Please help$1\mathrm{.}4$ Computer simulation

The following are few of the important MATLAB commands for

computer analysis of systems represented in state$-$space model.

$[A,B,C,D]=$ tf$2$ss$($num$,$ den$)$;

$[A,B,C,D]=zp2ss(z,p,k)$;

$[$num$,$ den$]=ss2tf(A,B,C,D)$;

$[z,p,k]=ss2zp(A,B,C,D)$;

pvalues $=$eig$(A)$;

step$($A$,$B$,$C$,$D$)$;

$[y,x,t]=$step$(A,B,C,D)$;

$[y,x,t]=$step$(A,B,C,D,u)$;

Example $6$

Use the commands

given above to perform

a simple computer

analysis on the transfer

function

$\frac{Y}{U}=\frac{25}{s^2+4s+25}$