Why does the 'UserData' property for a block not persist across Simulink

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thomas - 2021-10-09T12:08:48+00:00
Question: Why does the 'UserData' property for a block not persist across Simulink

Why does the 'UserData' property for a block not persist across Simulink sessions even though I have the 'UserDataPersistent' property set to 'on'?  

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  • Why does the 'UserData' property for a block not persist across Simulink

    • Expert Answer

    Profile picture of Kshitij Singh Kshitij Singh answered . 2025-11-20

    Any entity that can be saved in a MAT file and then loaded back to the MATLAB workspace will persist when saved in the 'UserData' field for a block.
     
    For example, a .NET object cannot be saved in a MAT file and retrieved later. Hence, if it is attached to the 'UserData' property, it will be lost if the model is closed or Simulink is closed.
     
    The 'UserData' and 'UserDataPersistent' properties for any block can be set using the 'set_param' command. For example, after selecting a block in a Simulink block diagram, the following commands can be used to set the properties:
     
     
    >> set_param(gcb,'UserData',5)

>> set_param(gcb,'UserDataPersistent','on')


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