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Re: IDL code for multi-dimensional FFT analysis
| Re: IDL code for multi-dimensional FFT analysis [message #12153] |
Tue, 30 June 1998 00:00 |
wmc
Messages: 117
Registered: February 1995
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Senior Member |
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Charlotte DeMott <demott@summit.atmos.colostate.edu> writes:
> I know I've seen this question asked before, so hopefully
> someone can point me in the right direction.
>
> Does anyone know of or have code to perform
> multi-dimensional FFT analysis on time series data? In my
> case, I would like to do a space-time analysis of upper
> tropospheric winds to determine the distribution of variance
> for both eastward and westward propagating waves.
>
> Thanks for any suggestions and/or pointers.
I have recently written some stuff to do this. See:
http://www.nbs.ac.uk/public/icd/wmc/idl/
(this wasn't the answer published earlier!)
My stuff is was written with time-longitude in mind so might prove useful.
It isn't difficult - fft does it all for you - but figuring out which
bits of the output mean what needs some wrapping up, which is what my pro's do.
Possibly even correctly...
- William
---
William M Connolley | wmc@bas.ac.uk | http://www.nbs.ac.uk/public/icd/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself
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