how to fix Error in port widths or dimensions?

Hello!

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 [3]. The same problem exists in Matrix Multiply at 4. input. How does it look like this?

Answer 1

[Shiva Kalyan Diwakaruni]

Hi,

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

https://www.mathworks.com/help/simulink/slref/signalspecification.html

Hope it helps