolver solver = dir._getODESolver();
if (solver == null) {
throw new IllegalActionException(this, " no ODE solver available");
}
super.initialize();
_lastRound = -1;
_tentativeState = ((DoubleToken) initialState.getToken()).doubleValue();
_state = _tentativeState;
if (_debugging) {
_debug("Initialize: initial state = " + _tentativeState);
}
// The number of auxiliary variables that are used depends on
// the solver.
int n = solver.getIntegratorAuxVariableCount();
if ((_auxVariables == null) || (_auxVariables.length != n)) {
_auxVariables = new double[n];
}
}
/**
* Return the suggested next step size. This method delegates to the integratorPredictedStepSize()
* method of the current ODESolver.
*
* @return The suggested next step size.
*/
public double suggestedStepSize() {
ContinuousODESolver solver = ((ContinuousDirector) getDirector())._getODESolver();
return solver.integratorSuggestedStepSize(this);
}
/**
* Return true if the state is resolved successfully. If the input is not available, or the input
* is a result of divide by zero, a NumericalNonconvergeException is thrown.
*
* @return True if the state is resolved successfully.
*/
public boolean isStepSizeAccurate() {
ContinuousODESolver solver = ((ContinuousDirector) getDirector())._getODESolver();
_successful = solver.integratorIsAccurate(this);
return _successful;
}