| Re: double Fourier Fit [message #47662] |
Mon, 27 February 2006 06:27 |
K. Bowman
Messages: 330
Registered: May 2000
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Senior Member |
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In article <1140999960.128895.55810@i39g2000cwa.googlegroups.com>,
"Maria" <mayte.vasquez@gmail.com> wrote:
> Hi All,
> I would like to make a Double Fourier Fit to some high fluctuating
> magnetic field data. I didn't find any online IDL help in regards. If
> anyone knows, Please guide me to some IDL help posted online or to some
> DFF documentation.
> Thank you.
> Maria
I'm not sure what you mean by a double Fourier fit. Do you mean the FFT of a
2-D array?
If so, the built-in IDL FFT will automatically handle arrays of any dimension.
I urge you to create an input array with known characteristics (e.g., sum a few
Fourier components of with specified wavenumber, amplitude, and phase). Then
study the resulting FFT. I find that to be the best way to sort out how IDL
organizes the FFT components.
There is a chapter on the 1-D FFT in my book (http://idl.tamu.edu/).
Cheers, Ken Bowman
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