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MathGroup Archive 2002

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Re: FourierTransform problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35098] Re: FourierTransform problem
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 25 Jun 2002 03:39:38 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <af6hts$ll4$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

FourierTransform[] is a build-in command in version 4.x
and you will not get the source code of a build-in function.

Regards
  Jens

David Turner wrote:
> 
> Hello,
> 
> I am using Mathematica for Students 3.0.1 with Windows 98.  When I execute
> the following code, I get the error messages below:
> 
> In[1]:=
> <<Calculus`FourierTransform`
> 
> In[2]:=
> Clear[fx, fw, a]
> 
> In[3]:=
> a:=1
> 
> In[4]:=
> fx[x_]:=Exp[-Abs[x*a]]
> 
> In[5]:=
> fw[w_]:=InverseFourierTransform[fx[x], x, w]
> 
> In[6]:=
> Plot[fw[w], {w, -5*a,5*a}]
> 
> Plot::plnr : fw[w] is not a machine-size real number at w = -5..
> Plot::plnr : fw[w] is not a machine-size real number at w = -4.59433..
> Plot::plnr : fw[w] is not a machine-size real number at w = -4.15191..
> General:: stop : Further output of Plot::plnr will be suppressed during this
> calculation.
> 
> Does anyone know where I might obtain a corrected FourierTransform.m package
> for Mathematica 3.0.1?  My copy is dated 7/21/97.  I contacted Wolfram about
> this matter.  However, they told me they no longer support version 3.0.  I
> appreciate any help you may provide.
> 
> Thanks.
> 
> David


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