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From: "Rajiv Singh" <rajiv_singh@msn.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Convert frequency response data to simulink block
Date: Thu, 4 Sep 2008 12:14:59 -0400
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Hi Ben,
Could you outline your steps with using System Identification Toolbox? It 
should be possible to represent your data using IDFRD object and then create 
a transfer function from it using functions such as PEM and OE.

Rajiv

"Ben Wu" <wushizhang@gmail.com> wrote in message 
news:g9p0rm$o6j$1@fred.mathworks.com...
>> maybe firls could be of help
>
> thanks.
> you mean the function "firls"?