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MathGroup Archive 2004

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Re: fourier ( FFT )

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52108] Re: fourier ( FFT )
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 11 Nov 2004 04:52:10 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <cmso6o$b4g$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Fourier[] assume that your data equaly spaced sampled on the interval
[0,2Pi). You can construct an interpolation function and resample the
data.

Regards
  Jens

<bar at ANTYSPAM.ap.krakow.pl> schrieb im Newsbeitrag 
news:cmso6o$b4g$1 at smc.vnet.net...
> Hi
>
> My file has form:
> x1  f(x1)
> x2  f(x2) ....
>
> How can I use Mathematica to obtain frequencies ?
>
> Fourier[] works on only one list!
>
> When i tested with f(x)=Sin[a x] sometimes
> i obtained wrong result.
>
>
> regards, Olaf
> 



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