SimulationMetaData manipulation in Simulink

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Isaac De La Cruz
Isaac De La Cruz 2025-6-5
编辑： Isaac De La Cruz 2025-7-4
Hello,
I am looking to manipulate the SimulationMetaData property from Simulink.SimulationOutput object.
I am interested in expanding the UserData property to add custom data.
Tried the PostSimFcn property by registering a callback that modifies the output object, and works fine, but when enabling LoggingToFile option on model settings, the modification is not preserved in the *mat file.
At the end, I would like my output mat file containing simulink results (logsout, yout, etc) and SimulationMetaData containing the modifications made.
Any suggestions?
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Gayathri
Gayathri 2025-6-6
Hey @Isaac De La Cruz,
Can you elaborate more on what function and method you are using. I am asking as when I tried to modify the "UserData" property using "PostSimFcn", I am getting the below error.
Error executing 'PostSimFcn' on SimulationInput object.
Caused by:
Error using postsim
Setting the 'SimulationMetadata' property of class 'Simulink.SimulationOutput' is not supported.

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Sameer
Sameer 2025-7-4
Hi @Isaac De La Cruz
When "Logging to File" is enabled in Simulink, simulation results are written to the MAT file before any modifications made by "PostSimFcn" are applied. As a result, custom data added in "PostSimFcn" does not appear in the saved file.
As a workaround you can attach custom data after the simulation and then save.
Here's how you can do it:
out = sim(mdl, 'LoggingToFile','on', 'LoggingFileName','out.mat', ...);
out = setUserData(out,myCustomData); % attach your data
save('out_with_metadata.mat','out'); % save combined data+metadata
Hope this helps!
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Isaac De La Cruz
Isaac De La Cruz 2025-7-4
编辑：Isaac De La Cruz 2025-7-4
Hello @Sameer,
Alright! I thought that when the 'LoggingToFile' option is enabled it included also the changes made to the Simulink's output.
Thanks for the clear explanation!

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