The term data type refers to the way computers represent numbers in memory. The type determines the amount of storage allocated to data, the method of encoding a data value as a pattern of binary digits, and the operations available for manipulating the data.
To specify the data type in the editor:
Open the Symbols and Property Inspector windows from the View menu.
Select the data object row in the Symbols window.
In the Property Inspector, enter the data type directly in the Type field, or select it from the Type drop-down list.
To specify the type of a Stateflow® data object with the Data Type Assistant:
Open the Data properties dialog box.
Click the Data Type Assistant button.
Choose a Mode in the Data Type Assistant section of the dialog box.
You can choose from these modes for each scope.
|Scope||Data Type Modes|
|Inherit||Built in||Fixed point||Enumerated||Expression||Bus Object|
For charts that use MATLAB as the action language, yes
|Data Store Memory|
Based on the mode you select, specify a data type.
|Mode||What To Specify|
You cannot specify a value. You inherit the data type based on the scope you select for the data object:
Select a data type from the drop-down list of supported data types, as described in Built-In Data Types.
Specify the following information about the fixed-point data:
For information on how to specify these fixed-point data properties, see Fixed-Point Data Properties.
Specify the class name for the enumerated data type. For more information, see Define Enumerated Data in a Chart.
Enter an expression that evaluates to a data type in the Type field. You can use these expressions:
For more information on how to build expressions in the Data properties dialog box, see Enter Expressions and Parameters for Data Properties.
In the Bus object field,
enter the name of a
Click Apply to save the data type settings.
Note: The Data Type Assistant is available only with the Data properties dialog box. It is not available with the Symbols window.
You can choose from these built-in data types:
64-bit double-precision floating point
32-bit single-precision floating point
32-bit signed integer
16-bit signed integer
8-bit signed integer
32-bit unsigned integer
16-bit unsigned integer
8-bit unsigned integer
Boolean (1 = true; 0 = false)
Typed internally with the MATLAB array
|Scope:||Can inherit type from:|
|Input||Simulink input signal connected to corresponding input port in chart|
|Output||Simulink output signal connected to corresponding output
port in chart|
|Parameter||Corresponding MATLAB workspace variable or Simulink parameter in a masked subsystem|
|Data Store Memory||Corresponding Simulink data store|
To configure these objects to inherit data types, create the
corresponding objects in the Simulink model, and then select
Same as Simulink from the Type drop-down
list in the Data properties dialog box. For more information, see Specify Data Type with the Data Type Assistant.
To determine the data types that the objects inherit, build the Simulink model and look at the Compiled Type column for each Stateflow data object in the Model Explorer.
You can use the
type operator to derive data
types from previously defined Stateflow data. In the following
example, the expression
type(inbus) specifies the
data type of the Stateflow structure
inbus is defined by the
Therefore, the structure
derives its data type from the bus object
After you build your model, the Compiled Type column of the Model Explorer shows the type of each data object in the compiled simulation application. For more information, see type Operator.
You can specify the type of Stateflow data by using a Simulink data
type alias (see
the Simulink Reference documentation). Suppose that you define
a data type alias named
MyFloat as follows:
MyFloat = Simulink.AliasType; MyFloat.BaseType = 'single';
In the following example, the data
the same type as
After you build your model, the Compiled Type column of the Model Explorer shows the type used in the compiled simulation application.
By default, inputs to and outputs from charts are of type
Input signals from Simulink models convert to the type of the
corresponding input data objects in charts. Likewise, the data output
objects convert to
double before they are exported
as output signals to Simulink models.
To interface directly with signals of data types other than
the need for conversion, select Use Strong Data Typing with
Simulink I/O in the chart properties. The chart accepts
input signals of any data type that Simulink supports, as long
as the data type of the input signal matches the type of the corresponding Stateflow data
object. Otherwise, you receive a type mismatch error.
Note: For fixed-point data, select Use Strong Data Typing with Simulink I/O to flag mismatches between input or output fixed-point data in charts and their counterparts in Simulink models.