Step response of individual input/outputs in a controlled MIMO system

Hello all,

I have made a SISO controller for a MIMO (2x3) system/plant. The controller uses the first output of the plant en generates a signal for the first input of the plant. But for verification, i need a step response from the third input to the first output of the plant. How can i create this in Matlab without Simulink ?

I have added an illustration to clear things up.

So I want the monitor the response of output 1 with respect to the step on input 3, while output is also controlled by the controller.

This is what i got to get the system in matlab,

    L = series(C,FWT,1,1);  % C = controller, FWT = Plant
    K = ss(eye(1));         % static identity gain
    Syscl = feedback(L,K,1,1);  %create connection of SISO controller and MIMO plant,  

connecting output 1 of controller with input 1 of plant

I have tried making a custom input sequence in combination of lsim, but the lsim command cannot handle this system.

Can someone help me?

Answer 1

[Frank]

Somehow the illustration didn't work, here is a link: http://s4.postimg.org/unrbbojrx/mimostep.png