How to plot a bode graph

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?

Answer 1

[Rahul Kalampattel]

Have a look at the documentation for semilogx and see if it helps...

Answer 2

[Star Strider]

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')

Answer 3

[Caitlin Jarvis]

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)

[Star Strider]

Quoting the original post:

‘I have values for the frequency, magnitude and phase but how do I then put them on a bode diagram?’