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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 |
URL: <http://savannah.gnu.org/bugs/?53164> 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 _______________________________________________________ Details: I tried to get Nyquist plot of a system descripted with equation: 0.5/(s*(1+s)^2) 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: https://www.wolframalpha.com/input/?i=nyquist+(0.5%2F(s*(1%2Bs)%5E2)) _______________________________________________________ File Attachments: ------------------------------------------------------- Date: Thu 15 Feb 2018 02:52:24 PM UTC Name: octave-online-line-5.png Size: 32KiB By: None <http://savannah.gnu.org/bugs/download.php?file_id=43328> _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?53164> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
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