Change marker width in bode plot

2017 9 6
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更新时间：2017 9 6
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By default, the marker width of the bode plot is very large. There is an option to change the line width but no option to change the marker width? How can I change it ?

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Star Strider
Star Strider 2017-9-6

1 个投票

The bode function doesn’t accept many options with respect to its plots. The easiest way to do what you want is to request at least the first three outputs of the bode function, and then plot them using subplot and plot. The plots are the same as any other plot object:
[mag,phase,wout] = bode(sys);
subplot(2,1,1)
plot(wout, mag)
subplot*2,1,2)
plot(wout, phase)
Use ‘20*log10(mag)’ to plot the magnitude in decibels, and semilogx instead of plot to make the plot look like those bode produces on its own:
[mag,phase,wout] = bode(sys);
subplot(2,1,1)
semilogx(wout, 20*log10(mag))
subplot*2,1,2)
semilogx(wout, phase)

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sarita jain
sarita jain 2017-9-6
I did this
sys = tf([1],[1 3 2])
[mag,phase,wout] = bode(sys);
subplot(2,1,1)
plot(wout, mag)
subplot(2,1,2)
plot(wout, phase)
It is showing an error as follows
Error using plot
Data cannot have more than 2 dimensions.
Error in Delitaf (line 4)
plot(wout, mag)
Star Strider
Star Strider 2017-9-6
Since ‘mag’ and ‘phase’ are 3D arrays, use the squeeze function to remove the singleton dimension in ‘mag’ and ‘phase’ in a SISO system:
[mag,phase,wout] = bode(sys);
magv = squeeze(mag);
phasev = squeeze(phase);
figure(1)
subplot(2,1,1)
semilogx(wout, 20*log10(magv))
ylabel('Magnitude (dB)')
subplot(2,1,2)
semilogx(wout, phasev)
xlabel('Frequency (r/s)')
ylabel('Phase (°)')
sarita jain
sarita jain 2017-9-6
I need to have multiple bode plots on a single graph. How and where would I use
hold on
in the above case
Star Strider
Star Strider 2017-9-6
I am not certain what you want to do.
One possibility:
figure(1)
subplot(2,1,1)
semilogx(wout1, 20*log10(magv1))
hold on
semilogx(wout2, 20*log10(magv2))
semilogx(wout3, 20*log10(magv3))
hold off
ylabel('Magnitude (dB)')
subplot(2,1,2)
semilogx(wout1, phasev1)
hold on
semilogx(wout2, phasev2)
semilogx(wout3, phasev3)
hold off
xlabel('Frequency (r/s)')
ylabel('Phase (°)')
sarita jain
sarita jain 2017-9-6
Thanks a lot. I wanted to do this only.
Star Strider
Star Strider 2017-9-6
As always, my pleasure.

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