can matlab generate transfer function automatically??

Has matlab code any facility ,where transfer function is obtained directly . we have some code and i need to find transfer function for that.

[Kaustubha Govind]

It looks like you need something like the System Identification toolbox, but that product is for Simulink models, not MATLAB code.

[Milan]

Is this applicable for state flow

Answer 1

[Shashank Prasanna]

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:

http://www.mathworks.com/help/ident/ref/tfest.html

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) :

http://www.mathworks.com/help/slcontrol/ug/linearize.html

Answer 2

[David Sanchez]

It all depends on your data.

Take a look at matlab's help:

help tf

or:

doc tf

[Milan]

I dont have coefficient i have bunch of codes

[Milan]

i have bunch of code and i need to find the transfer function for it

[Rajiv Singh]

Hi Milan,

What do you mean by "bunch of code"? Is this referring to input/output measurements, or some representation of its frequency response? Or, does the code represent a system of equations?

[Milan]

Bunch of code means code mean matlab script

[Arkadiy Turevskiy]

With answers like that you are not going to get much help. Can you paste your code here?

[Milan]

code is of thousands of line , is there any command which calculate transfer function of electrical circuit which is bulid in PSIM

[Arkadiy Turevskiy]

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.