*Post by Stefano Milani*I would like to create a polar plot of a polinomy using maxima.

This plot must is obtained in matlab eith this command

polar(angle(PolCar), log(abs(PolCar)))

It's not clear what you want to plot here. I gather that the Mikhailov

criterion has to do with the sign of the real part of the roots of a

polynomial. Are you trying to plot the locations of the roots in the

complex plane?

But I see there is also the possibility of plotting P(%i*omega) where

omega is a real variable, from 0 to +inf, and %i is the imaginary unit.

(See: https://www.encyclopediaofmath.org/index.php/Mikhailov_criterion)

If so maybe something like

draw2d (polar (P(%i*omega), omega, 2*%pi));

is a place to start. ? polar gives some information about that.

A link to an example of what you wish to do would help us understand

better.

best,

Robert Dodier