How to change the value of constant while simulation is running

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Samah EL QASSAH
Samah EL QASSAH 2017-6-30
评论： Mikhail Savastianov 2021-10-22
Hi,
I would like to change the value of a constant on simulink but I get the following error:
"Cannot change parameter 'Value' of 'untitled/Constant' while simulation is running. The block was made virtual as it was optimized for simulation"
Somebody please help me in this regard

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回答（3 个）

Vincent Nicolazzo
Check out this link. It's not the best method but it worked for me. I would run my simullation and change the value of the constant in the command window.
https://www.mathworks.com/help/simulink/ug/parameter-values-and-specification-methods.html
Roadrunner Development
I had the same issue. When you run simulation, and want to change the paramter in real-time, use set_param command line function. However, enable that signal for logging before running the simulation. I do not know why is this so, but I found it out by chance, and it works.
On the other hand, if you run real-time code on a target machine (speedgoat for example), use setparam and getparam. No logging necessary.
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Mikhail Savastianov
Mikhail Savastianov 2021-10-22
Hi! Your advice does not work for me. I can change parameters during the simulation only. When I run my model on hardware in real time, nothing works (neither slider, nor setparam). Logging the signal does not change anything.

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Saeed Ahmadzadeh Mahboobi
If you want to do it during the simulink simulation, then the block "IC" in simulink/sinks , which is a "initial condition" block, and can change in each simulink iteration, might be helpful.

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