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

[Gabor Grothendieck]

This suggests that one nice to have item would be to support
arr.ind= on which.min and which.max

On Wed, Jun 11, 2008 at 7:57 AM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
> 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 at 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
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> 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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>
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>
>