Two separate questions here.
State-space equations do not have much to do with Stateflow, except for the word "state".
State-space equations are differential equations describing system dynamics. Stateflow is a product for modeling and simulating state machines. To understand state machines, take a look at our recent videos on the topic.
Here is an analogy that maybe could help. Imagine you have an aircraft flying along happily. Then something happens (say it hits a flock of geese) and half of the wing gets teared off.
When the wing gets damaged, aircraft dynamics change suddenly, as a result of the event. Before the accident, a state space system can be used to represent aircraft dynamics. After the accident, a different state space system can represent aircraft dynamics. For the aircraft to keep flying after the accident, control system most probably needs to determine that something bad happened and reconfigure itself. The type of logic that can detect an even happened and take an action to accommodate for it is something that Stateflow can do well.
As for the second question, you need to clarify what you mean exactly.
