How to compile Simulink models before doing simulation?
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I'm working on a MATLAB script that will run different Simulink models but everytime I load one using sim(myModel) it takes an awful lot of time and I need its execution to be practically immediate.
Is there a way to compile at the start of the script and later on when I need to run the simulation just tell it 'play' somehow so that it will run without taking time to load anything else? Or is there any other workaround for this problem?
By the way I tried using
open_system(myModel)
and it gives me an error: Invalid Simulink object handle
Unfortunately that's all it says, but if that's the answer to compiling before the simulation, any ideas of what the problem could be?
Thanks.
1 Comment
Kaustubha Govind
on 12 Jul 2013
Try open_system('myModel') if myModel is the name of your model. This just opens the model, but doesn't compile it.
Accepted Answer
Kaustubha Govind
on 12 Jul 2013
You can use the modelname command to compile the model. For example, if your model is named myModel.mdl or myModel.slx, use the following set of commands:
myModel([], [], [], 'compile')
myModel([], [], [], 'term')
Note that Simulink will still need to perform some compilation tasks when you run the simulation, but if you have Stateflow charts, MATLAB Function blocks, or referenced models, it will definitely help to pre-compile your model.
7 Comments
Andrew Hopkins
on 14 Jun 2018
Is there any documentation on executing the compiled model?
output_vector = model_name(0,state_vector,input_vector);
I have not been able to find any documentation on this, especially the structure of the state, input, output, and what the first argument corresponds to.
Charles Harrison indicated this can be done:
https://www.mathworks.com/matlabcentral/answers/20730-supress-simulink-re-compile-on-every-call
Andrew Hopkins
on 14 Jun 2018
It's sad how much I searched, and then a coworker found this link in 5 seconds.
It was not clear from the other posts (or even the model documentation), that you need to call each function successively for each time step for some total amount of simulation time.
More Answers (2)
Brian Kim
on 19 May 2023
You can use also use set_param as well to compile the model
set_param(modelName, 'SimulationCommand', 'update')
The difference is that in scripting workflow, this will wait until the compilation is finished.
1 Comment
August
on 16 Apr 2024
When I use that command I get the build text through the command window and eventually get the error:
Warning: Non-scalar data in first argument to set_param is detected.
Only first handle in the matrix is processed.
Invalid Simulink object handle
However, when I run:
set_param('modelName','SimulationCommand', 'update')
it runs the command and does not produce any comments in the command window.
Two questions:
- do you know why running the set_param() command with my modelName NOT in quotes does what I want it to do but throws the invalid simulink object handle?
- Is there a way to get the output of set_param() with my ModelName in quotes to produce an output in the command window?
Thanks for your help!
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