Whis my root locus plot showing me a blank figure?

This my code:

sys = tf([2 5 1],[1 2 3]);

rlocus(sys)

I get a blank screen with a heading of "Figure 1"

Answer 1

[Star Strider]

It works here and in MATLAB Online for me --

sys = tf([2 5 1],[1 2 3]);
rlocus(sys)

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