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Fourier Transform Graph Coordinates

  • To: mathgroup at smc.vnet.net
  • Subject: [mg95022] Fourier Transform Graph Coordinates
  • From: DAVID FOURIE <david.fourie at newcastle.ac.uk>
  • Date: Sat, 3 Jan 2009 05:56:02 -0500 (EST)

Hi all,

I am wanting to compare Fourier Transform graphs in a Java Program. For thi=
s I need the coordinates, or graph points of the created Fourier Transform =
graph.

For example using the Mathematica example:

        In[]:=  Fourier[{-1,-1,-1,-1,1,1,1,1}]
        Out[]:= {0.\[InvisibleSpace] + 0. \[ImaginaryI], -0.707107 - 1.70=
711 \[ImaginaryI], 0.\[InvisibleSpace] + 0. \[ImaginaryI], -0.707107 - 0.29=
2893 \[ImaginaryI], 0.\[InvisibleSpace] + 0. [ImaginaryI], -0.707107 + 0.29=
2893 \[ImaginaryI], 0.\[InvisibleSpace] + 0. \[ImaginaryI], -0.707107 + 1.7=
0711 \[ImaginaryI]}

        In[]:=  ListPlot[Abs[Fourier[{-1, -1, -1, -1, 1, 1, 1, 1}]],
        Out[]:= A zig zag graph.


I want the coordinates of this graph. I have tried exporting it as a table =
but it is indecipherable. Idealy the graph would be in the style:
X       Y
1       10
2       23
3       24
4       27
5       31

Etc

The style is not the concern though it is just getting the data which gener=
ates the graph.

Yours



David Fourie BSc Computer Science
David.fourie at ncl.ac.uk
MPhil Computational Neuroscience
D809
ext - 8593


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