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Table 10 lists the event handling functions. These functions allow you to tell the integrator how or whether to handle events, and reset the event finder after a terminal event. Note that event handling can only be done with a Butcher Table method that supports dense output.
Table 10 Event Handling Functions.
|
Function |
Description |
|
UsingEvents |
Returns true if the integrator is looking for events. |
|
UseEvents |
Tells the integrator whether or not to look for events. |
|
OutputEventsInYOut |
Tells the integrator to output the events in YOut, even if they do not occur at one of the requested output times. |
|
ResetTerminalEvent |
Resets the terminal event flag, allowing integration to continue. |
|
ReachedTerminalEvent |
Returns true if a terminal event has been reached (stops integration). |
if ( pInteg->UsingEvents() ).
None.
|
Type |
Description |
|
bool |
Returns true if the integrator is handling events, false otherwise. |
None.
pInteg->UseEvents();
pInteg->UseEvents(flag);
|
Variable |
Type |
Description |
|
flag |
bool |
(Optional). Flag telling the integrator whether or not to look for events. Default: true. |
None.
This function tells the integrator to start or stop looking for events. Event handling requires a Butcher Table with dense output (such as DOPRI5). In other cases, this flag is ignored.
pInteg->OutputEventsInYOut();
pInteg->OutputEventsInYOut(flag);
|
Variable |
Type |
Description |
|
flag |
bool |
(Optional). Flag telling the integrator whether or not to output events to the output vector. Default: true. |
None.
This function tells the integrator to output the event times and states to the output vectors. By default, events are only stored in their own output (see Event Output Functions, below). This causes these output values to also be copied into the normal output values returned by GetTOut( and GetYOut(). Note that this will cause irregular output as the event times generally do not occur at the requested output times. It does, however, smooth the output to show more clearly where events occur.
pInteg->ResetTerminalEvent();
None.
None.
This function tells the integrator to reset the terminal event flag, which is set when the ODE indicates that a terminal event has occurred. This allows you to continue integrating beyond this point (usually after resetting some of the event states).
if ( pInteg->ReachedTerminalEvent() ).
None.
|
Type |
Description |
|
bool |
Returns true if the integrator has reached a terminal event, false otherwise. |
None.
|
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