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+//Example 1.19.1
+//whether the signal is energy signal or power signal
+clc ;
+ t =0:0.001:10;
+ y= exp (-10*t);
+ E= integrate ( ' ( exp(-10*t)) ^2 ' , ' t ' ,0 ,2* %pi );
+disp (E, ' Energy o f the s i g n a l i s ' );
+ disp ( 'since the energy is finite hence it is energy signal');
+ figure
+plot(t,y,'red');
+xtitle('Required figure');