1 den
num=250
den=[1,2,0,250];
k=250
sys=tf(num,den)
roots(den)
rlocus(num,den,k)
ans =
-7.0417 + 0.0000i
2.5209 + 5.3989i
2.5209 - 5.3989i }
2.num+den
num=[250]
den=[1,2,0];
k=250
sys=tf(num,den)
roots(den+num)
rlocus(num,den,k)
ans =
-0.5020 + 0.8626i
-0.5020 - 0.8626i