[Putting back onto r-help] You could try sapply() and lapply().
> e <- sapply( 1:length(u), function(i) u[[i]][1] ) > e # [1] "1" "a" (note that the integer 1 became a character string "1") > f <- lapply( 1:length(u), function(i) u[[i]][1] ) > f [[1]] [1] 1 [[2]] [1] "a" In this case sapply will try to create a vector, and all its elements will need to be of the same type, so you end up with a character vector. The second method returns a list, which may or may not be of use to you, but each element of the list retains its type. ---------- Forwarded message --------- From: Faheem Jan <faheemja...@yahoo.com> Date: Thu, Jan 16, 2020 at 1:31 PM Subject: Re: [R] Extracting a particular column from list To: ericjber...@gmail.com <ericjber...@gmail.com> In my problem i want to extract the first value of a and b and so on... So using such data for further analysis Sent from Yahoo Mail on Android <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> On Thu, 16 Jan 2020 at 4:24 PM, Eric Berger <ericjber...@gmail.com> wrote: > u <- list(a=1:5, b=letters[1:3]) > u # $a # [1] 1 2 3 4 5 # # $b # [1] "a" "b" "c" > u[["a"]] [1] 1 2 3 4 5 On Thu, Jan 16, 2020 at 1:04 PM Faheem Jan via R-help <r-help@r-project.org> wrote: Hi. How to extract a column from the list.. I will be thanks full.. Sent from Yahoo Mail on Android [[alternative HTML version deleted]] ______________________________________________ R-help@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. [[alternative HTML version deleted]] ______________________________________________ R-help@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.