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## Re: Control System Design methods using Octave.

 From: shall689 Subject: Re: Control System Design methods using Octave. Date: Wed, 6 Dec 2017 16:30:46 -0700 (MST)

```I updated my code to use the 1/SampleFrequency in the tf() function.  It
seems to give me much better results.

The code in my last post had n am m values for invfreqz() that were not
related to my previous post.  I had been playing around with those values to
see if I could get a bode plot that was closer to the bode plot generated
from the PSIM simulation frequency sweep.   The code below uses the n and m
values I had in my original code.  How do I decide the n and m value --- by
trial and error?

Stephen

pkg load control;
pkg load signal;
clear all
x = csvread('buckVfreqResp.csv');
SampleFrequency = 20000;
T = 1/SampleFrequency;
f = x(:,1);
r = x(:,2);
phase_rad = x(:,3).*(pi/180);
h = r.*cos(phase_rad) + r.*(sin(phase_rad)*i);
w = f.*(2*pi*T);
[b,a] = invfreqz(h,w,2,3)
sys = tf(b,a)
bode(sys)

--
Sent from: http://octave.1599824.n4.nabble.com/Octave-General-f1599825.html

```

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