How to define transfer function as function in s

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Bandar 2020-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/612091-how-to-define-transfer-function-as-function-in-s

回答： Rohit Pappu 2020-10-29

In control systems, we use transfer functions a lot. One way to define transfer function is merely to use tf(). For example, we could define such transfer function as

s=tf('s');
G=(s+1)/(s+3);

But what I would like to do is to define G as G(s) without explicitly defining the underlying transfer function and treat it as transfer function so that I can use Control Toolbox (i.e. feedback(), series(), parallel(),...,etc) to carry out some manipulations. How one can achieve this ?

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Star Strider 2020-10-17

I realise that. The point is that you can do the symbolic manipulations in the Symbolic Math Toolbox and then manually express the results as Control System Toolbox objects.

Bandar 2020-10-22

I have to use some Control systems toolbox functions.

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回答（1 个）

Rohit Pappu 2020-10-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/612091-how-to-define-transfer-function-as-function-in-s#answer_528043

Functions like feedback() , series() etc, take in dynamic system models as input arguments. Additional information about dynamic system models can be found here