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