Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2000
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2000

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Fast Fourier Transforms

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21635] Re: Fast Fourier Transforms
  • From: cs106 at waii.com (Randy Winney)
  • Date: Tue, 18 Jan 2000 02:35:20 -0500 (EST)
  • Organization: Western Geophysical
  • References: <85p7u3$6je@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <85p7u3$6je at smc.vnet.net>, "Burton" <Ctheurer at ecs.umass.edu> writes:
|>     I am doing some analysis of acoustic data obtained from a pickup located
|> on a machine.  The data is in the form of ordered pairs i.e. Time and
|> voltage.  As far as I know fft in Mathematica only operates on a list of
|> single numbers.  I have imported the voltage data (since the time is simply
|> incremental) and performed an fft on that successfully.  My problem lays in
|> interpreting this data.  I don't understand how to scale the x-axis of the
|> fft plot to represent frequency.
|>     Any suggestions would be appreciated.

My guess would be DC (0 Hz) to Nyquist (1/(2 * temporal_sample_rate_in_seconds))

--
Randy Winney                                   randy.winney at westgeo.com
Seismic Processing Software Development        713.689.2487
Western Geophysical
10001 Richmond Ave., Houston, TX 77042


  • Prev by Date: Re: Series expansion of ArcSin around 1
  • Next by Date: Exact Kolmogorov Test Distribution; Computing Times
  • Previous by thread: Fast Fourier Transforms
  • Next by thread: Re: Fast Fourier Transforms