How can we use find_system to get a block's SID

In this page of the Matalb's documentation, it is said not to use the Simulink.ID.getSID() command and use find_system instead.

I have trouble understanding how to use find_system in order to replace this command.

I would also like to know why using Simulink.ID.getSID() is not recommanded.

Regards,

P Lepage.

Answer 1

[Fangjun Jiang]

It is true that find_system() is not the real replacement. If full block path is used in Simulink.ID.getSID() to get SID, then the replacement should be get_param(FullBlockPath, 'SID'). find_system might be used to find the block first.

Looking at the warning message in document for Simulink.ID.getSID, Simulink.ID.getHandle and Simulink.ID.hilite, I assume Mathworks is phasing out the Simulink.ID sub-class.

[P Lepage]

The thing I dont like with get_param(FullBlockPath, 'SID') is that is does not returns a SID path. You have to strcat(modelName, ':' , SID).

And as you said, find_system is useful when you don't have block paths.

When you do have them, there dosen't seem to be a recommended way to convert them to SID path.

[Fangjun Jiang]

I can see the need for SID when doing model diff. I have not found any other use case for it. For me, the full block path and the handle are sufficient.

The "ModelName:" prefix is the same for all the blocks in the model, that is why the "SID" property only records the numerical number.

[P Lepage]

Yeah i'm using SID path to deal with object that may change name in a model that may be closed. I get why SID feild is only the SID number, I just wish there was a clean way to get the SID path.

[Fangjun Jiang]

When would the SID path (ModelName:SID) be used? If I know the SID number, I would do find_system(Model,'SID',###).

[P Lepage]

They are stored in a map to have a reference that does not depend on block's name. This map is then used to hilite_system the block it contains through callbacks and generated html documents.