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+// Example 9.2
+// Step response of an RC circuit
+C=50*10^-6;
+R_eq=(3000*6000)/(3000+6000); // From figure 9.10(a)
+v_oc=(6*12)/(3+6);
+tau=R_eq*C;
+t=0:0.0001:1
+v=v_oc*(1-exp(-t/tau)); // t>0
+i=(v_oc-v)/(R_eq); // t>0
+subplot(2,1,1)
+plot(t,v,)
+xlabel('t')
+ylabel('v(t)')
+title('Voltage waveform across capacitor')
+subplot(2,1,2)
+plot(t,i)
+xlabel('t')
+ylabel('i(t)')
+title('Current waveform across capacitor')