[Octave-bug-tracker] [bug #45918] control: Nyquist plot is incorrect

[Lukas Reichlin]

Follow-up Comment #3, bug #45918 (project octave):

I don't get it. There is no zero-pole cancellation due to the negative sign.


octave:17> sys = tf([-10 10], [1 1 0])

Transfer function 'sys' from input 'u1' to output ...

      -10 s + 10
 y1:  ----------
       s^2 + s  

Continuous-time model.
octave:18> [z, k] = zero (sys)
z =  1
k = -10
octave:19> pole (sys)
ans =

  -1
   0

octave:20> sysmin = minreal (sys)

Transfer function 'sysmin' from input 'u1' to output ...

      -10 s + 10
 y1:  ----------
       s^2 + s  

Continuous-time model.
octave:21> 



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