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+//example 2.1.b
+//check the signal is periodic or not
+clc ;
+t =-15:0.01:15;
+a=1;//assumed the value of a to be equal to 1
+y =exp(a*t);
+plot(t,y);
+xtitle('plot of function exp(a*t)')
+xlabel('time--->')
+disp ( 'Plot  shows that given signal is not periodic' ) ;