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hi every body. I want create a tranfer function like this

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super bad 2017-10-12

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评论： super bad 2017-10-12

在 MATLAB Online 中打开

              s + a
    Fnc =  ---------
             s^2 + b
    - a,b aren't symbol or string. (a,b) is the coefficient of (s).
    - Fnc can ( + , - ) with another tranfer function.
    - please help me if you can

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KL 2017-10-12

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编辑：KL 2017-10-12

what have you tried so far, super bad?

Star Strider 2017-10-12

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We’ve been through all this before: https://www.mathworks.com/matlabcentral/answers/359997-hi-i-want-creat-a-tranfer-function-have-parameter-but-i-don-t-know-how-to-do-it-help-me-pls#answer_284581 (link).

super bad 2017-10-12

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i did tried pretty, str2num to declared a,b but faile. i think we need declare a,b with double array type and use command ( tf ) to create Fnc

super bad 2017-10-12

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编辑：super bad 2017-10-12

@Star Strider: if use command pretty to create Fnc , we can't + , - Fnc with another tranfer function.

KL 2017-10-12

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Good, keep trying and follow the advices given to you on the other thread and post your question with more information. What happened when you tried? What was the error message or the unexpected output and so on. Good luck!

super bad 2017-10-12

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I do not think it's so hard for you because it only as colleges level.

KL 2017-10-12

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That is exactly why you should try it yourself.

Jan 2017-10-12

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编辑：Jan 2017-10-12

@super bad: It is confusing, if you open multiple threads for one question. Therefore I close this question now. Please proceed with the discussion in the other thread. Thanks.

super bad 2017-10-12