How to change the input of a subsystem using open_system
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There are two blocks in the model I designed: MATLAB Function and testSub.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1574637/image.png)
At this time, I would like to control the input of testSub using MATLAB Function.
So I designed the code as below.
function y = fcn(u)
coder.extrinsic("set_param");
coder.extrinsic("close_system");
coder.extrinsic("open_system");
set_param('untitled1/Subsystem/testSub','OpenFcn','');
open_system('untitled1/Subsystem/testSub','OpenFcn');
y=1;
I want to set input to 'u' in set_param, but is there any way?
help will be appreciated.
Thanx
2 commentaires
Réponse acceptée
Angelo Yeo
le 25 Déc 2023
I understood that you want to input a signal to input port. You don't need to use set_param. You can use Data Import/Export functionality in Simulink. See the documentation below which has examples on how to implement them.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1576137/image.png)
Moreover, if you are to create test cases for Simulink models, you can consider using Simulink Test. You can author tests with shipped funcitonalities such as importing external file data for test cases, e.g., Excel spreadsheet. Please refer to the doc below for detailed information on how to create tests with user-defined input signals.
2 commentaires
Angelo Yeo
le 26 Déc 2023
Modifié(e) : Angelo Yeo
le 26 Déc 2023
You can use variables from base workspace. This means you can always set your variables as you need and run simulation with the sim command in an m-file.
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