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Is MATLAB giving a wrong root locus? Maybe a bug?

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Daniel Koslopp
Daniel Koslopp 2015-2-26
评论： Arjun Sheshadri 2019-4-18
Hello, I am trying to obtain a root locus with the following code which has 3 poles and 1 zero:
if true
clear all
close all
clc
num = [-0.1654 -0.0367]
den = [1 3.27 -20.23 -24.95]
rlocus(num,den)
axis([-10 10 -2.5 2.5])
end
The problem is that ML is giving me a strange result because it has a path on the right side of the biggest pole. The figure shows:
I tested in other software and it gave different results that seems more reasonable, like this one:
So, I am doing something wrong or it is a bug? My version is R2014a.

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Arkadiy Turevskiy
Arkadiy Turevskiy 2015-3-18
There is no error with your code or bug in MATLAB. It just seems you got the sign wrong. If you do rlocus(-num,den), you will get the root locus you expected to see.

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