How to plot a bode graph

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Catherine Butler
Catherine Butler 2017-2-22
评论： Star Strider 2017-4-30
I need to plot a bode graph. I have values for the frequency, magnitude and phase but how do I then put them on a bode diagram?

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回答（3 个）

Rahul Kalampattel
Rahul Kalampattel 2017-2-22
Have a look at the documentation for semilogx and see if it helps...
Star Strider
Star Strider 2017-2-22
Use the subplot function:
figure(1)
subplot(2,1,1)
plot(frequency, magnitude)
grid
xlabel('Frequency (Hz)')
ylabel('Magnitude')
subplot(2,1,2)
plot(frequency, phase)
grid
xlabel('Frequency (Hz)')
ylabel('Phase')
Caitlin Jarvis
Caitlin Jarvis 2017-4-30
if you have the transfer function than you can enter it in and plot directly from that.
for example for (2s^2+4s+1)/(s+1) where s=jw, you enter the transfer function like this:
G=tf([2,4,1],[1,1])
and then plot using: bode(G)
  1 个评论
Star Strider
Star Strider 2017-4-30
Quoting the original post:
‘I have values for the frequency, magnitude and phase but how do I then put them on a bode diagram?’

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