Stateflow

Conditions

You sometimes want transitions or actions associated with transitions to take place only if a certain condition is true. Conditions are placed within [ ]. These are some guidelines for defining conditions:

• The expression must be a Boolean expression of some kind. The condition must evaluate to either true (1) or false(0).
• The expression can consist of:
• Boolean operators that make comparisons between data and numeric values
• Any function that returns a Boolean value
• The In(state_name)condition function that is evaluated as true when the state specified as the argument is active. The full state name, including any ancestor states, must be specified to avoid ambiguity.

Note A chart cannot use the In condition function to trigger actions based on the activity of states in other charts.

• Temporal conditions (see Temporal Logic Operators)
• The condition expression should not call a function that causes the Stateflow diagram to change state or modify any variables.
• Boolean expressions can be grouped using & for expressions with AND relationships and | for expressions with OR relationships.
• Assignment statements are not valid condition expressions.
• Unary increment and decrement actions are not valid condition expressions.

Directed Event Broadcasting

Time Symbol