Re: [R] transforming factor back to numbers
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$year so that I have again >> the numerical values for year? >> >> Thanks >> >> Rainer >> >> -- >> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation >> Biology (UCT) >> >> Department of Conservation Ecology and Entomology >> University of Stellenbosch >> Matieland 7602 >> South Africa >> >> Tel:+27 - (0)72 808 2975 (w) >> Fax:+27 - (0)21 808 3304 >> Cell: +27 - (0)83 9479 042 >> >> email: [EMAIL PROTECTED] >> [EMAIL PROTECTED] >> >> __ >> R-help@stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > -- Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT) Department of Conservation Ecology and Entomology University of Stellenbosch Matieland 7602 South Africa Tel:+27 - (0)72 808 2975 (w) Fax:+27 - (0)21 808 3304 Cell: +27 - (0)83 9479 042 email: [EMAIL PROTECTED] [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] transforming factor back to numbers
That's an FAQ: 7.10 How do I convert factors to numeric? It may happen that when reading numeric data into R (usually, when reading in a file), they come in as factors. If f is such a factor object, you can use as.numeric(as.character(f)) to get the numbers back. More efficient, but harder to remember, is as.numeric(levels(f))[as.integer(f)] In any case, do not call as.numeric() or their likes directly for the task at hand (as as.numeric() or unclass() give the internal codes). On 21/09/06, Rainer M Krug <[EMAIL PROTECTED]> wrote: > Hi > > I generate a new dataframe by doing: > > npl.agg <- aggregate(npl$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] > > __ > 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. > -- = David Barron Said Business School University of Oxford Park End Street Oxford OX1 1HP __ 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.
[R] transforming factor back to numbers
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] __ 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.
