How to get referenced subsystem block name and SLX file path for all the Subsystem References in a model?

I am using MATLAB R2023b and I have top level model "topModel.slx". There is a "Referenced Subsystem" block inside this model, named "Subsystem", while the "Referenced Subsystem" file is saved as "testRefSubsystem.slx".
Is there a function that allows users to retrieve the file paths or model names of all of the "Referenced Subsystem" blocks by passing in the name of a top level model (such as the function "find_mdlref" returning the names of "Referenced Models")? 

Answer 1

[MathWorks Support Team]

To get the name of the "Referenced Subsystem" blocks, you can use the "get_param" function with the Subsystem parameter "ReferencedSubsystem". For more information on the parameter, please see below: 

https://www.mathworks.com/help/releases/R2023b/simulink/slref/subsystem.html#f8-894284_sep_mw_2eeb47de-3e19-446f-9f84-f03bc15c7bf2  

To return the file paths to the SLX files, you can use the function "which". For more information on the function, please see below:

https://www.mathworks.com/help/releases/R2023b/matlab/ref/which.html

Assuming the name of your model is "TopModel", you can search for the "Subsystem" blocks that have input for the "ReferencedSubsystem" parameter using the "find_system" function. In this example, the "blks" variable stores the names of the referenced subsystem:

load_system('topModel');
blks = find_system('topModel','RegExp','on','BlockType','SubSystem','ReferencedSubsystem','.');

Then, you can find the file paths of the referenced subsystems with the "which" function. This example stores the paths in the variable "filePaths": 

refBlks = get_param(blks,'ReferencedSubsystem');
for i = 1:length(refBlks )
filePaths{i} = which(refBlks {i});
end