comp.lang.idl-pvwave archive: archive » Re: find a plane in a 3D plot

Home » Public Forums » archive » Re: find a plane in a 3D plot

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

Re: find a plane in a 3D plot [message #62497 is a reply to message #62496]

Fri, 12 September 2008 06:59

Brian Larsen
Messages: 270
Registered: June 2006

Senior Member

Nicola,

One way this is done (maybe the way) is to do an eigenvector
decomposition of the data. One answer you get from this analysis is
the maximum, minimum, and intermediate variance directions. For your
data the maximum should be along the long axis of the ellipse,
intermediate along the short axis, and minimum should be the third
direction assuming things are really moving in a plane (or close to
it).

The particulars of how to actually do this depend on the data, format,
and all that jazz but its not generally too hard. Have a look on
wikipedia for eigenvectors and maybe even principal component analysis
(this is useful but not always comprehensible, at least for me).

Cheers,

Brian

------------------------------------------------------------ --------------
Brian Larsen
Boston University
Center for Space Physics
http://people.bu.edu/balarsen/Home/IDL

Report message to a moderator

[Message index]

		Re: find a plane in a 3D plot By: Nicola on Fri, 12 September 2008 09:20
		Re: find a plane in a 3D plot By: Wox on Fri, 12 September 2008 07:47
		Re: find a plane in a 3D plot By: David Fanning on Fri, 12 September 2008 07:29
		Re: find a plane in a 3D plot By: Brian Larsen on Fri, 12 September 2008 06:59
		Re: find a plane in a 3D plot By: pgrigis on Fri, 12 September 2008 06:45
		Re: find a plane in a 3D plot By: Wox on Mon, 22 September 2008 02:15

Previous Topic:	map_set problem
Next Topic:	find a plane in a 3D plot

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 17:25:06 PDT 2025

Total time taken to generate the page: 0.00401 seconds