MATLAB: Am I unable to access the “InheritDataSize” property using the Stateflow API in Stateflow 6.4 (R2006a)

inheritdatasizeinheritdatatypeiscomplexparametersstateflow

When I execute the following commands:

sf_car 
rt = sfroot;
chart = rt.find('-isa','Stateflow.Chart') 
data = chart.find('-isa','Stateflow.Data'); 
data(1).InheritDataSize 
data(1).InheritDataType 
data(1).IsComplex

I receive the following error:

 ??? No appropriate method or public field InheritDataSize for class Stateflow.Data.

I also receive a similar error when I try to access "IsComplex" and "InheritDataType" properties.

Best Answer

This is an error within the documentation for Stateflow within the Data Properties section. These properties no longer exist. Similar information can be accessed as follows:

For InheritDataSize, using the following:

data(1).Props.Array.Size

Where a result of '-1' means 'Inheirited'. For InheritDataType, use the following

data(1).Props.Type.Method

Where the results can be any of the following depending on the type: {'Built-in','Bus Object','Expression','Fixed point','Inherited'}. For IsComplex, use:

data(1).Props.Complexity

Where the results can be any of the following: {'Inherited', 'On', 'off'}.

Related Solutions

MATLAB: How to pass a variable to a Stateflow chart without having to specify the size of the data parameter in Stateflow 6.3 (R14SP3)

This enhancement has been incorporated in Release 2009b (R2009b). For previous product releases, read below for any possible workarounds:

You can work around this error by setting the size of the Stateflow variable dynamically at runtime. In the Model Explorer, add a script into the InitFcn callback function to set the size of the Stateflow variable "a" every time the model is run.

For this script, you need to obtain handles to Stateflow objects. See the documentation "Using the Stateflow API" available at the following URL:

http://www.mathworks.com/help/stateflow/programmatic-manipulation.html

In particular, the "Quick Start for Stateflow API" through "Accessing Existing Stateflow Objects" sections provide information about accessing object handles.

The following sample code shows how to set the size of Stateflow data

variable "a" to equal the size of MATLAB workspace variable "x", using

commands in the InitFcn callback function:

rt = sfroot;
m = rt.find('-isa','Simulink.BlockDiagram');
onState = m.find('-isa','Stateflow.Data','-and','Name','a');
onState.Props.Array.Size = num2str(length(x));

A sample Stateflow model is attached as an example. To run the model, create a MATLAB workspace variable "x", as in this example:

x = 0:0.1:N;

N can be any number. The Stateflow model outputs the sine of "x" into a MATLAB workspace variable "v". By accessing the handles to objects in the Stateflow chart, you can automatically set the size the Stateflow data parameter "a" to equal the size of the MATLAB workspace variable "x".

MATLAB: How to specify the “MemoryAddress_ASAP2” property for the ASAP2 type object in Real-Time Workshop 6.4 (R2006a)

This is an error in the documentation for Real-Time Workshop 6.4 (R2006a) in the "Defining ASAP2 Information" section.

The documentation should state that the "MemoryAddress_ASAP2" property does not exist in the ASAP2.Signal or ASAP2.Parameter data object class shipped with the Real Time Workshop. To use this functionality, this property needs to be added to a custom class that is a subclass of the ASAP2 or Simulink class.

To do this, use the SLDATACLASSDESIGNER to create a custom class derived from the ASAP2 class, and define a new property "MemoryAddress_ASAP2". For information on sub-classing Simulink Data Class, please refer to the "Subclassing Simulink Data Classes" section of the Simulink documentation.

The error has been corrected in the Real-Time Workshop 6.4 (R2006b) documentation.

Best Answer

Related Solutions

MATLAB: How to pass a variable to a Stateflow chart without having to specify the size of the data parameter in Stateflow 6.3 (R14SP3)

MATLAB: How to specify the “MemoryAddress_ASAP2” property for the ASAP2 type object in Real-Time Workshop 6.4 (R2006a)

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