Setting Simulink parameter values from script

조회 수: 10 (최근 30일)
Simon Aldworth
Simon Aldworth . 2018년 10월 25일
댓글: Fangjun Jiang . 2018년 10월 29일
Until recently I was running a Simulink model from my main script. The Simulink model uses variables in the blocks and would run perfectly when I used statements such as:
t_step = Simulink.Parameter(1);
I am now running the model from within a gui script and I can't get it to run. My first thought was that there were no Simulink parameters in the model so I put them in, thinking that these had to be there for the above statements to work. This didn't work, however.
I then tried putting the variables into a struct using:
modelparams.t_step = Simulink.Parameter(1);
and then:
This didn't work either.
Then I tried:
And received the response, "block_diagram does not have a parameter named 't_step'".
It is evident that I don't know what I'm doing, so:
1. Several blocks use the same variable so do I need to set each block parameter one at a time, or can I create a Simulink parameter from my GUI script?
2. Do I need the Simulink parameter to pre-exist within the model?
3. Previous responses to other questions suggest that relying on the base workspace to store variables is not good practice, but now I read that when running Simulink models this is the norm. What should I do in this case?
4. Why has it stopped running properly just because I moved my code into the gui script?
Many thanks,

채택된 답변

Fangjun Jiang
Fangjun Jiang 2018년 10월 25일
4. Why has it stopped running properly just because I moved my code into the gui script?
When you run "t_step = Simulink.Parameter(1);" in your GUI script, it created the variable "t_step" in your GUI callback function workspace, not the base workspace.'
There are many ways to solve your problem. The most direct way is to use assignin() function.
  댓글 수: 4
Fangjun Jiang
Fangjun Jiang 2018년 10월 29일
The function assignin() exists for a reason. For occasional use, I would not rule it out. It brings convenience and wouldn't slow down process in most of the cases. In any case, Simulink data dictionary is a better way to go. It separates the data from the software and makes them both become more manageable.

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추가 답변 (1개)

Sara Nadeau
Sara Nadeau 2018년 10월 26일
Hi Simon!
Have you considered using Dashboard blocks to interface with your Simulink model? They offer similar functionalities to a MATLAB GUI with easier connectivity to Simulink models.
I am not sure what your GUI and model look like or what version of MATLAB/Simulink you're working with. Apologies if this suggestion isn't helpful.
  댓글 수: 1
Simon Aldworth
Simon Aldworth 2018년 10월 29일
Hi Sara,
I hadn't, but maybe I will in the future. I'm a long way down the line with my GUI now so I'll stick with it.
Thanks anyway.

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