Why am I getting a "Signal Dimension" error?

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Ismaeel 2017-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/326834-why-am-i-getting-a-signal-dimension-error

评论： Faouzi 2020-5-17

I am wondering why I get the following error message. There is no problem with the signal dimension as shown.Also, I am not using any Matlab-defined function. The block B includes a "Matrix Multiplier" and the rest are constant, gain, sum and integral blocks. The constant and gain are in the form of vectors or matrices but they do not violate matrix multiplication or summation rules regarding their dimension. Any idea? Thanks for your time and your reply

Error: "Unable to determine signal dimensions. There is a loop consisting of '....' that cannot be resolved because signal dimensions are defined by a cyclic relationship. Specifying the signal dimensions on Inport, Mux, Selector, Demuxes will help resolve signal dimensions in the loop. You can also use the Signal Specifications to define the signal dimensions."

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Ismaeel 2017-2-26

编辑：Ismaeel 2017-2-26

Thanks Walter for your time and your notice. Exactly as you pointed out, the problem was in subsystem B and I fixed it following your notice. I changed the setting of the first upper (Matrix Multiplier) block which has input from y3 as you mentioned from (Matrix(*)) to (Element-wise(.*)). I am really grateful to your help, thank you so much.

Ismaeel 2017-2-26