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Re: Fourier transform

  • To: mathgroup at
  • Subject: [mg43490] Re: Fourier transform
  • From: "Robert Nowak" <robert.nowak at>
  • Date: Thu, 18 Sep 2003 05:38:53 -0400 (EDT)
  • References: <bk9jb2$t8b$>
  • Sender: owner-wri-mathgroup at

hopefuly im not wrong but i think there exist at least two spektra
i.)  the amplitude spektrum A
ii.) the power spektrum P
with simply P=A*A

so you might just try:


regards robert

"Ch akpovo" <akpovo at> wrote in message
news:bk9jb2$t8b$1 at
> I'm using Time Series Package and I noticed that there is a difference
> between the power spectrum computed from the command Spectrum[] and that
> using Abs[Fourier[]. I would like to know why that difference and which
> method is the best as far as deriving the energy (parseval's theorem)
> carried in the data is concerned.
> Can anyone help?
> --
> ch akpovo
> Laboratory for Modern Fluid Physics
> Florida A & M University
> Phone: 850 561 2473
> Fax: 850 561 2474

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