Actually I do use DWT for features extraction which is aimed at clustering signals bearing statistically comparable patterns. 
Trend can easily fool any clustering function. This is why detrending is the number 1 step in the whole procedure.
Sparing the quasi-harmonic components that bear most of the information is a must.
I am interested at sparing the quasi-periodic oscillations that, otherwise, would be wiped out by the detrending procedure.
Thanks,
Maura

-----Messaggio originale-----
Da: stephen sefick [mailto:ssefick@gmail.com]
Inviato: gio 28/05/2009 0.56
A: mauede@alice.it
Cc: r-help@stat.math.ethz.ch
Oggetto: Re: R: [R] Harmonic Analysis
 
Do you need time localization, or are you only interested in the
period of the high frequency?  If you do need time localization why
not use a CWT to look at the signal?

Stephen

On Wed, May 27, 2009 at 4:59 PM,  <mauede@alice.it> wrote:
> Well, the time series I am  dealing with are non-linear and not-stationary.
> Maura
>
> -----Messaggio originale-----
> Da: r-help-bounces@r-project.org per conto di stephen sefick
> Inviato: mer 27/05/2009 14.58
> A: r-help@stat.math.ethz.ch
> Oggetto: Re: [R] Harmonic Analysis
>
> why will a fourier transform not work?
> 2009/5/27 Uwe Ligges <ligges@statistik.tu-dortmund.de>:
>>
>>
>> Dieter Menne wrote:
>>>
>>>  <mauede <at> alice.it> writes:
>>>
>>>> I am looking for a package to perform harmonic analysis with the goal of
>>>> estimating the period of the
>>>> dominant high frequency component in some mono-channel signals.
>>>
>>> You should widen your scope by looking a "time series" instead of
>>> harmonic
>>> analysis. There is a task view on the subject at
>>>
>>> http://cran.at.r-project.org/web/views/TimeSeries.html
>>
>>
>> ... or take a look at package tuneR.
>>
>> Uwe Ligges
>>
>>
>>
>>
>>> Dieter
>>>
>>> ______________________________________________
>>> R-help@r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
> Stephen Sefick
>
> Let's not spend our time and resources thinking about things that are
> so little or so large that all they really do for us is puff us up and
> make us feel like gods.  We are mammals, and have not exhausted the
> annoying little problems of being mammals.
>
>                                                                 -K. Mullis
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
>
> Alice Messenger ;-) chatti anche con gli amici di Windows Live Messenger e
> tutti i telefonini TIM!

er



-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis




tutti i telefonini TIM!


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