[R] Principle component analysis function

[phthao05]

Dear All,
In a package, I want to use PCA function. The structure I used follow this
page: http://www.statmethods.net/advstats/factor.html.
       fit<-principle(mydata, nfactors=9, rotation=TRUE)
   or:
       result<-PCA(mydata)
    
But I don't known why R language in my computer noticed: "not found
principle", "not found PCA".
I download and installed R-2.6.2-win32.exe.
Thanks alot for answering me.
Hue University, VietNam.
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