Stateflow

Specifying Substate Decomposition

You specify whether a superstate contains parallel (AND) states or exclusive (OR) states by setting its decomposition. A state whose substates are all active when it is active is said to have parallel (AND) decomposition. A state in which only one substate is active when it is active is said to have exclusive (OR) decomposition. An empty state's decomposition is exclusive.

To alter a state's decomposition, select the state, right-click to display the state's shortcut menu, and choose either Parallel (AND) or Exclusive (OR) from the menu.

You can also specify the state decomposition of a chart. In this case, Stateflow treats the chart's top-level states as substates of the chart. Stateflow creates states with exclusive decomposition. To specify a chart's decomposition, deselect any selected objects, right-click to display the chart's shortcut menu, and choose either Parallel (AND) or Exclusive (OR) from the menu.

The appearance of a superstate's substates indicates the superstate's decomposition. Exclusive substates have solid borders, parallel substates, dashed borders. A parallel substate also contains a number in its upper right corner. The number indicates the activation order of the substate relative to its sibling substates.

Moving and Resizing States

Specifying Activation Order for Parallel States