Stateflow.Data
Data in chart, state, box, or function
Description
Use Stateflow.Data
objects to store values that are visible at a
specific level of the Stateflow® hierarchy. For more information, see Add Stateflow Data and
Set Data Properties.
Creation
Description
Input Arguments
parent
— Parent for new data object
Stateflow.Chart
object | Stateflow.State
object | Stateflow.Box
object | Stateflow.Function
object | ...
Parent for the new data object, specified as a Stateflow API object of one of these types:
Properties
Stateflow API objects have properties that correspond to the values you set in the Stateflow
Editor. To access or modify a property, use dot notation. To access or modify multiple
properties for multiple API objects, use the get
and
set
functions, respectively. For more information, see Modify Properties and Call Functions of Stateflow Objects.
Interface
Name
— Name of data object
"data"
(default) | string scalar | character vector
Name of the data object, specified as a string scalar or character vector.
Scope
— Scope of data object
"Local"
(default) | "Input"
| "Output"
| "Constant"
| "Parameter"
| "Data Store Memory"
| "Temporary"
| "Imported"
| "Exported"
Scope of the data object, specified as one of these values:
"Local"
"Input"
"Output"
"Constant"
"Parameter"
"Data Store Memory"
"Temporary"
"Imported"
"Exported"
For more information, see Scope.
Port
— Port index for data object
scalar
Port index for the data object, specified as an integer scalar. This property applies only to input and output data. For more information, see Port.
UpdateMethod
— Method for updating data object
"Discrete"
(default) | "Continuous"
Method for updating data object, specified as "Discrete"
or
"Continuous"
. This property applies only when the
ChartUpdate
property of the chart that contains the data is
"CONTINUOUS"
. For more information, see Continuous-Time Modeling in Stateflow.
InitializeMethod
— Method for initializing data object
"Expression"
(default) | "Parameter"
| "Not Needed"
Method for initializing the value of the data object, specified as a string scalar or character vector that depends on the scope of the data:
For local and output data, use
"Expression"
or"Parameter"
.For constant data, use
"Expression"
.For input data, parameters, and data store memory, use
"Not Needed"
.
To specify the initial value of the data object, use the
Props.InitialValue
property.
For more information, see Initialize method.
SaveToWorkspace
— Whether to save data object to workspace variable
false
or 0 (default) | true
or 1
Whether to save the value of the data object to a variable of the same name in the
MATLAB® base workspace at the end of the simulation, specified as a numeric or
logical 1 (true
) or 0 (false
). This property
applies only to data in charts that use C as the action language. For more
information, see Save final value to base workspace.
Tunable
— Whether data object is tunable parameter
true
or 1 (default) | false
or 0
Whether the data object is a tunable parameter, specified as a numeric or logical
1 (true
) or 0 (false
). Only tunable parameters
can be modified during simulation. This property applies only to parameter
data.
Data Specification
DataType
— Type of data object
"Inherit: From definition in chart"
(default) | "double"
| "single"
| "int32"
| "uint32"
| "boolean"
| ...
Type of the data object, specified as a string scalar or character vector that
depends on the Props.Type.Method
property of the data object:
If the
Props.Type.Method
property of the data object is"Inherit"
, the value of this property is"Inherit: From definition in chart"
for local data and"Inherit: Same as Simulink"
for input, output, and parameter data.If the
Props.Type.Method
property of the data object is"Built-in"
, you can specify this property with one of these options:"double"
"single"
"int8"
"int16"
"int32"
"int64"
"uint8"
"uint16"
"uint32"
"uint64"
"boolean"
"string"
"ml"
(Supported only in charts that use C as the action language)
Otherwise, the
Props.Type
properties of the data object determine the value of this property.
For more information, see the section Add Data in Create Charts by Using the Stateflow API.
Props
— Data specification properties
Stateflow.DataProps
object
Data specification properties, specified as a Stateflow.DataProps
object with these properties:
Type.Method
— Method for setting the type of the data object, specified as a string scalar or character vector.For local, input, output, or parameter data, use
"Inherited"
,"Built-in"
,"Bus Object"
,"Enumerated"
,"Expression"
, or"Fixed point"
.For constant data, use
"Built-in"
,"Expression"
, or"Fixed point"
.For data store memory data, use
"Inherited"
.
This property is equivalent to the Mode field of the Data Type Assistant in the Model Explorer and the Data properties dialog box. For more information, see Specify Scope and Type of Stateflow Data.
Type.BusObject
— Name of theSimulink.Bus
object that defines the data object, specified as a string scalar or character vector. This property applies only when theType.Method
property of the data object is"Bus Object"
. For more information, see Access Bus Signals.Type.EnumType
— Name of the enumerated type that defines the data object, specified as a string scalar or character vector. This property applies only when theType.Method
property of the data object is"Enumerated"
. For more information, see Reference Values by Name by Using Enumerated Data.Type.Expression
— Expression that evaluates to the data type of the data object, specified as a string scalar or character vector. This property applies only when theType.Method
property of the data object is"Expression"
. For more information, see Specify Data Properties by Using MATLAB Expressions.Type.Signed
— Signedness, specified as a numeric or logical 1 (true
) or 0 (false
). This property applies only when theType.Method
property of the data object is"Fixed point"
. For more information, see Fixed-Point Data in Stateflow Charts.Type.WordLength
— Word length, in bits, specified as a string scalar or character vector. This property applies only when theType.Method
property of the data object is"Fixed point"
. For more information, see Fixed-Point Data in Stateflow Charts.Type.Fixpt.ScalingMode
— Method for scaling the fixed-point data object, specified as"Binary point"
,"Slope and bias"
, or"None"
. This property applies only when theType.Method
property of the data object is"Fixed point"
. For more information, see Fixed-Point Data in Stateflow Charts.Type.Fixpt.FractionLength
— Fraction length, in bits, specified as a string scalar or character vector. This property applies only when theType.Method
property is"Fixed point"
and theType.Fixpt.ScalingMode
property is"Binary point"
.Type.Fixpt.Slope
— Slope, specified as a string scalar or character vector. This property applies only when theType.Method
property is"Fixed point"
and theType.Fixpt.ScalingMode
property is"Slope and bias"
.Type.Fixpt.Bias
— Bias, specified as a string scalar or character vector. This property applies only when theType.Method
property is"Fixed point"
and theType.Fixpt.ScalingMode
property is"Slope and bias"
.Type.Fixpt.Lock
— Whether to prevent replacement of the fixed-point type with an autoscaled type chosen by the Fixed-Point Tool (Fixed-Point Designer), specified as a numeric or logical 1 (true
) or 0 (false
). This property applies only when theType.Method
property of the data object is"Fixed point"
.Array.Size
— Size of the data object, specified as a string scalar or character vector. For more information, see Specify Size of Stateflow Data.Array.IsDynamic
— Whether the data object has variable size, specified as a numeric or logical 1 (true
) or 0 (false
). This property is equivalent to the Variable Size check box in the Property Inspector, the Model Explorer, or the Data properties dialog box. For more information, see Declare Variable-Size Data in Stateflow Charts.Array.FirstIndex
— Index for the first element of the array data object, specified as a string scalar or character vector. This property applies only to array data in charts that use C as the action language. For more information, see Save final value to base workspace.Complexity
— Whether the data object accepts complex values, specified as"On"
or"Off"
. For more information, see Complex Data in Stateflow Charts.InitialValue
— Initial value, specified as a string scalar or character vector. For more information, see Initial value.Range.Minimum
— Minimum value, specified as a string scalar or character vector. For more information, see Limit range.Range.Maximum
— Maximum value, specified as a string scalar or character vector. For more information, see Limit range.ResolveToSignalObject
— Whether the data object resolves to aSimulink.Signal
object that you define in the model or base workspace, specified as a numeric or logical 1 (true
) or 0 (false
). For more information, see Resolve Data Properties from Simulink Signal Objects.Unit.Name
— Unit of measurement, specified as a string scalar or character vector. This property applies only to input and output data. For more information, see Specify Units for Stateflow Data.
CompiledSize
— Data size as determined by compiler
""
(default) | character vector
This property is read-only.
Data size as determined by the compiler, specified as a character vector.
CompiledType
— Data type as determined by compiler
"unknown"
(default) | character vector
This property is read-only.
Data type as determined by the compiler, specified as a character vector.
Active State Output
OutputState
— State or chart monitored by data object
[]
(default) | Stateflow.AtomicSubchart
object | Stateflow.Chart
| Stateflow.SimulinkBasedState
object | Stateflow.State
object | Stateflow.StateTransitionTableChart
object
This property is read-only.
State or chart monitored by the data object, specified as an empty array or a
Stateflow.AtomicSubchart
, Stateflow.Chart
,
Stateflow.SimulinkBasedState
, Stateflow.State
, or
Stateflow.StateTransitionTableChart
object. For more information,
see Monitor State Activity Through Active State Data.
Signal Logging and Test Point Monitoring
LoggingInfo
— Signal logging properties
Stateflow.SigLoggingInfo
object
Signal logging properties for the data object, specified as a Stateflow.SigLoggingInfo
object
with these properties:
DataLogging
— Whether to enable signal logging, specified as a numeric or logical 1 (true
) or 0 (false
).DecimateData
— Whether to limit the amount of logged data, specified as a numeric or logical 1 (true
) or 0 (false
).Decimation
— Decimation interval, specified as an integer scalar. This property applies only when theDecimateData
property istrue
.LimitDataPoints
— Whether to limit the number of data points to log, specified as a numeric or logical 1 (true
) or 0 (false
).MaxPoints
— Maximum number of data points to log, specified as an integer scalar. This property applies only when theLimitDataPoints
property istrue
.NameMode
— Source of the signal name, specified as"SignalName"
or"Custom"
.LoggingName
— Custom signal name, specified as a string scalar or character vector. This property applies only when theNameMode
property is"Custom"
.
Signal logging saves the values of the data object to the MATLAB workspace during simulation. For more information, see Log Simulation Output for States and Data.
Example: data.LoggingInfo.DataLogging = true;
TestPoint
— Whether to set data object as test point
false
or 0 (default) | true
or 1
Whether to set the data object as a test point, specified as a numeric or logical
1 (true
) or 0 (false
). You can monitor
testpoints with a floating scope during simulation. You can also log test point values
to the MATLAB workspace. For more information, see Monitor Test Points in Stateflow Charts.
Debugging
Debug
— Debugger properties
Stateflow.DataDebug
object
Debugger properties for the data object, specified as a Stateflow.DataDebug
object with this property:
Watch
— Whether to track the value of the data object in the Breakpoints and Watch window, specified as a numeric or logical 1 (true
) or 0 (false
). For more information, see View Data in the Breakpoints and Watch Window.
Example: data.Debug.Watch = true;
Hierarchy
Machine
— Machine that contains data object
Stateflow.Machine
object
This property is read-only.
Machine that contains the data object, specified as a Stateflow.Machine
object.
Path
— Location of parent in model hierarchy
character vector
This property is read-only.
Location of the parent of the data object in the model hierarchy, specified as a character vector.
Identification
Description
— Description
""
(default) | string scalar | character vector
Description for the data object, specified as a string scalar or character vector.
Document
— Document link
""
(default) | string scalar | character vector
Document link for the data object, specified as a string scalar or character vector.
Tag
— User-defined tag
[]
(default) | any data type
User-defined tag for the data object, specified as data of any type.
SSIdNumber
— Session-independent identifier
scalar
This property is read-only.
Session-independent identifier, specified as an integer scalar. Use this property to distinguish the data object from other objects in its parent chart.
Id
— Unique identifier
scalar
This property is read-only.
Unique identifier, specified as an integer scalar. Unlike
SSIdNumber
, the value of this property is reassigned every time
you start a new MATLAB session and may be recycled after an object is deleted.
Object Functions
getParent | Identify parent of object |
getReferences | Identify references to symbol name |
renameReferences | Rename symbol and update references to symbol name |
dialog | Open properties dialog box |
view | Display object in editing environment |
Examples
Add Data to Chart
Add a data object to the chart ch
. Specify its name, scope, and
data type.
data = Stateflow.Data(ch); data.Name = "x"; data.Scope = "Input"; data.Props.Type.Method = "Built-in"; data.DataType = "single";
Rename Data and Update References in Chart
Rename and update the references to the chart output y
.
Open the model and access the Stateflow.Data
object for the chart output y
.
open_system("sfRectifyAPIExample") data = find(sfroot,"-isa","Stateflow.Data",Scope="Output"); data.Name
ans = 'y'
Find the locations where the chart refers to the chart output.
references = getReferences(data)
references=2×1 SymbolReference array with properties:
Position
WhereUsed
Display the names and entry actions of the states that refer to the chart output.
whereUsed = [references.WhereUsed]; classes = arrayfun(@class,whereUsed,UniformOutput=false); idx = (classes=="Stateflow.State"); states = whereUsed(idx); get(states,{"Name" "EntryAction"})
ans = 2x2 cell
{'On' } {'y = x;'}
{'Off'} {'y = 0;'}
Change the Name
property of the chart output to "z"
and update the references to the output in the chart.
renameReferences(data,"z")
data.Name
ans = 'z'
Display the names and modified entry actions of the states that refer to the chart output.
get(states,{"Name" "EntryAction"})
ans = 2x2 cell
{'On' } {'z = x;'}
{'Off'} {'z = 0;'}
Version History
Introduced before R2006aR2023a: New object functions
The object functions getReferences
and
renameReferences
find and update the locations, such as state and
transition actions, where the chart refers to the name of a data object:
The object function
getReferences
returns the locations where a chart refers to a data name.The object function
renameReferences
renames a data object and updates all references to the data name in the chart.
R2021b: Stateflow no longer supports creating machine-parented data
The Stateflow.Data
function does not support arguments of type
Stateflow.Machine
. The presence of machine-parented data in a model
prevents the reuse of generated code and other code optimizations. This type of data is also
incompatible with many Simulink® and Stateflow features. To make Stateflow data accessible to other charts and blocks in a model, use data store memory.
For more information, see Access Data Store Memory from a Chart.
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