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Reply-To: "Nasser Abbasi" <nma@12000.org>
From: "Nasser Abbasi" <nma@12000.org>
Newsgroups: comp.soft-sys.matlab
References: <gi9jor$97e$1@fred.mathworks.com>
Subject: Re: spectral analysis
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Date: Wed, 17 Dec 2008 00:39:29 -0800
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"george " <qwerty6542@yahoo.gr> wrote in message 
news:gi9jor$97e$1@fred.mathworks.com...
> how can i do spectral analysis in one signal which have a preproccessing 
> in fourier?

"fourier" is a name of a person, so it should really be "Fourier"

As for the question itself, you can start, as was suggested, with

                      google "matlab Fourier spectral"

Results 1 - 10 of about 130,000 for matlab Fourier spectral. (0.17 seconds)

--Nasser