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# Use logarithms to separate the frequency response into a sum of decibel terms, where w=0 to find the starting magnitude.

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Salik Mallick on 15 Apr 2020
Answered: Rhea Chandy on 7 May 2021
Is there a function to find the gain?
6
H(s)= ----------------------------------------
s^5 + 22 s^4 + 164 s^3 + 458 s^2 + 315 s
code:
h=tf(num,den4)
[gm pm wcp wcg]=margin(h)
km=10*(gm/20)
wm=wcp
kp=0.6*km
ki=(kp*wm)/pi
kd=(kp*ki)/(4*wm)
h1=tf([1,0],[1])
g=(kp+(kd*h1)+(ki/h1))*h
bode(g)
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### Answers (1)

Rhea Chandy on 7 May 2021
Hi, I understand you want to find the gain of your transfer function.
Consider using the Zero-pole-gain model , zpk, to convert your dynamic system models to zero-pole-gain form. You can access the gain data with zpkdata .
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