matlab - Simulink state-space block giving only one output in MIMO model

Question

I have state-space model where:

A is 4x4 matrix, B is 4x1 matrix, C is 1x4 matrix.

I want that model to be simulated in Simulink, simple right? So I made a model as shown in this image.

Why i am getting only one output? Shouldnt I get output of matrix 4x1 therefore four outputs?

question from:https://stackoverflow.com/questions/65640991/simulink-state-space-block-giving-only-one-output-in-mimo-model

Answer 1

Analyzing the state space model consisting of system of matrix equations:

dx = A*x + B*u
y  = C*x + D*u

We can see that size of y (the output) is determined by the number of rows in C and D matrices (number of rows in both matrices must be equal).

In your case size(C) = [1,4], that is the number of rows is 1 so you have only one output.

If you want to extract the whole state you can set C = eye(4) and modify D so that size(D) = [4,1] (as you have 4 outputs now and 1 input).