Yup, I want these as labels on plots, but I need it as: D (mg kg^-1) rather than "D (mg kg)^-1".
Sorry for not being more clear and thanks for your help. Cheers On Wed, Apr 3, 2013 at 6:44 PM, David Winsemius <dwinsem...@comcast.net>wrote: > > On Apr 3, 2013, at 9:06 AM, Shane Carey wrote: > > > Hi, > > > > If I have data as follows: > > DATA_names<-c( > > "A mg kg" > > "B mg kg" > > "C mg kg" > > "D mg kg" > > "E mg kg" > > "F mg kg" > > "G mg kg" > > "H mg kg" > > > > How do I convert to: > > -1 > > A (mg kg ) > > -1 > > B (mg kg ) > > -1 > > C (mg kg ) > > -1 > > D (mg kg ) > > -1 > > E (mg kg ) > > -1 > > F (mg kg ) > > -1 > > G (mg kg ) > > -1 > > H (mg kg ) > > > > I have lots of elements and I need to do this automatically in a for loop > > or the like? > > You haven't described the task in very much detail, so Bill Dunlap's > language-oriented (more "expressive" as it were) solution my be what you > really need. Nonetheless, this answer stays on the character-plane of R's > conceptual levels: > > gsub("mg kg", "(mg kg)^-1", DATA_names) > [1] "A (mg kg)^-1" "B (mg kg)^-1" "C (mg kg)^-1" "D (mg kg)^-1" "E (mg > kg)^-1" "F (mg kg)^-1" > [7] "G (mg kg)^-1" "H (mg kg)^-1" > > If you wanted these in an expression vector suitable for labels on a > barplot or such: > > sapply(gsub("mg kg", "(mg kg)^-1", DATA_names), as.expression) > > expression(`A (mg kg)^-1` = "A (mg kg)^-1", `B (mg kg)^-1` = "B (mg > kg)^-1", > `C (mg kg)^-1` = "C (mg kg)^-1", `D (mg kg)^-1` = "D (mg kg)^-1", > `E (mg kg)^-1` = "E (mg kg)^-1", `F (mg kg)^-1` = "F (mg kg)^-1", > `G (mg kg)^-1` = "G (mg kg)^-1", `H (mg kg)^-1` = "H (mg kg)^-1") > > In practice: > > > pos <- barplot(1:length(DATA_names)) > > text(x=pos,y=-1, xpd=TRUE, srt=45, > labels= sapply( gsub("mg kg", "(mg kg)^-1", DATA_names), > as.expression)) > > > -- > David Winsemius > Alameda, CA, USA > > -- Shane [[alternative HTML version deleted]] ______________________________________________ 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.