How can I plot transfer function?

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Tom le 27 Juin 2023
Commenté : Star Strider le 28 Juin 2023
Hi,How could I plot a transfer function (Magnitude (Amplitude),Phase) which has maybe complex zeros and poles. For example H=s/((s+1)*(s+2)).
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Star Strider le 28 Juin 2023
You can use the transfer function that you posted, if you define ‘s’ first, using the tf function.
If you want the magnitude and phase matrices, and frequency vectors, use bode, since it can produce all those, however it has llimited plotting interactivity. For more extensive plot options, use bodeplot
s = tf('s');
H=s/((s+1)*(s+2))
H = s ------------- s^2 + 3 s + 2 Continuous-time transfer function.
figure
bode(H)
grid
figure
h = bodeplot(H);
grid
opts = getoptions(h);
opts.FreqUnits = 'Hz';
setoptions(h,opts)
See the relevant function documentation for details.
.
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Tom le 28 Juin 2023
👍
Star Strider le 28 Juin 2023
As always, my pleasure!

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Plus de réponses (1)

ProblemSolver le 27 Juin 2023
To plot the magnitude and phase of a transfer function with complex zeros and poles in MATLAB, you can use the bode function.
% Define the transfer function
num = [1 0]; % Numerator coefficients for s
den = [1 3 2]; % Denominator coefficients for s
% Create the transfer function object
H = tf(num, den);
% Plot the magnitude and phase using the bode function
bode(H);
This code will generate a plot with two subplots: one for the magnitude (amplitude) and one for the phase response of the transfer function. The frequency range of the plot is determined automatically based on the system dynamics. You can customize the plot further by modifying the properties of the bode function. For example, you can specify a frequency range using the bode(H, w) syntax, where w is a vector of frequencies at which to evaluate the transfer function. Additionally, you can use the subplot function to create separate plots for magnitude and phase if you prefer individual plots rather than subplots.
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Tom le 28 Juin 2023

ProblemSolver

I wanna something like this...

Paul le 28 Juin 2023
which can be very simply achieved using the solution in this answer, with one modification.
bode w/o output arguments won't meet the need, but one can always use the output arguments and then plot manually.
[m,p] = bode(tf_model, frequency_range);
plot(frequency_range,db(abs(squeeze(m)))),grid % and similar for phase

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