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[Octave-bug-tracker] [bug #41154] Rlocus function axis graduation not op
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #41154] Rlocus function axis graduation not optimal |
Date: |
Wed, 08 Jan 2014 22:15:13 +0000 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0 |
URL:
<http://savannah.gnu.org/bugs/?41154>
Summary: Rlocus function axis graduation not optimal
Project: GNU Octave
Submitted by: None
Submitted on: Wed 08 Jan 2014 10:15:12 PM UTC
Category: Octave Forge Package
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Performance
Status: None
Assigned to: None
Originator Name: Saul Mtakula
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release: 3.6.4
Operating System: Microsoft Windows
_______________________________________________________
Details:
The code down below generates a root locus (control 2.4.2) with axis
graduations that are not clear especially compared to results from Matlab or
Scilab. The attached screenshot illustrates what I mean.
clear
clc
pkg load control
s = tf('s');
% Polynomial seed
Gain1 = (s^2+20*s+100)/(s^2+6*s+100);
Gain2 = Gain1*(s^2+3*s+220)/(s^2+25*s+225);
Gain3 =(s+5)/(s*s*(s-2000)*(s-200)*(s-25)*(s-1));
Gain4 = 352*Gain3;
%
%Bode plot:
%---------------
subplot(221)
bodemag(Gain2,Gain1,0.01,100)
% Magnitude plot
%
%Nyquist plot:
%-------------------
subplot(222)
nyquist(Gain2,Gain1)
% Plot with Re and Im axes
%Nichols chart (Black's diagram + iso-plots):
%-------------------------------------------------------------
subplot(223)
nichols(Gain2,Gain1,0.01,100)
%
%Evans root locus:
%-------------------------
subplot(224)
rlocus(Gain4) %,0100) %,100)
% Evans root locus for sys4
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Wed 08 Jan 2014 10:15:12 PM UTC Name: octave_root_locus.png Size:
193kB By: None
<http://savannah.gnu.org/bugs/download.php?file_id=30227>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?41154>
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