Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
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 | ---------------+--------------------------------+----------- ----------------- -- ---------------+--------------------------------+----------- ----------------- 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 |
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