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How to programatically send Update Diagram command to Simulink

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I stumble upon a problem in my project, there's one GUI that controls the simulation and that GUI changes variables on MATLAB workspace, the same variables are used in the simulation but simulink doesn't read the new values unless the simulation stops and starts or the Update Diagram command is issued, so the question is how to force simulink to Update Diagram in my code?
Already tried:
eval([SimFileName '([],[],[],''update'')' ]);
but it doesn't do what I want.
Meanwhile I found one solution but it's using QuaRC MATLAB Functions, would be better to have something withing simulink functions.
qc_update_model
Any help is welcome, thanks
  3 Comments
Vinol Joy D'souza
Vinol Joy D'souza on 19 Jul 2011
I want to change the parameters of a block when the model is running and simultaneously see the changes in the output.
For eg.I have a sine block connected to a Scope.and when i start the simulation.I want to change the frequency of the sine wave and see the corresponding frequency changed wave on the scope output.I want to do this as i want to see how my model behaves for different frequencies...HOw do i do this???

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 15 Jul 2011
Use set_param('sys', 'SimulationCommand', 'cmd')?
where 'sys' is the name of the system and 'cmd' is 'start', 'stop', 'pause', 'continue', 'update', or 'WriteDataLogs'
  2 Comments
Vinol Joy D'souza
Vinol Joy D'souza on 19 Jul 2011
I want to change the parameters of a block when the model is running and simultaneously see the changes in the output.
For eg.I have a sine block connected to a Scope.and when i start the simulation.I want to change the frequency of the sine wave and see the corresponding frequency changed wave on the scope output.I want to do this as i want to see how my model behaves for different frequencies...HOw do i do this???

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More Answers (2)


Rick Rosson
Rick Rosson on 15 Jul 2011
Hi Paulo,
Although not ideal, the following line of code should work:
Simulink.BlockDiagram.getSampleTimes(SimFileName);
Make sure that the value of SimFileName excludes the .mdl extension, and that the file is already open at the time of the call.
HTH.
Rick
  1 Comment
Paulo Silva
Paulo Silva on 15 Jul 2011
Thanks Rick, I tested that code but it didn't work, thank you anyway for trying :)

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