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1 Program 6.1 OGATA 4edition (root locus)




Let us calculate the root-locus of a closed-loop system with feedback by Scilab, whose transfer function in open loop is:

\begin{displaymath}G(s)=\frac{K\cdot(s+3)}{s\cdot (s+1)\cdot (s^{2}+4\cdot s+16)}\end{displaymath}


Program in Scilab 
s=%s;
num=s+3;
den=s*(s+1)*(s^2+4*s+16);
g=syslin('c',num/den);
clf;
evans(g);
v=[-6 6 -6 6];
mtlb_axis(v);