Problems with plot in GNU Octave

Hello, my name is Blanca Tonda.
I am having problems with plotting some diagrams, when I write plot(tiempo, control), for example, there is no graph showing.
Should I do something else or is it the version?
By the way, I have the GNU Octave 6.2.0 version.

Thanks for your help.
Sincerely.
Blanca T.

Does

plot(1:10)

work for you?