Page 199 - MATLAB an introduction with applications

184 ——— MATLAB: An Introduction with Applications

>> B=[1; 0; 0];
>> C=[0 20 5];
>> D=[0];
>> [y, x, t]= step (A, B, C, D);
>> plot(t, y)
>> grid
>> title(‘Unit–response’)
>> xlabel(‘t Sec’)
>> ylabel(‘Output y (t)’)
Unit Response
1

0.9
0.8

0.7

0.6
y(t)
Output 0.5

0.4

0.3

0.2

0.1

0
0 5 10 15 20 25 30 35
t Sec
Fig. E3.30(a) Unit-step response

Unit-ramp response:
−  5 − 30 − 5 0  0
 1 0 0 0   A 0 
AA =   =   = A [zeros (2, 1); C 0]
 0 1 0 0  0
   
  0 25 5 0    0 25 5 0 

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