isActive

Determine if state is active

Syntax

tf = isActive(stateOp)

Description

tf = isActive(stateOp) returns logical 1 (true) if stateOp is the operating point for a state that is active. Otherwise, the function returns logical 0 (false).

Examples

Modify Operating Point Information for State Activity

1. Open the sf_car model.

   openExample("sf_car")

   For more information about this model, see Model a Car with Automatic Transmission.

2. Set the model to save the final operating point. Open the Configuration Parameters dialog box and, in the Data Import/Export pane:

   1. Select Final states and enter a name for the operating point. For this example, use xSteadyState.

   2. Select Save final operating point.

   3. Click OK.

3. Set the stop time for this simulation segment. In the Simulation tab, set Stop Time to 3.

4. Run the simulation.

5. Access the Stateflow.op.BlockOperatingPoint object that contains the operating point information for the shift_logic chart.

   blockpath = "sf_car/shift_logic";
   op = get(xSteadyState,blockpath)

   op = 
   
   Block: "shift_logic"    (handle)    (active)
     Path:     sf_car/shift_logic
   
     Contains:
   
       + gear_state                     "State (AND)"                        (active)       
       + selection_state                "State (AND)"                        (active)       
         gear                           "State output data"                  gearType [1, 1]
         down_th                        "Local data"                         double [1, 1]  
         up_th                          "Local data"                         double [1, 1]  
         datasetWrittenToVector         "Data set written to vector"         logical 4x1  

6. Access the Stateflow.op.OperatingPointContainer object that contains the operating point information for the gear_state state.

   op.gear_state

   ans = 
   
   State: "gear_state"    (handle)    (active)
     Path:     sf_car/shift_logic/gear_state
   
     Contains:
   
       + first          "State (OR)"         (active)
       + fourth         "State (OR)"                 
       + second         "State (OR)"                 
       + third          "State (OR)"

7. Highlight the states that are active in the chart at t = 3.

   highlightActiveStates(op)

   

8. Change the substate activity in the state gear_state to reflect a change in gear.

   setActive(op.gear_state.second)

   

9. Verify that the substate second in the state gear_state is active in the modified operating point.

   isActive(op.gear_state.second)

   ans =
   
     logical
   
      1

10. Remove the highlighting of active states in the Stateflow^® Editor.

    removeHighlighting(op)

Input Arguments

stateOp — Operating point for state

Stateflow.op.OperatingPointContainer object

Operating point for a state, specified as a Stateflow.op.OperatingPointContainer object.

Version History

Introduced in R2009b