I need a substitute for the eval function in Simulink?

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.

[Stefan Andrei]

Hello, I have exactly the same problem. Have you found any solution?

[Robert Brown]

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]

Alright, thank you for the quick response.

Answer 1

[prabhat kumar sharma]

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.

You Can refer this docuemntation for further reference:

https://www.mathworks.com/help/slrealtime/parameter-tuning-2.html

https://www.mathworks.com/help/slrealtime/ug/tune-parameters-with-simulink-external-mode.html

I hope it helps!