On 12/14/2007 7:39 AM, Peter Paul wrote: > > Hi, > > I think this is a pretty basic question. I still couldn#t find the answer to > it, though. > > I have some data loaded into R, which looks like this: > >> data() > ... > 38358 Advice Article > 38359 Advice Article > 38360 GeneralInfo List > 38361 GeneralInfo Article > 38362 Purchase Paragraphs > 38363 Purchase List > 38364 Purchase Paragraphs > ... > > > I now would like to edit the data in such a way that every "Advice" is > changed into "GeneralInfo". > Is there some easy way how I can do this?
This is a little tricky, because R has probably converted those columns into factors. Let's assume that column 2 is named Type and the dataset is named dat. Then you replace it as dat$Type[dat$Type == "Advice"] <- "GeneralInfo" You'd think the following would work: dat$Type <- ifelse(dat$Type == "Advice", "GeneralInfo", dat$Type) but it doesn't, because ifelse() loses the factor levels. Factors are one of the most error-prone features of the S language. Duncan Murdoch ______________________________________________ R-help@r-project.org 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.
