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fourier transform


Hi folks
           I have a list of pairs of numbers like

  {{1.2, 3.4}, {2.2, 3.6}............}
The first part is time and second part is amplitude.

when I do the fourier transform by using
Fourier[list]

it gives me list of complex numbers but I expect real numbers
(i.e . amplitude versus frequency)


Any help appreciated.

thanks
-- 
Masrur Hossain


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