ltiview

num=[24.542]
den=[1 4 24.542]
transfer_function1=tf(num,den)

num2=[-2 -4]
den2=[1 4]
transfer_function2=tf(num2,den2)

num3=[-2 -4]
den3=[1 4]
t=[0:.001:4]';
transfer_function3=4*tf(num3,den3)
step_response3=step(transfer_function3,t);
plot(t,step_response3)
xlabel('The t axis')
ylabel('The y axis')
title('The  4*unit step response')
grid on

