On Wed, 5 Nov 2003, Pascal A. Niklaus wrote: > Hi all, > > I repeatedly encounter the following problem: After importing a data set > into a data frame, I wish to set a column with numeric values to be a > factor, but can't figure out how to do this. Also, I do not wish to > write as.factor(x) all the time. I can create a new vector with x <- > factor(x), but the new vector resides outside the attached data frame. > > Pascal > > > attach(ngrad) > > is.factor(STNW) > [1] FALSE > > > ngrad$STNW<-factor(STNW) ## doesn't work > > is.factor(STNW) > [1] FALSE
It does work. It changes ngrad, and not the copy you attached. ngrad$STNW<-factor(ngrad$STNW) attach(ngrad) is the correct sequence. -- 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
