I need a substitute for the eval function in Simulink?

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Robert Brown 2021-11-4

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回答： prabhat kumar sharma 2024-7-2

I have a program in simulink and need to set/chage a number of variable values while executing. I found this can easily do this in Matlab using the eval function, but can't find something similar on the Simulink side. One need-to-know is the executable is running on a remote machine.

Example of it working in Matlab:

Say variable foo = 1, I can send a UDP message with the string "foo=2", and process that string with eval function, now foo=2.

I've also tried assignin(), but it too is "not supported for code generation"

Any help would be appreciated.

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Robert Brown 2023-3-14

I never recieved any feedback, this would be a super useful routine. We had to just predetermine all the variables we would want to change and create unique messages for each, super annoying.

Stefan Andrei 2023-3-14

Alright, thank you for the quick response.

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Answer 1

prabhat kumar sharma 2024-7-2

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Hi Robert,

I understand that you want parameter tuning in Simulink similar to MATLAB's eval(). Here are two methods that might be useful:

Method 1: Using Simulink Real Time Explorer

You can use Simulink Real-Time Explorer to change parameters in your real-time application while it is running or between runs. This method does not require rebuilding the Simulink model or setting it to external mode.

https://www.mathworks.com/help/slrealtime/ug/tune-parameters-with-xpc-target-explorer.html

Method 2: Tune Parameters by using simulink external mode.

Here are the steps you can follow:

Use external mode in Simulink to allow real-time parameter tuning.
Define the parameters you want to change as tunable parameters.
Use set_param to change the values of these parameters dynamically while the model is running.
Set up a communication mechanism (e.g., UDP) to receive commands and execute them using set_param.