Hi? friends - I'm in problems finding out how to unquote - I have a
series of vectors named adds1....adds11 and need to e.g. find the sum of
each of them
So I try
SS <- c()
for (i in 1:11) {
e <- paste("adds",i,sep="")
SS[i]? <- sum(xx(e)) }
Now e looks right - but I have been unable to find out how to get the
string e converted to the proper argument for sum()? - i.e. what? is
function xx?
All best wishes
Troels Ring, Aalborg, Denmark
?s 09:13 de 03/07/2024, Troels Ring escreveu:> Hi? friends - I'm in problems finding out how to unquote - I have a > series of vectors named adds1....adds11 and need to e.g. find the sum of > each of them > > So I try > > SS <- c() > > for (i in 1:11) { > > e <- paste("adds",i,sep="") > > SS[i]? <- sum(xx(e)) } > > Now e looks right - but I have been unable to find out how to get the > string e converted to the proper argument for sum()? - i.e. what? is > function xx? > > All best wishes > Troels Ring, Aalborg, Denmark > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.Hello, Function xx is ?get or mget (same help page). You can get the vectors adds all in one instruction with mget or one at a time with get. adds1 <- 1:10 adds2 <- 2:10 adds3 <- 3:10 adds4 <- 4:10 adds5 <- 5:10 # create SS with the required length beforehand SS <- numeric(5L) for (i in 1:5) { e <- paste("adds",i,sep="") SS[i] <- sum(get(e)) } SS #> [1] 55 54 52 49 45 Or all in one instruction with the assistance of ?ls. # ls(pattern = "^adds") |> mget() |> lapply(sum) ls(pattern = "^adds") |> mget() |> sapply(sum) #> adds1 adds2 adds3 adds4 adds5 #> 55 54 52 49 45 Hope this helps, Rui Barradas -- Este e-mail foi analisado pelo software antiv?rus AVG para verificar a presen?a de v?rus. www.avg.com
? Wed, 3 Jul 2024 10:13:59 +0200 Troels Ring <tring at gvdnet.dk> ?????:> Now e looks right - but I have been unable to find out how to get the > string e converted to the proper argument for sum()? - i.e. what? is > function xx?get(e) will return the value of the variable with the name stored in the variable e. A more idiomatic variant will require more changes: 1. Create the "adds" variable as a list, so that it could contain other arbitrary R values: adds <- list() 2. Instead of assigning adds1 <- something(), adds2 <- something_else(), ..., assign to the elements of the list: adds[[1]] <- something() adds[[2]] <- something_else() ... 3. Now you can use the same syntax to access the elements of the list: SS[i] <- sum(adds[[i]]) As a bonus, you can use the "apply" family of R functions that will perform the loop for you: instead of SS <- c(); for (i in 1:11) SS[i] <- sum(adds[[i]]) you can write SS <- vapply(adds, sum, numeric(1)) ...and it will perform the same loop inside it, verifying each time that sum(adds[[i]]) returns a single number. -- Best regards, Ivan P.S. I'm sorry for letting our project lapse.