On Wed, 1 Sep 2004, michael watson (IAH-C) wrote: > I have a list. Two of the elements of this list are "Name" and > "Address", both of which are character vectors. Name and Address are > linked, so that the same "Name" always associates with the same > "Address". > > What I want to do is pull out the unique values, as a new list of the > same format (ie two elements of character vectors). Now I've worked out > that unique(list$Name) will give me a list of the unique names, but how > do I then go and link those to the correct (unique) addresses so I end > up with a new list which is the same format as the rest, but now unique?
match, as in match(unique(list$Name), list$name), OR indexing as in Address <- list$Address names(Address) <- list$Name Name <- unique(list$Name) list(Name, as.vector(Address[Name]) OR choose a better data structure as in unique(as.data.frame(list)) -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
