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//Example 5.12
//Negative root Locus for an Airplane.
xdel(winsid())//close all graphics Windows
clear;
clc;
//------------------------------------------------------------------
//System transfer function and its root locus
s=poly(0,'s');
Ls=-(s-6)/(s*(s^2+4*s+13));
evans(Ls)
//Title, labels and grid to the figure
exec .\fig_settings.sci; //custom script for setting figure properties
title(['Negative root locus for','$L(s)=\frac{s-6}{s(s^2+4s+13)}$'],...
'fontsize',3)
zoom_rect([-5 -6 10 6])
h=legend('');
h.visible = "off"
//------------------------------------------------------------------
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