Hi > Dear All, > I am quite a newbie to R. Trying to learn it these days. Sorry for asking > such a basic question, but could you kindly tell me how to map unique string > values to integers in a data frame? I have a graph which has, most of its, > vertices' attributes in a string format. I would like to replace them with > ascending integers. For example, first unique value in column 1 changes to > "0". I'd like to have it so that I could use my computer's resources > efficiently and also could easily perform statistical measures on it. I am > looking for a two way mapping, so that, after analysis, I could see > meaningful results in terms of the same but in reverse order mappings. Hope > I was clear in my question.
I doubt it. Maybe others can resolve your intention without any data or code. I can only guess that you have some character values in some king of object (data.frame?, vector?, matrix?....0 basically you can change it to factor and do as.numeric to this factor. Something like x<-sample(letters[1:5], 20, replace=TRUE) [1] 5 4 4 2 5 3 4 5 5 3 3 2 5 3 3 3 4 1 4 3 data.frame(x=x, x.n=as.numeric(factor(x))) x x.n 1 e 5 2 d 4 3 d 4 4 b 2 5 e 5 6 c 3 7 d 4 8 e 5 9 e 5 10 c 3 11 c 3 12 b 2 13 e 5 14 c 3 15 c 3 16 c 3 17 d 4 18 a 1 19 d 4 20 c 3 Regards Petr > > Thanks! > > Cheers, > Ali > > > -- > View this message in context: http://r.789695.n4.nabble.com/Mapping- > strings-to-integers-tp3762828p3762828.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.
