11 Problem A6.12 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:

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