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+clc
+//Example 9.4
+//Calculate settling time
+t=0:0.1:5
+ic=2*exp(-t)-4*exp(-t)
+plot(t,ic)
+xtitle('ic vs t','t in s','ic in A')
+//Let ts be the settling time
+//From the graph the maximum value is|-2|=2A
+//'ts' is the time when ic has decreased to 0.02A
+//On solving for 'ts'
+ts=-log(0.02/4)
+printf("ts=%3.2f s\n",ts)