Why do i keep get the message "Index expression out of bounds" ?

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Hung Ly 2022-3-29

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回答： Abhaya 2024-9-19，8:31

B5.slx

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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Answer 1

Abhaya 2024-9-19，8:31

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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: