How to change simulink variable from matlab script?

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David Boelke
David Boelke 2022-10-10
回答： David Boelke 2022-10-21
This is a simplified example of the problem I am facing.
What I have:
I have a simulink model (PT1.slx):
And I have a matlab script (control.m):
% clean up
clear
close all
clc
% use simulink
set_param('PT1/K','Value','3');
out=sim('PT1');
% plot results
plot(out.output);
hold on
plot(out.input);
The script, can set the value of a constant, start the model and plot the output, neat!
What I want:
I want to be able to control the value inside my transfer function from my matlab script, for instance this:
What I have tried:
I have found out, that you can't control values like the one circled in red from datalines, for numeric reasons. But I can create a 'variable' for this value and control it from the 'model explorer', but how I can control my variables from a matlab script I do not know.
I have read through the 'set_param' help to see if it could be used for my purposes, but it seems I need a different tool.
I have searched around and found forum entries like
this: https://de.mathworks.com/matlabcentral/answers/426069-setting-simulink-parameter-values-from-script
It talks about how someone can control 'simulink parameters', I don't think that is the same as a 'variable'.

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采纳的回答

Benjamin Thompson
Benjamin Thompson 2022-10-10

更多回答（2 个）

Fangjun Jiang
Fangjun Jiang 2022-10-10
编辑：Fangjun Jiang 2022-10-10
You can use set_param().
block='PT1/Transfer Fcn';
a=get_param(block,'Denominator')
b=eval(a)
b(2)=1.5
c=mat2str(b)
set_param(block,'Denominator',c);
a =
'[1 1 0]'
b =
1 1 0
b =
1.0000 1.5000 0
c =
'[1 1.5 0]'
  1 个评论
David Boelke
David Boelke 2022-10-21
That is also a good solution, I used the model workspace, but yours is a good answer, as it is closer to what I used before, thank you.

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David Boelke
David Boelke 2022-10-21
What I used is this:
a=get_param(bdroot,'modelworkspace');
T=1;
a.assignin('T',T);
Then I just replace the number in my simulink with the variable T. It is amazing, I can place variables either in the model workspace or in the base workspace, very cool.

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