Today, I was looking for an elegant (and efficient) way to get a named (atomic) vector by selecting one column of a data frame. Of course, the vector names must be the rownames of the data frame.
Ok, here is the quiz, I know one quite "cute"/"slick" answer, but was wondering if there are obvious better ones, and also if this should not become more idiomatic (hence "R-devel"): Consider this toy example, where the dataframe already has only one column : > nv <- c(a=1, d=17, e=101); nv a d e 1 17 101 > df <- as.data.frame(cbind(VAR = nv)); df VAR a 1 d 17 e 101 Now how, can I get 'nv' back from 'df' ? I.e., how to get > identical(nv, .......) [1] TRUE where ...... only uses 'df' (and no non-standard R packages)? As said, I know a simple solution (*), but I'm sure it is not obvious to most R users and probably not even to the majority of R-devel readers... OTOH, people like Bill Dunlap will not take long to provide it or a better one. (*) In my solution, the above '.......' consists of 17 letters. I'll post it later today (CEST time) ... or confirm that someone else has done so. Martin ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
