The Root locus is the locus of the roots of the characteristic equation by varying system gain K from zero to infinity.
https://lpsa.swarthmore.edu/Root_Locus/RootLocus.html
https://www.tutorialspoint.com/control_systems/control_systems_construction_root_locus.htm
https://www.youtube.com/watch?v=CRvVDoQJjYI&list=PLUMWjy5jgHK3-ca6GP6PL0AgcNGHqn33f&index=1
https://www.youtube.com/watch?v=pG3_b7wuweQ&list=PLUMWjy5jgHK3-ca6GP6PL0AgcNGHqn33f&index=7
clc;
clear all;
pkg load control;
s = tf('s');
Gw = ((-0.02016*s^2)+(-10.59*s)+(1266))/((1*s^2)+(46.21*s)+(-1.674*(e^-12)))
Incremento = 0.02;
Minimo = 0;
Maximo = 5;
rlocusx(Gw, Incremento, Minimo, Maximo);