[R] How do I return to the row values of a matrix after computing distances

[David Winsemius]

On Nov 7, 2011, at 8:06 AM, qqh5011 wrote:

> ##    Package Needed
> library(fields)
>
> ## Assumptions
> set.seed(123)
> nsim<-5
> p<-2
>
> ##    Generate Random Matrix G
> G <- matrix(runif(p*nsim),nsim,p)
>
> ##    Set Empty Matraces dmax and dmin
> dmax<- matrix(data=NA,nrow=nsim,ncol=p)
> dmin<- matrix(data=NA,nrow=nsim,ncol=p)
>
> ## Loop to Fill dmax and dmin
> for(i in 1:nsim) {
>
> dmax[i]<- max(rdist(G[i,,drop=FALSE],G))
> dmin[i]<- min(rdist(G[i,,drop=FALSE],G[-i,])) }
>
> I filled the dmax and dmin with the distance values I calculated,  
> but what I really want to fill them with are the rows in G. What  
> should I do? I tried "which" function but it did not work. Thank you  
> in advance!!!!


Dear qq5011 ... AKA user1033763;

The practice of cross-posting questions to StackOverFlow and rhelp  
within hours of each other is deprecated, at least on on rhelp.

http://stackoverflow.com/questions/8036831/how-to-return-to-the-qualifying-rows-of-original-data

If you don't get an answer within some reasonable interval (measured  
in days, not hours) then feel free to post a follow-up ... with  
citation of the first posting.


> qqh5011
> 	[[alternative HTML version deleted]]

Posting in HTML is likewise deprecated. Please read the Posting Guide  
were both of these issues and many other sensible requests for  
professional behavior are detailed

> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html

> and provide commented, minimal, self-contained, reproducible code.

(You did do that, and please continue to do so.)
-- 

David Winsemius, MD
West Hartford, CT