Hi everybody, my goal is to display symbols on the x-axis of a barplot. I read some mathematics strings in a file and convert them to an expression as follows:
tt<- scan(file = fstr ,'what' ='character', sep = ""); for (iaa in 1:length(tt)) { tt[iaa]<-do.call(expression, lapply(tt[iaa], as.name)); } I obtained the following result: tt = expression(`alpha[tr]`, beta, widthD, `S[ts]^-5("[165,275]Hz")`, `S[ts]^2("[165,275]Hz")`, `S[ts]^-5("[275,460]Hz")`, `S[r]^2("[165,275]Hz")`, `S[r]^-5("[275,460]Hz")`, `S[r]^3("[100,165]Hz")`, `T[ts]^4("[165,275]Hz")`, `T[ts]^7("[21,30]Hz")`, `T[ts]^8("[13,21]Hz")`, `T[r]^7("[21,30]Hz")`, `T[r]^8("[13,21]Hz")`, `T[r]^9("[8,13]Hz")`, `E("[100,165]Hz")`, `E("[165,275]Hz")`, `E("[60,100]Hz")`, `E("[8,13]Hz")`, `E("[30,60]Hz")`, `E("[21,30]Hz")`) only the strings without "`" are interpreted properly when I put the property names.arg =tt in barplot (ex:beta displays the greek letter, whereas `alpha[tr]` displays alpha[tr]), could you explain me why these symbol "`" intervenes when I convert the strings to an expression and/or how can I have the symbols associated with the strings displayed properly? Thanks you very much. -- View this message in context: http://www.nabble.com/variable-of-mathematics-string-not-interpreted-tp17138472p17138472.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.