Simulink transitions and superstates, will you go back to the outside state?

Question

I have a system setup like the sample stateflow:

Condition1 Occurs and we go to Sub1. If Condition3 then occurs will it bring us back to Test1? Similarly if we get to sub2 through Condition1 and Condition2 and then Condition4 occurs will we go back to Test1?

Answer 1

You can test this for yourself, define the ConditionX variables as local symbols to that Stateflow model, and some variable x which you can look at while stepping through the Stateflow evaluation. Set a breakpoint where the Condition1 transition is (right click the line, add breakpoint) and then run your model to step through it.

In my screenshots I've shortened the ConditionX names to cX.

In short, no you won't re-enter Test1 without a state transition back to it from Super. Control will be returned to the Super state (out of the Sub1 state) and then follow the default transition back into Sub1.

So If c1 and c3 are true, c2 is false.

1. Default transition into Test1, set x=0.
2. Transition from Test1 to Super because c1 is true.
3. Default transition into Sub1, set x=1.
4. Transition back to Super because c2 is false (no transition to Sub2) but c3 is true.
5. Repeat steps 3. and 4. x=1 does not change again.

If c2 is true then you transition into Sub2 instead of step 4. above, x=2.

If c4 is also true then you transition out of Sub2 back into Super, and follow the default transition back into Sub1.

If you want to return to Test1 then you need to add a default transition from Super to Test1. Note that in this trivial example Condition1 is always true, so it would then immediately transition back into Super and Sub1.