Students of the subject
“Control Systems” can use GNU Octave for practising Matlab code.
Following
is an example of a simple session while using Octave version 3.6.3
under a Fedora 17 installation.
BODE PLOT
Example
1:
System: (1 + s)
octave:1>
sys1 = tf([1 1],[1])
Transfer
function 'sys1' from input 'u1' to output ...
y1: s + 1
Continuous-time
model.
octave:2>
bode(sys1)
octave:5>
The
resulting plot:
Example 1:
System: 30/(1 + 0.5s)(s
+ 1)(s + 5)
octave:13>
[numer, denom] = zp2tf([],[-2 -1 -5], 60)
numer
= 60
denom
=
1 8 17 10
octave:14>
sys2 = tf(numer, denom)
Transfer
function 'sys2' from input 'u1' to output ...
60
y1: -----------------------
s^3 + 8 s^2 + 17 s + 10
Continuous-time
model.
octave:16>
close all
octave:17>
bode(sys2)
octave:18>
The
resulting plot:
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