- Open the ‘MATLAB Function’ block within your model.
- In the ‘Function’ tab, select the 'Edit Data' icon.
Why do i keep get the message "Index expression out of bounds" ?
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I'm simulating a sliding-mode controller with Simulink. Some function in my subsystems keep getting the message "Index expression out of bounds". I have 4 signal go into the mux block, so it supposes to be ranged from 1 to 4 but in the diagnostic viewer said the range is 1-1.
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Answers (1)
Abhaya
on 19 Sep 2024
Hi Hung,
I encountered a similar issue when using a Simulink ‘Mux’ block alongside a ‘MATLAB Function’ block. The error occurs because the Simulink Mux block outputs a virtual vector, which the ‘MATLAB Function’ block processes as individual double values. To resolve this error, you can set a fixed size for the input to the ‘MATLAB Function’ block.
Follow these steps to address the issue:
3. In the ‘Symbol pane’ at the bottom left corner, click on the 'u' variable.
4. In the Property Inspector, set a fixed size for the variable 'u'.
To explore more about Simulink ‘Mux’ block, please refer to the following MATLAB documentation.
Hope this resolves the issue.
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