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varimax rotation

I'm using IDL 5.2 and the PCOMP function which principal component
analysis. Does anyone know where I can find an IDL-callable library that
would contain a routine to perform a "varimax" (i.e. a maximum variance)
rotation of the principal component vectors returned by PCOMP? Thanks in

Terence (Terry) Haran       National Snow & Ice Data Center
tharan@kryos.colorado.edu   University of Colorado
voice: 303-492-1847         Campus Box 449
fax:   303-492-2468         Boulder, CO 80309-0449