Re: Fourier? (Q)
- To: mathgroup at smc.vnet.net
- Subject: [mg3608] Re: Fourier? (Q)
- From: hohmuth at cipserv1.physik.uni-ulm.de (Lars Hohmuth)
- Date: Thu, 28 Mar 1996 00:09:51 -0500
- Organization: Uni Ulm
- Sender: owner-wri-mathgroup at wolfram.com
In article <4j7hq8$af4 at dragonfly.wolfram.com> mrsma at uno.edu writes:
>From: mrsma at uno.edu
To: mathgroup at smc.vnet.net
>Subject: Fourier? (Q)
>Date: 26 Mar 1996 01:38:16 GMT
>greetings:
>when i tried to go through the Fourier examples as per pgs 679-681 in the Mma bible;
>Mma kindly returned the following:
>In[65]:=
>?Fourier
>Fourier[list] finds the discrete Fourier transform of a list
> of complex numbers.
>In[66]:=
>data={1,1,1,1,-1,-1,-1,-1}
>Out[66]=
>{1, 1, 1, 1, -1, -1, -1, -1}
>In[67]:=
>Fourier[data]
>Out[67]=
>Fourier[{1, 1, 1, 1, -1, -1, -1, -1}]
>i then tried the example on a PowerMac, NeXT, RS6000 and got the same reply.
>what am i missing here?
>sincerely,
>m. r.
You fell for the old
Mathematica-always-returns-the-exact-answer-if-fed-exact-numbers trap;-)
Try Fourier[N[{1,1,1,1,-1,-1,-1,-1}]] or Fourier[{1.,1.,1.,1.,-1.,-1.,-1.,-1,}]
Hope this helps,
Lars
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