Hi: Here's another approach:
library(reshape) l <- list(a1, a2, a3, a4) ll <- melt(l) ll[ll$value %in% i, 'L1'] # [1] 1 3 HTH, Dennis On Thu, Jun 17, 2010 at 4:40 PM, song song <rprojecth...@gmail.com> wrote: > for example, I have > > a1=c(1,3,5) > a2=c(2,4,6) > a3=c(7,8) > a4=c(9,10) > > now if I have i=5, so i in a1, then I get a feedback tag[5]=1 > i=8, so i in a3, then can get tag[8]=3 > > in there any function to do this to check the element belongs to which > group? > > thank you!!! > > [[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. > [[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.
