how to find bode plot,phase magnitude plot and template in control system?

N
nelson · Jan 8, 2025 · 515 views
Question
z=1:0.5:10; a=1:0.5:5; num=kron(z,ones(1,length(a))); i=1:length(a); deno=zeros(9,3); deno(i,1)=1; deno(i,2)=a(i); den=repmat(deno,length(z),1); n=numel(num); for m=1:n sys(m)=tf(num(m),den(m,:)); end    
Expert Answer
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Neeta Dsouza PhD Expert
Answered Sep 10, 2026
This works, although you will have to plot 171 figures to see each of them with any detail. (You would have to have a very large monitor to see them all as the bode function plots them, since it plots an array of (2x171) subplots in one figure.)
 
The Code
 
[mag,phs,wout] = bode(sys);
Magnitude = squeeze(mag);
Phase = squeeze(phs);

figure(1)
subplot(2,1,1)
plot(wout,20*log10(Magnitude(1,:)))
title('Magnitude (dB)')
grid
subplot(2,1,2)
plot(wout,Phase(1,:))
title('Phase (°)')
grid
The ‘template’ is a Simulink function you will have to do yourself, since you have to specify how you want it.
 
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