Working with MATLAB classes in the Level-2 MATLAB S-Functions

Hello,

I need an access to methods and properties of the Matlab class object (not related to axis) in the Level-2 MATLAB S-Functions. Methods and properties are used through the setup (i.e. port types) and simulation process.

Questions:

1. I need to construct an object inside an s-function. Inside what S-Function Callback Method is it better to do?

2. What are the legal ways to pass an object handle to the Lev2 S-function? Via the DialogPrm().Data?

3. What is the best way to pass object handle to the Callback Methods?

Kind regards,

Timur

Answer 1

[Kaustubha Govind]

The ideal technique to save data in an S-function in such a way that it is available in all the callback methods is to use Work Vectors. In C-MEX S-functions, PWork vectors can be used to cache data of any type. However, the only type of work vectors available in MATLAB S-functions are DWork vectors, which can only store numeric types. The only other way I can think of sharing data between the S-function methods is to use the block UserData property. You can construct your object in the setup() method and destroy it in Terminate(). You can set/get the object on the block UserData property as follows:

   set_param(block.BlockHandle, 'UserData', myobj);
   myobj = get_param(block.BlockHandle, 'UserData');

Caveat: This is mostly a hack that I dreamed up - please look out for unintended consequences.

[Paramjeet Panwar]

Works well for my use case! (Define and get a COM object handel from the base workspace and use it in a Matlab S-Function)

Answer 2

[Craig]

More info here