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MathGroup Archive 1999

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Re: Problem with the zero-term of Fourier[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19659] Re: Problem with the zero-term of Fourier[]
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 8 Sep 1999 02:24:11 -0400
  • Organization: Universitaet Leipzig
  • References: <7qsftj$17c@smc.vnet.net> <7r252g$6qt@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

with my Mathematica 4.0 on a SGI I can't reproduce the bug.

In[3]:=
(Plus @@ ixr)/Length[ixr]

Out[3]=
-0.338037

tmp = 1/Sqrt[Length[ixr]] Fourier[ixr] [[1]]
Abs[tmp]

Out[4]=
-0.338037 + 0. \[ImaginaryI]

Out[5]=
0.338037

Regards
  Jens


Hans Steffani wrote:
> 
> I placed my data, an a mathematica notebook at
> http://www.tu-chemnitz.de/~hfst/mathprob/
> 
> I tried to build an artificial example which is shorter but
> failed.
> 
> Perhaps anyone can help me.
> 
> h.f.s.
> --
> Hans Friedrich Steffani
> Institut fuer Elektrische Maschinen und Antriebe, TU Chemnitz
> mailto:hans.steffani at e-technik.tu-chemnitz.de
> http://www.tu-chemnitz.de/~hfst/


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