Thanks, that's very helpful! Also, many thanks to Dimitris Rizopoulos and Robin Williams who both came up with good solutions to my problem. Pall
-----Original Message----- From: Henrique Dallazuanna [mailto:[EMAIL PROTECTED] Sent: 12 September 2008 12:26 To: Jonsson, Pall Cc: r-help@r-project.org Subject: Re: [R] Finding a vector position using names rather than values Try this: order(row_median)[names(row_median) == "R3"] On Fri, Sep 12, 2008 at 5:22 AM, Jonsson, Pall < [EMAIL PROTECTED]> wrote: Dear R gurus, I have been struggling with this for a while and thought you might be able to give me some guidance. I have a data frame, on which I apply a row function. The result looks to me like a vector that retains the old row names. I then sort the vector and subsequently need to be able to identify the rank of certain values by searching for their row names. See this mock example: > dframe <- data.frame("Col1"=c(10,20,30), "Col2"=c(2,4,6), "Col3"=c(5,10,7), > row.names=c("R1","R2","R3")) > row_median<-apply(dframe,1,median) > row_median.sorted <- sort(row_median, decreasing=TRUE) > row_median.sorted R2 R3 R1 10 7 5 I now want to know the rank of, say R3 in this vector. I know I can use match() to find this using the vector values, however I need to use the header names (eg. "R3") rather than the value (7). Many thanks for your help, Pall ______________________________________________ R-help@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 [[alternative HTML version deleted]]
______________________________________________ R-help@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.
