Re: [R] waveform filtering

From: Huntsinger, Reid <reid_huntsinger_at_merck.com>
Date: Wed 21 Sep 2005 - 00:42:28 EST


fftw is a library to do FFTs (fast Fourier transform). It's excellent, but probably not necessary unless you have lots of long series and you use FFT's repeatedly (say in an iterative fitting procedure). R's fft() is essentially instantaneous for most one-shot applications.

Reid Huntsinger

-----Original Message-----
From: r-help-bounces@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of jfontain@free.fr Sent: Tuesday, September 20, 2005 10:32 AM To: R-help mailing list
Subject: Re: [R] waveform filtering

Quoting tom wright <tom@maladmin.com>:

> On Mon, 2005-19-09 at 10:36 -0400, tom wright wrote:
> > I'm not an engineer so I hope I'm using the correct terminology here. I
> > have a recorded waveform that I want to apply low and high pass filters
> > too, are tehre already R functions existing to do this or am I going to
> > have to program my own?
> > thanks for any pointers
> > tom
> >
> Thanks for the answers to this, after a little reading I realised that
> what sounded so simple wasnt quite. However chapters 15-18 of
> http://www.dspguide.com has been very useful.

Maybe you need a more specialized tool, such as FFTW? I found it by searching on "fourier" at www.freshmeat.net. Just an idea...

--
Jean-Luc

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Received on Wed Sep 21 02:30:56 2005

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