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