Is it possible to have a structure as an input and use its fields as constants in Simulink?

Question

Steven Horstink 2020-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/527788-is-it-possible-to-have-a-structure-as-an-input-and-use-its-fields-as-constants-in-simulink

评论： Steven Horstink 2020-6-5

Suppose I define in a script the structure

par.amplitude = 10;
par.raise = 20;

and then run the Simulink model as in the picture below. The model below gives an error, obviously: the question is, how should I build such a model such that it works as expected? Is this even possible?

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Answer 1

Srivardhan Gadila 2020-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/527788-is-it-possible-to-have-a-structure-as-an-input-and-use-its-fields-as-constants-in-simulink#answer_439798

在 MATLAB Online 中打开

You can refer to Simulink.Bus.createObject & How to convert a struct into a bus.

And the following code might help you:

par.amplitude = 10;
par.raise = 20;
parBusInfo = Simulink.Bus.createObject(par)
parBus = evalin('base',parBusInfo.busName)

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Steven Horstink 2020-6-5

在 MATLAB Online 中打开

My apologies for my late response. I found the answer already and it works like a charm. At first I created the bus objects and fields myself and composed them as one big bus object which will have to exactly match the input structure, then I discovered the shortcut you're referring to which is A LOT simpler and removes the "danger" of mismatching (and spend some time debugging). Since it's exactly what you answered, I'll definitely accept your answer :)

Weird, however, how I spend a few hours scouring the internet for a solution, while the second link you included would've been exactly what I needed.

Also, I had some trouble understanding what a "bus" was. Now that I've worked with it, I suppose I understand, but the first time I read about it was very confusing...

Finally, I'd like to ask about

parBus = evalin('base',parBusInfo.busName)

What does that do?

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