Struct as input to a Simulink MATLAB Function block

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Johannes Köppern
Johannes Köppern 2018-8-28
编辑： Nicolò Binda 2020-4-24
Hi!
I want to simulate a physical system with the scalar state x, the parameters data and the differential equation dx/dt = dxdt(x,data), e. g.
function xDot = dxdt(x,data)
xDot=data.a+data.b*x;
I want to call this function from a Simulink Function block.
How can I hand the data struct into the Simulink block? Is there maybe a better way to store the model's parameters? Due to the type of the model's parameters a named way to store different types of parameters would be great. Having a vector to store the parameters is only my last resort.
Thank's in advance!

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采纳的回答

Johannes Köppern
Johannes Köppern 2018-8-29
I found the answer myself on https://de.mathworks.com/help/simulink/ug/parameter-arguments-in-matlab-function-block-functions.html: In the MATLAB Function Block Editor, add an argument to the function header of the MATLAB Function block. The name of the argument must match the name of the masked parameter or MATLAB variable that you want to pass to the MATLAB Function block.
The new argument appears as an input port on the MATLAB Function block in the model.
In the MATLAB Function Block Editor, click Edit Data.
Select the new argument.
Set Scope to Parameter and click Apply.
The input port for the parameter argument no longer appears in the MATLAB Function block.

更多回答（4 个）

TAB
TAB 2018-8-29
编辑：TAB 2018-8-29
Check below links:
Connect Structures in MATLAB Functions to Bus Signals in Simulink
Attach Bus Signals to MATLAB Function Blocks
To connect the structure input or output in a MATLAB function with Simulink, you must define a Simulink.Bus object in the base workspace. Then use this bus object as signal datra type for the signals which are to be connected to Matlab function.
Johannes Köppern
Johannes Köppern 2018-8-29
Thank's alot! That is what I was looking for!
Johannes Köppern
Johannes Köppern 2018-8-29
Hi there, once again!
I was able to implement a bus containing the static parameters from my struct in the workspace.
Since this made quite some work necessary I ask you, if there is an even easier way to hand static (constand) parameterst to a Matlab function within Simulink. Still I want to keep the data in a greater super-structure so I don’t get to many inputs to my Simulink function?
Can you think about a method?
Once again, thanks in advance!
  2 个评论
TAB
TAB 2018-8-30
编辑：TAB 2018-8-30
If you have parameters on base workspace then you can access them directly in Matlab function (just like in stateflow).
  1. Open Model Explorer
  2. In Model Hierarchy window--> Select you s-function
  3. Add data --> Change data name to same as parameter name --> Select "Scope" as "Parameter".
Nicolò Binda
Nicolò Binda 2020-4-24
编辑：Nicolò Binda 2020-4-24
Hi
I've got a structure in matlab and a bus with the same Hierarchy linket to an entity in simulink (i generate the bus from the struct and i selected in the entity generator as entity type "bus" and i choose the bus.
now i need to import data from the struct to the bus (so to each entity generated) but i'm not able to do this.
many thanks
Nicolò

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Johannes Köppern
Johannes Köppern 2018-8-30
Thank's! That's exactly what I was looking for.

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