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Re: Fourier frequencies

  • To: mathgroup at
  • Subject: [mg43457] Re: Fourier frequencies
  • From: "Robert Nowak" <robert.nowak at>
  • Date: Wed, 17 Sep 2003 07:59:30 -0400 (EDT)
  • References: <bk6imh$gqp$>
  • Sender: owner-wri-mathgroup at

if you have equaly spaced samples x={x1,x2,x3......xn} you simply apply
Fourier[x] the result you get is {f1,f2,f3,....fn} where f1 gives the
constant term f2,fn give the basic frequency, f3,fn-1 give the harmonic with
twice the basic frequency and so on, ...
if you have unevenly spaced samples s={{t1,x1},{t2,x2},.....{tn,xn}} then
you will have to do some nonlinaer fitting, perhaps using NonliearFit[]

regards robert

"akpovo" <akpovo at> wrote in message
news:bk6imh$gqp$1 at
> Hello to all,
> How possible is it to compute a fourier transform of a data set {t,x} in
> order to have the fourier coefficient and the corresponding frequency?
> Tahnks

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