| PCA with Varimax Rotation [message #3546] |
Wed, 01 February 1995 05:11  |
mal3p
Messages: 13
Registered: June 1994
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Junior Member |
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I am looking for a PCA routine that implements the Varimax rotation.
The idlastro directory includes a PCA routine, but it does not seem to
support any rotation of the data- Does anyone have one out there? Does
the current version of idl or pvwave supprt such a function?
---------------+--------------------------------+----------- -----------------
Michael A. Lefsky | Dept. Environmental Sciences | mal3p@virginia.EDU
(804) 924-0532 | Clark Hall, Univ. of Virginia | mal3p@virginia.BITNET
(804) 982-2137(fax) | Charlottesville, VA 22903 |
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Michael A. Lefsky | Dept. Environmental Sciences | mal3p@virginia.EDU
(804) 924-0532 | Clark Hall, Univ. of Virginia | mal3p@virginia.BITNET
(804) 982-2137(fax) | Charlottesville, VA 22903 |
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| Re: PCA [message #4027 is a reply to message #3546] |
Wed, 19 April 1995 00:00  |
afl
Messages: 51
Registered: December 1994
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Member |
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In article <3n22hm$2ap5@yuma.ACNS.ColoState.EDU>, dean@phobos.cira.colostate.edu
writes:
|>
|> Has anyone done any Princple Component Analysis (PCA) techniques within
|> IDL? Or does IDL already provide this, but under another name? I have been
|> working with IMAGINE which has this feature. I would like to try PCA on
|> GOES-8 data within IDL. Before I go and code it up, I was wondering if
|> anyone has done this already.
|>
|> Kelly
Kelly,
The newest version of IDL (version 4.0, due out soon) has functions
for computing eigenvalues and eigenvectors. Would this help you?
"NO" is the expected response since you don't have a copy of version 4.0,
but if you did, are these the kind of functions you need?
Do you have any good PCA references that you could pass along, I am
always interested in obtaining better references on this subject.
Andy
--
Andrew F. Loughe email: afl@cdc.noaa.gov
University of Colorado, CIRES voice: (303) 492-0707
Campus Box 449 fax: (303) 497-7013
Boulder, CO 80309-0449 USA
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