How to change the value of constant while simulation is running

Question

Samah EL QASSAH 2017-6-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346948-how-to-change-the-value-of-constant-while-simulation-is-running

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

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Adam 2017-6-30

I don't use Simulink, but surely the whole purpose of a constant is that it is constant?!

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Vincent Nicolazzo 2019-3-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346948-how-to-change-the-value-of-constant-while-simulation-is-running#answer_364141

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Roadrunner Development 2020-5-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346948-how-to-change-the-value-of-constant-while-simulation-is-running#answer_433128

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.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

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.

请先登录，再进行评论。

Answer 3

Saeed Ahmadzadeh Mahboobi 2020-11-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346948-how-to-change-the-value-of-constant-while-simulation-is-running#answer_550348

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.