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MathGroup Archive 2003

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Fourier bug

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39768] Fourier bug
  • From: Nigel King <king at dircon.co.uk>
  • Date: Fri, 7 Mar 2003 03:29:58 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

The result of a Fourier transform is a list which does not manipulate 
correctly
In[1]:=
$Version
Out[1]=
"4.0 for Power Macintosh (April 20, 1999)"
In[2]:= freq = Fourier[{1 + 2I}]; freqSave = 0.5freq; freq[[1]] = 0.5*
freq[[1]]; freqSave - freq
   Out[5]=
{0.\[InvisibleSpace] + 0.5 \[
ImaginaryI]}

The result should be O. + 0. I

Is this a known bug or am I doing something wrong. I have minimised the 
above code to locate the error which seems to be as a result of the 
Fourier.

Nigel King


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