Define and Use Structure Parameters in Simulink

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James Browne
James Browne on 6 Jan 2022
Commented: James Browne on 6 Jan 2022
Hi,
I wanted to use the method in
to import a struct into a matlab funciton block as I am not really familiar with busses (and the help examples I found weren't really on point as I didn't want to create the struct in simulink, I want to read in a struct created in the workspace into simulink and use it in a function block). This help was referenced in some forum posts I found on this site (I can see this issue comes up but I couldn't get the solutions to work for me, so I must be missing something).
When I follow the guide in the above link, i get the error
----------------------------------------
Parameter struct has a value of an unsupported type Parameter Data 'struct'
Component:MATLAB Function | Category:Coder error
----------------------------------------
Is anyone able to assist with where I have gone wrong?

Accepted Answer

Paul
Paul on 6 Jan 2022
Do you actually have a variable in the base (or model, I suppose) workspace named 'struct'? That would be odd because struct is a built-in function, and normally one doesn't name variables to override built-in function names.
The function signature in the block should be:
[FX,FY,MZ] = solve_function(GAMMA,FZ,alpha_deg,k,mystruct)
mystruct needs to be defined in the base workspace (or I think it can be in the model workspace), and the Scope of mystruct should be set to Parameter in the Ports and Data Manager.
  2 Comments
James Browne
James Browne on 6 Jan 2022
infact, that looks like it was the issue. Even though I wasn't calling the text, its existance in the struct caused the problem.

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