Define and Use Structure Parameters in Simulink

Hi,

I wanted to use the method in

https://au.mathworks.com/help/simulink/ug/define-and-use-structure-parameters-in-matlab-function-blocks.html

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

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Parameter struct has a value of an unsupported type Parameter Data 'struct'

Component:MATLAB Function | Category:Coder error

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Is anyone able to assist with where I have gone wrong?

Answer 1

[Paul]

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.

[James Browne]

I did, I have now called it mystruct.

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mystruct =

struct with fields:

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I am still having the same issue. Mystruct does contain both text and numbers. Maybe this is the issue?

[James Browne]

infact, that looks like it was the issue. Even though I wasn't calling the text, its existance in the struct caused the problem.