8 Program 6.9 OGATA 4edition (root locus, damping ratio)

Let us calculate the root-locus with indication of damping ratio =0.5 by Scilab of a system with closed loop with feedback unit whose transfer function in open loop is:

Program in Scilab num=poly([1 -0.5 0],'s','coeff'); den=poly([0 1 1],'s','coeff'); g=syslin('c',num/den); clf; evans(g); v=[-2 6 -4 4]; mtlb_axis(v) xgrid; sgrid([0.5],[0],1);