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+//example 3_11
+//exponential fourier Series coefficient and corresponding spectra
+clc;
+clear;
+close;
+//Assume period of the impulse train T=2
+T=2;
+t=-5*T:T:5*T;
+for i=1:length(t)
+x(i)=1;
+end
+//Using shifting property of the impulse signal//
+k=-10:10
+for i=1:length(k)
+ak(i)=1/T;
+end
+subplot(2,1,1)
+plot(t,x,'.')
+xtitle("Impulse train","t","x(t)")
+subplot(2,1,2)
+plot(k,ak,'.')
+xtitle("Fourier coefficients of impulse train","k","ak")