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