one way is the following: assignation$value[match(x, assignation$class)]
I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "javier garcia-pintado" <[EMAIL PROTECTED]> To: <r-help@stat.math.ethz.ch> Sent: Thursday, February 01, 2007 12:05 PM Subject: [R] indexing > Hello, > In a nutshell, I've got a data.frame like this: > >> assignation <- >> data.frame(value=c(6.5,7.5,8.5,12.0),class=c(1,3,5,2)) >> assignation > value class > 1 6.5 1 > 2 7.5 3 > 3 8.5 5 > 4 12.0 2 >> > > and a long vector of classes like this: > >> x <- c(1,1,2,7,6,5,4,3,2,2,2...) > > And would like to obtain a vector of length = length(x), with the > corresponding values extracted from assignation table. Like this: >> x.value > [1] 6.5 6.5 12.0 NA NA 8.5 NA 7.5 12.0 12.0 12.0 > > Could you help me with an elegant way to do this ? > (I just can do it with looping for each class in the assignation > table, > what a think is not perfect in R's sense) > > Wishes, > Javier > -- > > Javier GarcĂa-Pintado > Institute of Earth Sciences Jaume Almera (CSIC) > Lluis Sole Sabaris s/n, 08028 Barcelona > Phone: +34 934095410 > Fax: +34 934110012 > e-mail:[EMAIL PROTECTED] > > -------------------------------------------------------------------------------- > ______________________________________________ > R-help@stat.math.ethz.ch 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. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ R-help@stat.math.ethz.ch 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.