A state transition table is an alternative way of expressing sequential modal logic. Instead of drawing states and transitions graphically in a Stateflow® chart, use state transition tables to express the modal logic in tabular format. State transition tables are supported only as blocks in a Simulink® model.
Benefits of using state transition tables include:
Ease of modeling train-like state machines, where the modal logic involves transitions from one state to its neighbor
Concise, compact format for a state machine
Reduced maintenance of graphical objects
When you add or remove states from a chart, you have to rearrange states, transitions, and junctions. When you add or remove states from a state transition table, you do not have to rearrange any graphical objects.
State transition tables support using MATLAB® and C as the action language. For more information about the differences between these action languages, see Differences Between MATLAB and C as Action Language Syntax.
The following state transition table contains the modal logic for maintaining the temperature of a boiler between two set points:
This Stateflow chart represents the same modal logic:
If you specify an action in a transition cell, it must be a condition action.
State transition tables must have at least one state row and one transition column.
State transition tables support a subset of the most commonly used elements in Stateflow charts. Elements that state transition tables do not support include:
Parallel (AND) decomposition
Use of chart-level functions (graphical, truth table, MATLAB, and Simulink)
A state transition table contains the following components:
Each transition column contains the following state-to-state transition information:
At the MATLAB command prompt, enter:
From the Simulink Library Browser:
Select the Stateflow library.
Drag a state transition table into your model.
To access properties, in the Stateflow editor, select Chart > Properties.
These properties are the same as those for charts that use MATLAB as the action language. For a description of each property, see Specify Properties for Stateflow Charts.
Stateflow software automatically generates a read-only state transition diagram from the state transition table you create. As you enter changes to a state transition table, Stateflow incrementally updates the diagram as well. To see the most up-to-date version of the underlying diagram, select Chart > View auto-generated diagram.