How can I give inputs to a MIMO statespace model generated using the command ss(a,b,c,d)?

I have obtained the 4 matrices A,B,C and D. I used the inbuilt matlab statespace generator sys_mimo=ss(A,B,C,D) I am trying to get the response of th MIMO statespace model with 2 inputs and 6 outputs. I needed some help regarding 1) How to give a .txt file as an input to the model? 2) How to set a delay between the two inputs? 3) How to obtain the outputs from the statespace model? Any suggesting on this would be helpful.

This is the piece of code under concern % A=[0 1 0 0 0 0 0 0; 0 -(Bf+Br)/ms 0 (lf*Bf-lr*Br)/ms -Kf/ms Bf/ms -Kr/ms Br/ms; 0 0 0 1 0 0 0 0; 0 (lf*Bf-lr*Br)/I 0 -(Bf*lf^2+Br*lr^2)/I lf*Kf/I -lf*Bf/I -lr*Kr/I lr*Br/I; 0 1 0 -lf 0 -1 0 0; -Ktf/muf Bf/muf lf*Ktf/muf -lf*Bf/muf (Kf+Ktf)/muf -Bf/muf 0 0; 0 1 0 lr 0 0 0 -1; -Ktr/mur Br/mur -lr*Ktr/mur lr*Br/mur 0 0 (Kr+Ktr)/mur -Br/mur];

B=[0 0;0 0;0 0;0 0; 0 0; Ktf/muf 0; 0 0;0 Ktr/mur];

C=[1 0 0 0 0 0 0 0; 0 -(Bf+Br)/ms 0 (lf*Bf-lr*Br)/ms -Kf/ms Bf/ms -Kr/ms Br/ms; 0 0 1 0 0 0 0 0; 0 (lf*Bf-lr*Br)/I 0 -(Bf*lf^2+Br*lr^2)/I lf*Kf/I -lf*Bf/I -lr*Kr/I lr*Br/I; 1 0 -lf 0 -1 0 0 0; 1 0 lr 0 0 0 -1 0]; D=[0 0; 0 0 ; 0 0 ; 0 0 ; 0 0 ; 0 0]; sys_mimo= ss(A,B,C,D);

How to proceed from here on?

Answer 1

[Sebastian Castro]

You can use the lsim function to provide arbitrary inputs to a state-space (or transfer function) system and likewise collect the outputs.

http://www.mathworks.com/help/control/ref/lsim.html

As far as reading the inputs into MATLAB from a text file, you could start with the textscan function to see if it does what you want. There are plenty of other related functions that can be used for file I/O.

http://www.mathworks.com/help/matlab/ref/textscan.html

- Sebastian