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Hi. I want creat a tranfer function have parameter,but i don't know how to do it.help me pls

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super bad
super bad 2017-10-6
评论： Walter Roberson 2017-10-9
a*s + 3
--------------
s^2 + b*s + c

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Robert U
Robert U 2017-10-6
Hi super bad,
have a look into the matlab function "tf":
https://de.mathworks.com/help/control/ref/tf.html
Kind regards,
Robert
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Robert U
Robert U 2017-10-9
Just saw the discussion below. My answer comprises a function file. Star Strider gave it already as anonymous function.
Kind regards,
Robert
Walter Roberson
Walter Roberson 2017-10-9
MATLAB cannot create a transfer function that displays like
a s + 3
--------------
s^2 + b s + c
with literal characters 'a' and 'b' and 'c' showing up, except as a symbolic expression like Star Strider shows.
If particular numeric values are to be substituted, so it might for example show up as
5 s + 3
--------------
s^2 - 2 s + 17.1
then that can be done with the methods Robert or Star Strider show.

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更多回答（2 个）

Star Strider
Star Strider 2017-10-6
If you are creating a ‘tunable’ system, see the documentation on the realp (link) function.
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Star Strider
Star Strider 2017-10-6
You never mentioned that as a specific requirement before.
What you want to do is not possible other than in the Symbolic Math Toolbox:
syms a b c s
sys = (a*s + 3)/(s^2 + b*s + c)
pretty(sys)
a s + 3
------------
2
s + b s + c
Stopping here.
Again, Good luck!

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Walter Roberson
Walter Roberson 2017-10-7

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