How to change the default x-axis unit in a Bode diagram to Hertz?
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Rad/s is nice for mechanical people, but I'm an EE, and I much prefer Hertz. It should be something simple, but I can't find it in the help.
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dpb
2018년 9월 22일
Don't believe there is a way in the base routine; it's built entirely around rad/timeunits per the system object.
You could write a wrapper routine to convert frequency units and update the plot labels.
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Star Strider
2018년 9월 22일
It gives you that option, and the documentation specifically mentions that.
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Star Strider
2018년 9월 22일
편집: Star Strider
2018년 9월 22일
That is what I would do.
I defer to bodeplot because it allows some customization. I use and plot the bode outputs only if I want other options.
EDIT —
I add that this was my original recommendation!
추가 답변 (2개)
Tjeerd Ickenroth
2023년 5월 31일
Type 'ltiview' in your command window. The Linear System Analyzer will pop up. Click on: File --> Toolbox Preferences... --> Units --> Frequency: Hz
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Tjeerd Ickenroth
2023년 5월 31일
You need to change it once in the GUI and you always obtain bode plots in Hz. The setting remains even when you restart Matlab.
Dimitris Kalogiros
2018년 9월 22일
clc;close all; clc
% test system
s=tf('s');
H=(s-1)/((s-3)*(s-2))
% bode
[mag,phase,wout] = bode(H);
%plot results, with frequency expressed at Hz
figure;
subplot(2,1,1);
semilogx(wout(:,1)/(2*pi), 20*log10(squeeze(mag)), '-b'); zoom on; grid on;
title('magnitude'); xlabel('Frequency (Hz)'); ylabel('Magnitude (dB)');
subplot(2,1,2);
semilogx(wout(:,1)/(2*pi), squeeze(phase), '-r'); zoom on; grid on;
title('Phase'); xlabel('Frequecy (Hz)'); ylabel('Phase (deg)');
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Meth Hai
2024년 7월 15일
%%% G1 & and G2 is your TFs
[mag1, phase1, wout1] = bode(G1);
[mag2, phase2, wout2] = bode(G2);
% Convert angular frequency (rad/s) to frequency (Hz)
freq1 = wout1 / (2 * pi);
freq2 = wout2 / (2 * pi);
% Plot the magnitude response
figure;
subplot(2,1,1);
semilogx(freq1, 20*log10(squeeze(mag1)), '-b');
hold on;
semilogx(freq2, 20*log10(squeeze(mag2)), '-g');
grid on;
title('Magnitude');
xlabel('Frequency (Hz)');
ylabel('Magnitude (dB)');
legend('G1', 'G2');
%%%%%%%%%%%%
% Plot the phase response
subplot(2,1,2);
semilogx(freq1, squeeze(phase1), '-r');
hold on;
semilogx(freq2, squeeze(phase2), '-m');
grid on;
title('Phase');
xlabel('Frequency (Hz)');
ylabel('Phase (deg)');
legend('G1', 'G2');
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