Check state activity
in( returns 1
true) if the state
state_name is active.
Otherwise, the operator returns 0 (
Synchronize Substate Activity Between Parallel States
Check the substate activity in state
to keep the substates of state
Fan.On becomes active, transition from
Fan.Off becomes active, transition from
A change of active substate in
Fan causes a
corresponding change of active substate in
Find Number of Active Subcomponents
Set the value of
airflow to the number of
fans that are turned on.
airflow = in(FAN1.On) + in(FAN2.On);
To determine the state activity, a Stateflow® chart performs a localized search of the state hierarchy. The chart does not perform an exhaustive search for all states and does not stop after finding the first match. To improve the chances of finding a unique search result:
Use dot notation to qualify the name of the state.
Give states unique names.
Use states and boxes as enclosures to limit the scope of the path resolution search.
Additionally, a chart cannot use the
in condition to trigger
actions based on the activity of states in other charts.
For more information, see Resolution of State Activity.
Introduced before R2006a