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MathGroup Archive 2008

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FFT in Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg93648] FFT in Mathematica
  • From: Oliver <sch_oliver2000 at yahoo.de>
  • Date: Thu, 20 Nov 2008 04:56:23 -0500 (EST)

Hallo,

i wanted to plot the following function:

s(t) = (1/(4*(Pi*1*t)^(3/2))) * Exp[-(x^2 + y^2 + z^2)/(4*1*t)] 
when x=1, y=1, z=1
so i wrote: 

eq = (1/(4*(Pi*1*t)^(3/2))) * Exp[-(x^2 + y^2 + z^2)/(4*1*t)] 

Plot[Evaluate[eq /. {x -> 1, y -> 1, z -> 1}], {t, 0, 3}]

My Question is, how can i plot s(f), which is the function depending on the frequency. In other word, how to find the FFT of s(t) in Mathematica?
thanks.


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