Hi Sven,
My suggestion would be that instead of cluttering your code with such "old fashion" assignments you would switch to dplyr mutate or data.table's inline :=. Both are the de-facto standards in the wild by now. Vitalie >> On Tue, Apr 30 2019 15:28, Alex Branham via ESS-help wrote: > On Tue 30 Apr 2019 at 13:25, Sven Hartenstein via ESS-help > <ess-help@r-project.org> wrote: >> Dear ESS users and developers, >> >> when writing R code to manipulate an object or data frame column, I >> often find myself retyping the expression on the left side of "<-" as >> some argument for a function call or assignment on the right side of >> "<-". >> >> Here are two examples. Imagine your point is at _POINT_ and you want to >> insert 'data[,"columnA"]' in the first example and in the second example >> 'data[ data[,"columnB"] < 123 ,"columnA"]' at point. >> >> data[,"columnA"] <- tolower(_POINT_) >> >> data[ data[,"columnB"] > 123 ,"columnA"] <- gsub("xxx", >> "yyy", >> _POINT_, >> fixed=TRUE) >> >> Wouldn't it be handy to have a lisp function which copies the expression >> on the left side of "<-" and inserts it at point? >> >> Or is something like this already available in ESS? > Not to my knowledge, no. >> What do you think? > I don't think it's a terrible idea; I've found myself wanting to do that > several times in the past (though less so now with magrittr pipes). > I guess implementation-wise the tricky bit would be figuring out what to > do in the case of 1) more than one assignment e.g. x <- y <- 2 and also > 2) how to find the start of the "left" side. It would be tricky to > differentiate between: > x[[ > 1]] <- 1 > and > x <- 1 > y <- 2 > since we can't reliably detect complete R, especially not backwards. I > guess one quick workaround would be to work with indentation --- just to > take all the lines starting with whitespace before the <- until we find > one all-whitespace line or the first line that doesn't start with > whitespace. > Thanks for the suggestion, > Alex > ______________________________________________ > ESS-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/ess-help ______________________________________________ ESS-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/ess-help