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+clc;
+clear all;
+//chapter 3
+//page no 89
+//example 3.7
+A=1;    //arbitrary vaule
+T=(1+4)*10^-3;    //period in seconds
+tau=1*10^-3;   //pulse width in second
+fc=30*10^6;    //centre frequency in Hz
+d=tau/T;        //duty cycle
+f1=1/T;        //Fundamental frequency in Hz
+
+//for plot
+n=[-14:15];    //in Hz
+Vf=[]
+for i=1:length(n)
+    if n(i)==0 then
+        Vf(i*200)=A*d;
+    else
+       Vf(i*200)=A*d*sin(%pi*d*n(i))/(%pi*d*n(i)) 
+    end
+      
+end
+f=-3000:3000-1
+f=f+fc;    //Shifting by fc
+f=f*10^-6;   //in MHz
+clf;
+plot2d(f,Vf,[5])
+xtitle('Amplitude Spectrum','f,MHz','Vn');
+xgrid