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+//Example 5.6
+// Continuous Time Fourier Transform
+clear;
+clc;
+close;
+A=1;
+Dt=0.005;
+T1=4;
+t=-T1/2:Dt:T1/2;
+for i=1:length(t)
+  xt(i)=A;
+end
+Wmax=2*%pi*1;
+K=4;
+k=0:(K/1000):K;
+W=k*Wmax/K;
+xt=xt';
+XW=xt*exp(-sqrt(-1)*t'*W) * Dt;
+XW_Mag=real(XW);
+W=[-mtlb_fliplr(W), W(2:1001)];
+XW_Mag = [mtlb_fliplr(XW_Mag), XW_Mag(2:1001)];
+subplot(2,1,1);
+a=gca();
+a.data_bounds=[-4,0;4,2];
+a.y_location="origin";
+plot(t,xt);
+xlabel('t in msec.');
+title('Contiuous Time Signal x(t)')
+subplot(2,1,2);
+a=gca();
+a.y_location="origin";
+plot(W,XW_Mag);
+xlabel('Frequency in Radians/Seconds');
+title('Continuous-time Fourier Transform  X(jW)')