[R] Odp: Finding Coordinate of Max/Min Value in a Data Frame

From: Petr PIKAL <petr.pikal_at_precheza.cz>
Date: Wed, 11 Jun 2008 13:59:58 +0200

Hi

r-help-bounces_at_r-project.org napsal dne 11.06.2008 12:34:47:

> 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.
>

which(crab.pca$rotation==min(crab.pca$rotation), arr.ind=T) which(crab.pca$rotation==max(crab.pca$rotation), arr.ind=T)

Regards
Petr

> 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. Received on Wed 11 Jun 2008 - 13:04:51 GMT

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