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[Octave-bug-tracker] [bug #53164] Incorrect Nyquist plot

From: anonymous
Subject: [Octave-bug-tracker] [bug #53164] Incorrect Nyquist plot
Date: Thu, 15 Feb 2018 09:52:25 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36


                 Summary: Incorrect Nyquist plot
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 15 Feb 2018 02:52:24 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Tomasz Sokolowski
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Microsoft Windows



I tried to get Nyquist plot of a system descripted with equation:
I tried it on locally installed Octave and Octave online with same results.
The code I used is:

octave:1> s=tf('s')
octave:2> sys=1/(s*(s+1)^2)
octave:3> nyquist(sys)

I tried also "sys=tf([1],[1 2 1 0])" but with the same result.
In the attachment there is the result from Octave. Here is the correct result
from wolfram alpha:


File Attachments:

Date: Thu 15 Feb 2018 02:52:24 PM UTC  Name: octave-online-line-5.png  Size:
32KiB   By: None



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