comp.lang.idl-pvwave archive: archive » Empirical Orthogonal Function analysis in IDL

Home » Public Forums » archive » Empirical Orthogonal Function analysis in IDL

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Empirical Orthogonal Function Analysis in IDL [message #60115 is a reply to message #1913]

Wed, 30 April 2008 08:50

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"David Fanning" <news@dfanning.com> wrote in message
news:MPG.22823fea344684119896f4@news.frii.com...
> d.poreh@gmail.com writes:
>
>> You mean something like averaging dumps the data? It is strange!!!
>
> Yeah, it's a mathematical thing. :-(

Can be thought of as applying a boxcar filter in time domain
(hence multiplying the spectrum with a sinc function) then performing
a downsampling operation in the time domain (i.e. truncating the spectrum).

Can introduce aliasing (a lil bit).

definitely places a null at certain frequencies, and passes (albeit
attenuatedly) some higher frequencies.

Cheers,
bob

PS Personally, I would never mean data together - i'd apply a better filter
than ye ole boxcar.

Report message to a moderator

[Message index]

		Empirical Orthogonal Function analysis in IDL By: dean on Thu, 07 April 1994 22:20
		Re: Empirical Orthogonal Function Analysis in IDL By: R.G. Stockwell on Wed, 30 April 2008 08:50
		Re: Empirical Orthogonal Function Analysis in IDL By: David Fanning on Wed, 30 April 2008 08:36
		Re: Empirical Orthogonal Function Analysis in IDL By: d.poreh on Wed, 30 April 2008 07:15
		Re: Empirical Orthogonal Function Analysis in IDL By: David Fanning on Wed, 30 April 2008 05:53
		Re: Empirical Orthogonal Function Analysis in IDL By: d.poreh on Wed, 30 April 2008 04:38
		Re: Empirical Orthogonal Function Analysis in IDL By: David Fanning on Mon, 28 April 2008 05:37
		Re: Empirical Orthogonal Function Analysis in IDL By: Gaurav on Mon, 28 April 2008 00:37
		Re: Empirical Orthogonal Function Analysis in IDL By: David Fanning on Sun, 27 April 2008 10:30

Previous Topic:	Some AVI bother...
Next Topic:	IDL Workbench Ignoring Breakpoints

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 10:31:36 PDT 2025

Total time taken to generate the page: 0.39963 seconds