For example, the input can be a 2x1 column vector, the output a 2x1 column vector, and the transfer function a 2x2 matrix. In this case, the system would be, for example, as follows: [ In1; In2 ] = [(1/(s+1) 3/(s^2+2s) ; s/(s^2+1) 1 ] x [Out1 ; Out2]. The “Matlab Function” block would be an option to implement this transfer function, but it does not accept “tf” functions. Any help is highly appreciated.