using of ss2tf command

[b,a] = ss2tf(A,B,C,D,ni) returns the transfer function that results when the nith input of a system with multiple inputs is excited by a unit impulse.

this is given in mathworks site about ss2tf command

can we use the same form for unit step as it is mentioned for unit impulse(above)

A=[-0.157318 0 0.118;0 -4.561 4.5125;0.118 4.5125 -4.6387];

B=[1/176.7 0;0 1/176.7;0 0];

C=[1 0 0;0 1 0;0 0 1];

D=[0 0 ;0 0;0 0];

this is my state space model , which has two step inputs, how to convert this to TF

Answer 1

[Paul]

In my opinion, that statement in the documentation doesn't make sense. It should say "... returns the Laplace transform of the output that results ...." Or it should say, ".. . returns the transfer functions from the nith input to the ouputs."

Regardless, the "modern" approach would be to form an lti system object

sys = ss(A,B,C,D);

and then use functions like step() or impulse() or lsim() to get system response to inputs of interest.