comp.lang.idl-pvwave archive
Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
Home » Public Forums » archive » Re: Principal component analysis
Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend  		Return to the default flat view Create a new topic Submit Reply
Re: Principal component analysis [message #57145 is a reply to message #57144] Wed, 05 December 2007 06:57 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
David Fanning writes:

> Don't know. You will have to ask someone whose last math
> class wasn't over 30 years ago. :-)

I will say, though, that when I was looking into this
I noticed that what you pass in really doesn't matter
as long as you preserve the "vector" nature of the data.
That is to say, the absolute magnitude of the vectors
that comes out is irrelevant. The *relative* magnitudes
of the orthogonal vectors "explains" the data. So I would
say the various ways you can manipulate the data prior to
sending it to analysis are "scaling" functions that don't
fundamentally change the nature of the result.

At least that is my hand-waving explanation. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: Pointers problem - Unable to dereference NULL pointer
Next Topic: IDL7 Paths, again

-=] Back to Top [=-
[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Fri Oct 10 12:27:16 PDT 2025

Total time taken to generate the page: 1.03713 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.0.7.
Copyright ©2001-2013 FUDforum Bulletin Board Software