Does anybody here know if there's a name for the "ordinary" root locus plot that one gets dragged through in control engineering school? I mean the one where you have the sum of a polynomial plus a polynomial times a constant, i.e. it's linear in the parameter being varied.
Just "root locus" plot won't do, because you can have a polynomial that isn't linear in the parameter and make a perfectly nice little plot, you just can't flog the subject endlessly until your students can draw plots by hand in their sleep for systems with 10 poles and 5 zeros or whatever other perverse variations your sadistic mind can dream up.
And yes, almost nobody uses them in control design. I'm presenting them because it's a handy way to understand certain compensation schemes and because its a very powerful way of visualizing what happens to your system stability when you vary some parameter.