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Science Forum Index » Mathematics Forum » Frequency table for discrete Fourier transformation
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Message |
| Daniel Kraft |
 Posted: Tue Apr 29, 2008 5:21 am |
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Guest
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Hi,
I want to do a numerical differentiation (function given by a table)
using a Fourier transformation, something like this:
d/dx f = ifft(i*omega*fft(f)),
where ifft and fft denote inverse/forward Fourier transformation and f
is the table of function values.
The only problem is, I don't know how I get the table omega of frequency
values associated with their coefficients in the output of fft(f).
Unfortunatelly, there seems to be nearly no mention on the use of DFT's
for numeric differentiation out there, as I didn't find anything useful
on google...
Can someone explain to me how I can get the frequency-table itself along
with the coefficients?
Thank you very much,
Daniel
--
Done: Bar-Sam-Val-Wiz, Dwa-Elf-Hum-Orc, Cha-Law, Fem-Mal
Underway: Ran-Gno-Neu-Fem
To go: Arc-Cav-Hea-Kni-Mon-Pri-Rog-Tou |
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