On Thu, 2 Jan 2003, Tord Snall wrote: > I have a tree data matrix.
Don't think so: you appear to have a data frame, which is not at all the same thing. > For some trees I lack info about tree species, > but I want to set them to be spruce. For some reason the tree species names > on the remaining (non-NA) rows are changed into numbers (that I do not > recognise). You should do so. They are the code of the factor in your data frame. > I guess that ifelse is not the correct function to use, but I have not > found any better one in my searches. Your two arguments to ifelse are a character vector and a factor. You will get coercion of the factor to an atomic type, and that's where the codes come from. test$tree.sp[is.na(test$tree.sp)] <- "spruce" is probably what you wanted. > > Thanks in advance! > > Sincerely, > Tord > > > > test > ObjektID tree.sp Diameter > 2030 S.2001.S5 <NA> 2 > 2034 S.2001.S5 <NA> 2 > 1 S.1 spruce 2 > 2 S.1 birch 12 > 3 S.1 spruce 7 > 4 S.1 spruce 5 > 5 S.1 birch 8 > > > test$tree.sp6<- ifelse(is.na(test$tree.sp) == T, "spruce", test$tree.sp) > > > test > ObjektID tree.sp Diameter tree.sp6 > 2030 S.2001.S5 <NA> 2 spruce > 2034 S.2001.S5 <NA> 2 spruce > 1 S.1 spruce 2 8 > 2 S.1 birch 12 3 > 3 S.1 spruce 7 8 > 4 S.1 spruce 5 8 > 5 S.1 birch 8 3 > > > ----------------------------------------------------------------------- > 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 > http://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 http://www.stat.math.ethz.ch/mailman/listinfo/r-help
