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+//Example 5.2
+//Root locus with respect to a plant open loop pole.
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+
+//------------------------------------------------------------------
+//System transfer function and its root locus 
+s=poly(0,'s');
+Gs=s/(s*s+1);
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; //custom script for setting figure properties
+evans(Gs,100)
+title(['Root locus vs. damping factor','$c$',...
+'for','$1+G(s)=1+1/[s(s+c)]=0$'],'fontsize',3)
+zoom_rect([-2 -1.5 2 1.5])
+h=legend('');
+h.visible = "off"
+
+//------------------------------------------------------------------
+