Thanks John! Deepayan Sarkar also suggested this. I don't really expect to see any better solution. Murray
John Fox wrote: > Dear Murray, > > How about as.numeric(factor(y)) ? > > I hope this helps, > John > > -------------------------------- > John Fox > Department of Sociology > McMaster University > Hamilton, Ontario > Canada L8S 4M4 > 905-525-9140x23604 > http://socserv.mcmaster.ca/jfox > -------------------------------- > >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Murray >> Jorgensen >> Sent: Wednesday, October 25, 2006 7:13 PM >> To: r-help@stat.math.ethz.ch >> Subject: [R] Recoding categorical variables >> >> I want to recode an integer-valued variable y so that its >> values become 1:length(y). I can do this using a loop but >> maybe someone can suggest code without a loop. My code is this: >> >> y <- round(20*runif(25)) >> table(y) >> suy <- sort(unique(y)) >> m <- length(suy) >> z <- y + max(suy) >> for(i in 1:m) z[y==suy[i]] <- i >> rbind(y,z) >> >> (the recoded y is stored in z) >> >> Murray Jorgensen >> -- >> Dr Murray Jorgensen http://www.stats.waikato.ac.nz/Staff/maj.html >> Department of Statistics, University of Waikato, Hamilton, New Zealand >> Email: [EMAIL PROTECTED] Fax 7 838 4155 >> Phone +64 7 838 4773 wk Home +64 7 825 0441 Mobile 021 1395 862 >> >> ______________________________________________ >> 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. > -- Dr Murray Jorgensen http://www.stats.waikato.ac.nz/Staff/maj.html Department of Statistics, University of Waikato, Hamilton, New Zealand Email: [EMAIL PROTECTED] Fax 7 838 4155 Phone +64 7 838 4773 wk Home +64 7 825 0441 Mobile 021 1395 862 ______________________________________________ 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.