how to fix Error in port widths or dimensions?
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There is a 3x2 matrix in Jac_v input from another subsystem and this is true, but the size of this matrix changes in Matrix Multiply entry . The same problem exists in Matrix Multiply at 4. input. How does it look like this?
Shiva Kalyan Diwakaruni on 24 May 2021
This behavior is due to a different mechanism for "guessing" and propagating signal dimensions in Simulink . This issue can be bypassed by using a Signal Specification block in order to explicitly determine the dimensions of a signal, instead of relying on inheritance.
You can refer to the below link for more information
Hope it helps