Try this:

which(pca == min(pca), arr.ind = TRUE)
which(pca == max(pca), arr.ind = TRUE)

On Wed, Jun 11, 2008 at 7:34 AM, Gundala Viswanath <gundalav@gmail.com>
wrote:

> Hi,
>
> Suppose I have the following data frame.
>
> __BEGIN__
>
> > library(MASS)
> > data(crabs)
> > crab.pca <- prcomp(crabs[,4:8],retx=TRUE)
> > crab.pca$rotation
>         PC1        PC2        PC3        PC4        PC5
> FL 0.2889810  0.3232500 -0.5071698  0.7342907  0.1248816
> RW 0.1972824  0.8647159  0.4141356 -0.1483092 -0.1408623
> CL 0.5993986 -0.1982263 -0.1753299 -0.1435941 -0.7416656
> CW 0.6616550 -0.2879790  0.4913755  0.1256282  0.4712202
> BD 0.2837317  0.1598447 -0.5468821 -0.6343657  0.4386868
>
> __END__
>
> Is there a way to identify the "coordinate" of a max/min value of all the
> points above.
>
> For example the coord of maximum value is (RW,PC2) = 0.865,
> and coord of min value is (CW,PC2) = - 0.288.
>
> --
> Gundala Viswanath
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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