Simulink cannot unify the dimensions of the multiplexed signal at output

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he 2024-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/2112896-simulink-cannot-unify-the-dimensions-of-the-multiplexed-signal-at-output

回答： Animesh 2024-5-2

hello，i have a error.

who can help me!!!

Simulink cannot unify the dimensions of the multiplexed signal at output port 1 of 'untitled0417/PSS /In1' to match the input dimension of input port 1 of 'untitled0417/PSS /Transfer Fcn1'. Specifically, Simulink cannot unify {[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1],[-1]} to match [-1]. Consequently, Simulink cannot propagate dimension information from output port 1 of 'untitled0417/PSS /In1' to input port 1 of 'untitled0417/PSS /Transfer Fcn1'.

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Answer 1

Animesh 2024-5-2

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Hey @he

Seems like you are trying to pass values from inport block to transfer function but are unable to do so because transfer function block expects a single value as an input.

In this case we can use the 1x2 demux block and pass the value from one of the 2 outports to the transfer function block. Since all the 24 values are the same, this technique will probably yield the desired result.

I have attached an image below for better understanding:

You can refer the following MathWorks documentation for more information:

https://www.mathworks.com/help/releases/R2019b/simulink/slref/demux.html

https://www.mathworks.com/help/releases/R2019b/simulink/slref/transferfcn.html