How to programatically send Update Diagram command to Simulink

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

[Walter Roberson]

Are you using set_param() do do the updates?

[Paulo Silva]

No, the GUI just changes values of the variables on the workspace and the simulation files and other tools (to calculate performance parameters) use those variables.

[Vinol Joy D'souza]

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???

Answer 1

[Fangjun Jiang]

Use set_param('sys', 'SimulationCommand', 'cmd')?

where 'sys' is the name of the system and 'cmd' is 'start', 'stop', 'pause', 'continue', 'update', or 'WriteDataLogs'

[Paulo Silva]

Thank you Fangjun, your solution works just fine, I should have known it but after one entire day doing code my brain isn't working at 100% anymore :)

[Vinol Joy D'souza]

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???

[dc]

that's what i need,thanks

Answer 2

[Noam Greenboim]

set_param(bdroot,'SimulationCommand','Update')

[João]

This worked for me. Thanks!

[Jyoti Sachdeva]

Instead of using bdroot,

mdlName = MotorCtrl.slx

set_param(mdlName,'SimulationCommand','Update')

This command is equivalent to programatically running Ctrl+D on MotorCtrl.slx model.

Answer 3

[Rick Rosson]

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

[Paulo Silva]

Thanks Rick, I tested that code but it didn't work, thank you anyway for trying :)