Given the transfer function
G = 1/s^3
We should see a constant negative phase of -270°, which is confirmed in matlab

However, both control.bode and control.matlab.bode give 90° instead of -270°. Although technically the same value, it does get confusing.

import control
import control.matlab
s = control.tf('s')

G = 1/s**3

control.bode(G);

control.matlab.bode(G);

What i've tried so far

• using different transfer functions (1/s^4 or 1/s^2 * 1/(s+10))
• specifying "omega" with a frequency range (as suggested here : https://ch.mathworks.com/matlabcentral/answers/99531-why-is-the-phase-that-is-returned-by-the-bode-function-wrapping-in-the-control-system-toolbox-5-1-r )
• extending the "omega" range

Is it possible to get the "absolute" phase of the transfer function ? If not, i would suggest that control.matlab.bode be corrected as to reflect the behavior of matlab's bode

Thanks for your help !