How to solve a trasfer function absolute value whit the tf function command.

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Graz Mand 2013-8-20

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回答： Negin Abaeian 2015-12-12

I'm tryng to implement a control system method in matlab but I have a problem in plotting a curve so I don't find a solution to compute the absolute value of a tranfer function declared with the classical command "tf". The function "abs()" is not useful so I ask you which the way to solve the problem. Thank you so much.

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Graz Mand 2013-8-20

Not mathematically! I'm tryng to implement a control system method but the curves I want to plot, are in function of the absolute value of other functions.

I want to plot, for example C1=|P1|/(1-|P2|);

the problem is that P1 e P2 are transfer function too! Please help me! It's important for my work..

Graz Mand 2013-8-20

If I want to plot the Bode diagram of P1 or P2 is not a problem, but that's for C1..

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回答（2 个）

Azzi Abdelmalek 2013-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/85165-how-to-solve-a-trasfer-function-absolute-value-whit-the-tf-function-command#answer_94661

在 MATLAB Online 中打开

Example

N=1;
D=[1 10]
model=tf(N,D)  % your transfer function

Now what do you mean by: An absolute value of a transfer function

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Graz Mand 2013-8-20

编辑：Graz Mand 2013-8-20

Anyways with p or w the plot of P1 results the same one..

Azzi Abdelmalek 2013-8-20

编辑：Azzi Abdelmalek 2013-8-20

在 MATLAB Online 中打开

It's not f=P1/(1-P1) but

f=P1./(1-P1)
plot(w,f)

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Negin Abaeian 2015-12-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/85165-how-to-solve-a-trasfer-function-absolute-value-whit-the-tf-function-command#answer_202991

Hey Graz.

I can see the post belongs to long ago. But did you ever find the answer to this question? I'm trying to plot the exact same transfer function for an Audio application.