Thanks a lot David. Just a suggestion - it might help if this is added to the help of factor()
Rainer David Barron wrote: > That's an FAQ: > > 7.10 How do I convert factors to numeric? > > It may happen that when reading numeric data into R (usually, when > reading in a file), they come in as factors. If f is such a factor > object, you can use > > as.numeric(as.character(f)) > > to get the numbers back. More efficient, but harder to remember, is > > as.numeric(levels(f))[as.integer(f)] > > In any case, do not call as.numeric() or their likes directly for the > task at hand (as as.numeric() or unclass() give the internal codes). > > On 21/09/06, Rainer M Krug <[EMAIL PROTECTED]> wrote: >> Hi >> >> I generate a new dataframe by doing: >> >> npl.agg <- aggregate(npl$DensPlants, list(year=npl$year, sim=npl$sim), >> mean, na.rm=TRUE ) >> >> Now I want to plot it by using >> >> coplot(npl.agg$x ~ npl.agg$year | npl.agg$sim, type="l") >> >> but, as npl.agg$year is seen as a factor, the order of the points on the >> x-axis (time axis) does not follow the numerical sorting 1...100, but >> rather the text sorting of the factor npl.agg$year >> >> Is there any way that I can 'defactor' npl.agg$year so that I have again >> the numerical values for year? >> >> Thanks >> >> Rainer >> >> -- >> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation >> Biology (UCT) >> >> Department of Conservation Ecology and Entomology >> University of Stellenbosch >> Matieland 7602 >> South Africa >> >> Tel: +27 - (0)72 808 2975 (w) >> Fax: +27 - (0)21 808 3304 >> Cell: +27 - (0)83 9479 042 >> >> email: [EMAIL PROTECTED] >> [EMAIL PROTECTED] >> >> ______________________________________________ >> [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 >> and provide commented, minimal, self-contained, reproducible code. >> > > -- Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Department of Conservation Ecology and Entomology University of Stellenbosch Matieland 7602 South Africa Tel: +27 - (0)72 808 2975 (w) Fax: +27 - (0)21 808 3304 Cell: +27 - (0)83 9479 042 email: [EMAIL PROTECTED] [EMAIL PROTECTED] ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
