MATLAB Answers

How to plot a bode graph

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Catherine  Butler
Catherine Butler on 22 Feb 2017
Commented: Star Strider on 30 Apr 2017
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?

Answers (3)

Rahul Kalampattel
Rahul Kalampattel on 22 Feb 2017
Have a look at the documentation for semilogx and see if it helps...

Star Strider
Star Strider on 22 Feb 2017
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 on 30 Apr 2017
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 Comment
Star Strider
Star Strider on 30 Apr 2017
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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