Persistent variables from Simulink to Matlab

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Baf85
Baf85 on 5 Jul 2021
Edited: Walter Roberson on 3 Sep 2021
Hi, I have an Entity Server with a persistent matrix that changes with every entity entering. After i've run the simulation i want to open the matrix in the Matlab workspace (or also in Excel if that's possible). How does that work?
Here's the code that's called after the entities enter the server. Regards!
persistent cnt
if isempty(cnt)
cnt=0;
end
persistent x
if isempty(x)
x=zeros(100,3);
end
cnt=cnt+1;
x(cnt,1) = entity.Attribute1;
x(cnt,2) = entity.Attribute2;
x(cnt,3) = entity.Attribute3;

Answers (3)

Vimal Rathod
Vimal Rathod on 8 Jul 2021
Hi,
You could refer to the following link to know mroe about how to export the simulink data from the model to the worksapce.

Abdolkarim Mohammadi
Abdolkarim Mohammadi on 3 Sep 2021
I think the best way to do this is to create a Simulink function that includes no blocks, but its output port is connected to a "To Workspace" block. After the termination of the simulation, results are sent to the base workspace. You can also create a "PostSimFcn" to automatically export this data to Excel, but you need to use SimulationInput methodology.

Walter Roberson
Walter Roberson on 3 Sep 2021
Edited: Walter Roberson on 3 Sep 2021
It is not possible to access persistent variables inside a function that is not executing (or at least there is no documented way to do so.)
If you were to write in the form of a Level-2 S function, you could implement a Terminate https://www.mathworks.com/help/simulink/sfg/terminate.html that emitted the values some-how.
If you were to write in the form of a Level-1 S function, you would look for flag value 9 for Terminate; https://www.mathworks.com/help/simulink/sfg/maintaining-level-1-matlab-s-functions.html
Or you could rewrite the persistent variables in the form of global variables, and make sure to register the global block at the appropriate model level https://www.mathworks.com/help/simulink/ug/using-global-data-with-the-matlab-function-block.html

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