//Example 5.2:
//Continuous Time Fourier Transform of x(t)=e-a|t|
clc;
close;
a=1;
Dt=0.005;
t=-4.5:Dt:4.5;
xt=exp(-a*abs(t));
Wmax=2*%pi*1;
K=4;
k=0:(K/1000):K;
W=k*Wmax/K;
XW=xt*exp(-sqrt(-1)*t'*W)*Dt;
XW=real(XW);
W=[-mtlb_fliplr(W), W(2:1001)];
XW=[mtlb_fliplr(XW),XW(2:1001)];
subplot(1,1,1)
subplot(2,1,1);
a=gca();
a.y_location="origin";
plot(t,xt);
xlabel('t in sec.');
ylabel('x(t)')
title('Continuous Time Signal')
subplot(2,1,2);
a=gca();
a.y_location = "origin";
plot(W,XW);
xlabel('Frequency in Radians/Seconds W');
ylabel('X(jW)')
title('Continuous-time Fourier Transform')