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Hi !
Looking in the newsgroup about FFT, I think that a useful starting point could be a Guide
about fft present in the Matworks site:
http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=5654&objectType=fi le
This is a script where is reported how to evaluate FFT and IFFT of simple signal with
analytic results.

I hope this could be useful
bye

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