how do i plot step response of a system using fourier transform?

how do i plot step response here?

clc;
clear all;
syms t;
t= 0:0.001:10
 G = tf([1], [1 0.9 5]);
 [num,den] = tfdata(G);
 syms s
 G_sym = poly2sym(cell2mat(num),s)/poly2sym(cell2mat(den),s)
  Y_four_sym = G_sym/s; % U(s) = 1/s for the unit step
 y_time_sym = ifourier(Y_four_sym);
 y_n = double(y_time_sym);
 subplot(2,1,1)
 plot(t,y_time_sym); % i am getting error over.. here tried using ezplot etc

Answer 1

[Birdman]

If you are dealing with s domain, you need to use ilaplace. Try this:

syms t;
G = tf([1], [1 0.9 5]);
[num,den] = tfdata(G);
syms s
G_sym = poly2sym(cell2mat(num),s)/poly2sym(cell2mat(den),s)
Y_four_sym = G_sym/s; % U(s) = 1/s for the unit step
y_time_sym(t) = ilaplace(Y_four_sym,t);
t=0:0.001:10;
plot(t,y_time_sym(t));

[AAYUSH MARU]

i want the answer in fourier domain as i am dealing with fourier domain!pls help

[AAYUSH MARU]

clc;

clear all;

syms t;

G = tf([1], [1 0.9 5]);

[num,den] = tfdata(G);

syms s

G_sym = poly2sym(cell2mat(num),s)/poly2sym(cell2mat(den),s)

G_sym=subs(G_sym,s,0.1*1i)

Y_four_sym = G_sym/s; % U(s) = 1/s for the unit step

y_time_sym(t) = ilaplace(Y_four_sym,t);

t=0:0.001:10;

plot(t,y_time_sym(t));

i tried using this code! but it is not working i am getting straight line as output