comp.lang.idl-pvwave archive: archive » Re: Does IDL have a EOF(empirical orthogonal function)?

Home » Public Forums » archive » Re: Does IDL have a EOF(empirical orthogonal function)?

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

Re: Does IDL have a EOF(empirical orthogonal function)? [message #53310]

Wed, 04 April 2007 09:17

Kenneth Bowman
Messages: 86
Registered: November 2006

Member

In article <1175689745.510120.220440@y66g2000hsf.googlegroups.com>,
"uniqueman" <zhuangbao@gmail.com> wrote:

> I will use it to analyze my lightning data, who can I tell me how to
> implement it by IDL?

EOF's are the eigenfunctions of a covariance matrix, so you can
compute the covariance matrix and then use LA_EIGENQL
to find the desired eigenvectors and eigenvalues.

There are also LA_EIGENPROBLEM and LA_EIGENVEC functions with different
options.

I like LA_EIGENQL because it allows me to get only the first few
eigenvalues and eigenvectors of a large array quickly.

Ken Bowman

Report message to a moderator

Re: Does IDL have a EOF(empirical orthogonal function)? [message #53311 is a reply to message #53310]

Wed, 04 April 2007 08:14

Vince Hradil
Messages: 574
Registered: December 1999

Senior Member

On Apr 4, 7:29 am, "uniqueman" <zhuang...@gmail.com> wrote:
> I will use it to analyze my lightning data, who can I tell me how to
> implement it by IDL?
> Thanks !

IDL has PCA and SVD - can you use these?

Report message to a moderator

Previous Topic:	Does IDL have a EOF(empirical orthogonal function)?
Next Topic:	Re: Calculating Sat. water vapor pressure from air temperature: What is wrong?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:36:00 PDT 2025

Total time taken to generate the page: 0.00532 seconds