% Chapter 4: Figure 4.34, p. 210%% Compute the input step response for Ka=10.  % Results shown in Figure 4.34 (b).% Select Ka=80 to obtain the corresponding step response.%Ka=10; nf=[5000]; df=[1 1000]; ng=[1]; dg=[1 20 0];[num,den]=series(Ka*nf,df,ng,dg);[n,d]=cloop(num,den);t=[0:0.01:2];y=step(n,d,t);plot(t,y), gridylabel('y(t)'), xlabel('Time (sec)')