1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
//determining critical value of K
s=%s
syms K
m=s^3+3*(K)*s^2+(K+2)*s+4
cof_a_0 = coeffs(m,'s',0);
cof_a_1 = coeffs(m,'s',1);
cof_a_2 = coeffs(m,'s',2);
cof_a_3 = coeffs(m,'s',3);
r=[cof_a_0 cof_a_1 cof_a_2 cof_a_3]
n=length(r);
routh=[r([4,2]);r([3,1])];
routh=[routh;-det(routh)/routh(2,1),0];
t=routh(2:3,1:2); //extracting the square sub block of routh matrix
routh=[routh;-det(t)/t(2,1),0]
disp(routh,"rouths tabulation=")
routh(3,1)=0 //For marginaly stable system
|
