You would have been helped by looking in the FAQ: please do so now. Also, ?factor tells you not to use as.numeric.
On Thu, 31 Jul 2003, Tord Snall wrote: > Dear all, > > I have divided two vectors: > > Np.occup97.98<- as.data.frame(cbind(site = levels(sums$site), > Np.occup97.98 = sums$Ant.Nptrad97.98/Ant.trad$Ant.trad97.98)) > > > Np.occup97.98 > site Np.occup97.98 > 1 erken97 0.342592592592593 > 2 erken98 0.333333333333333 > 3 rormyran 0.48471615720524 > 4 valkror 0.286026200873362 > > However, at a later stage of the analysis I want > > round(Np.occup97.98[,2], 2) > Error in Math.factor(x, digits) : "round" not meaningful for factors > > neither did this work: > > > round(Np.occup97.98[,2], 2) > Error in Math.factor(x, digits) : "round" not meaningful for factors > > or this: > > > round(as.numeric(Np.occup97.98[,2]), 2) > [1] 3 2 4 1 > > > > because, as clearly written in the help file: > "as.numeric for factors yields the codes underlying the factor levels, not > the numeric representation of the labels." > > I've discovered this solution: > > > Np.occup97.98<- as.data.frame(cbind(site = levels(sums$site), > + Np.occup97.98 = > round(sums$Ant.Nptrad97.98/Ant.trad$Ant.trad97.98,2))) > > > > Np.occup97.98 > site Np.occup97.98 > 1 erken97 0.34 > 2 erken98 0.33 > 3 rormyran 0.48 > 4 valkror 0.29 > > > However, I would like to do this rounding later. > > Could someone give a tip. I think that I would have been helped by a > sentence in help(as.numeric). > > > Thanks in advance. > > > Sincerely, > Tord > > > > > ----------------------------------------------------------------------- > Tord Sn�ll > Avd. f v�xtekologi, Evolutionsbiologiskt centrum, Uppsala universitet > Dept. of Plant Ecology, Evolutionary Biology Centre, Uppsala University > Villav�gen 14 > SE-752 36 Uppsala, Sweden > Tel: 018-471 28 82 (int +46 18 471 28 82) (work) > Tel: 018-25 71 33 (int +46 18 25 71 33) (home) > Fax: 018-55 34 19 (int +46 18 55 34 19) (work) > E-mail: [EMAIL PROTECTED] > Check this: http://www.vaxtbio.uu.se/resfold/snall.htm! > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > -- 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://www.stat.math.ethz.ch/mailman/listinfo/r-help
