I want to find \$k_1\$ that leads to the feedbakc system having poles in the 53º line (to have overshoot \$\leq 10\%\$). From the root locus, the poles move along the vertical asymptote centered on -1. How can I find \$k_1\$ using Scilab and how can I draw diagonal lines representing the 53º line in which I want my poles to be at?
So far, I made this graph in Scilab,
s=%s; num=2; den=s*(s+2) t=syslin('c',num/den); clf; evans(t); mtlb_axis([-10 10 -2 2]);