From: "Ken Davis" <ken.davis@sparta.com>
Path: news.mathworks.com!newsfeed-00.mathworks.com!webcrossing
Newsgroups: comp.soft-sys.matlab
Subject: Re: LMSE code for frequency response modeling
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Date: Tue, 24 Apr 2007 06:41:33 -0400
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"Abigail D" <abcdbba@gmail.com> wrote in message 
news:ef54bd6.-1@webcrossing.raydaftYaTP...
> Hi all,
>
> I'm working on identifying a transfer function model from the
> experimental frequency response data. Precisely, the data [F, Vin,
> Vout, Phase].
>
> I estimate a model initially using hand and then aim is to reduce the
> error between the modelled and experimental data for the
> corresponding frequency. i.e. minimizing the error between
> magnitude and phase data.
>
> For this purpose, I need to write an Matlab code for LMSE algorithm.
> As far as I see, there is no direct MATLAB code for frequency
> response modeling. Mostly it is for equations and time domain
> modeling.
>
> Can anyone help me in writing a Matlab code for the same. It will be
> of great help. I need very badly for my work ASAP.
>
> Any help is highly appreciated. Thanks in advance.
>
> Abigail

look at invfreqs in the signal processing toolbox.