How do I get a vector with the coefficients from a transfer function?

2016 9 26
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更新时间：2016 9 26
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I tried to use the coeffs function, but it's not compatible with tfs
I've this tf:
s = tf('s');
f = s^2 + 2.673 s + 49.92;
It seems simple, but which function can I use to get a vector with the coefficients [1 2.673 49.92]?

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Massimo Zanetti
Massimo Zanetti 2016-9-26
编辑：Massimo Zanetti 2016-9-26

4 个投票

Hi Lara,
the tf you generate is a structure and it stores the information you need in the NUM cell. To get your coefficient vector access the NUM cell like this:
s = tf('s');
f = s^2 + 2.673*s + 49.92;
A = tf(f).num{:};
Now, vector A is what you need. :)

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