can matlab generate transfer function automatically??

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Has matlab code any facility ,where transfer function is obtained directly . we have some code and i need to find transfer function for that.
  2 Comments
Kaustubha Govind
Kaustubha Govind on 8 Jul 2013
It looks like you need something like the System Identification toolbox, but that product is for Simulink models, not MATLAB code.

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Answers (2)

Shashank Prasanna
Shashank Prasanna on 8 Jul 2013
MATLAB may not be able to read "bunch of code" to give you a transfer function but if you have input and output data from the system you are trying to model (maybe by executing the bunch of codes) you can use TFEST to estimate the transfer function:
If you have it in a simulink block then you can linearize it across the input and output port to obtain a state space model (and hence the tf) :

David Sanchez
David Sanchez on 4 Jul 2013
It all depends on your data.
Take a look at matlab's help:
help tf
or:
doc tf
  7 Comments
Milan
Milan on 11 Jul 2013
code is of thousands of line , is there any command which calculate transfer function of electrical circuit which is bulid in PSIM
Arkadiy Turevskiy
Arkadiy Turevskiy on 11 Jul 2013
Edited: Arkadiy Turevskiy on 11 Jul 2013
Is the circuit modeled in PSIM a linear system?
Here is what I would suggest:
In PSIM create a few input-output data sets, i.e., run different input signals (steps, random noise, chirp signals) through the model and record both input and output signals. Export that input-output data to MATLAB, and use System Identification Model to estimate a transfer function.
Check out the short videos on this page showing how to do this.

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