I may not understand, but if you are looking for a way to extract the second item from each list element, you will need to use lapply():
a <- list(LETTERS[1:3], 10:12, LETTERS[26:24], 15:13) b <- list(LETTERS[4:6], 15:17, LETTERS[23:21], 10:8) c <- list(LETTERS[7:9], 20:22, LETTERS[20:18], 5:3) abc <- list(a=a, b=b, c=c) abc # . . . Output deleted abc[[1]][[2]] # [1] 10 11 12 abc[["a"]][[2]] # [1] 10 11 12 abc[[1:3]][[2]] # Does not work # Error in abc[[1:3]][[2]] : subscript out of bounds lapply(abc, "[[", 2) # $a # [1] 10 11 12 # # $b # [1] 15 16 17 # # $c # [1] 20 21 22 # or less cryptically lapply(abc, function(x) x[[2]]) ------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of MacQueen, Don Sent: Wednesday, July 24, 2013 2:26 PM To: Eric TRAVAGLINI; r-help@r-project.org Subject: Re: [R] List Structure and Acces to data What you are doing looks like it is probably more complicated than necessary, but since I have no idea what structure you intend to create, it is hard to say. Here is a suggestion: try this: str(my_echant_hist) It will give you a summary of the structure of that object, which should help you understand how to access its elements. The expression my_echant_hist[[1]][[2]] makes sense if my_enchant_hist is a list, and if its first element is also a list. Then you're asking for the second element within the first element. There is nothing in R syntax that I know of that gives meaning to any of these my_echant_hist[[]] my_echant_hist[[:]] my_echant_hist[[;]] so I don't know what you were trying to get. I do suggest studying documentation for syntax related to using '['. Type ?'[' or help('[') -Don -- Don MacQueen Lawrence Livermore National Laboratory 7000 East Ave., L-627 Livermore, CA 94550 925-423-1062 On 7/23/13 4:22 AM, "Eric TRAVAGLINI" <eric.travagl...@crealp.vs.ch> wrote: >Hello, > >I used some other langages as Matlab and i just began with R, and i need >help with data structure. > >Here is my code > >" >fct_echant_hist <- function ( my_echant, my_vitesse, my_hist, my_summary) >{ > list (my_echant = my_echant, > my_vitesse = my_vitesse, > my_hist = my_hist, > my_summary = my_summary)} > > >my_echant_hist <- replicate(dim(pas)[1], fct_echant_hist(0L, > 0L, > matrix(nrow=length(my_breaks),ncol=1), > matrix(nrow=6,ncol=1)), > simplify=FALSE) >" >Is it possible to acces to all data of my_vitesse ? > > >to acces to the my_vitesse of the first record i write >my_echant_hist[[1]][[2]] > >I try something like that without succes : >my_echant_hist[[]][[2]] or >my_echant_hist[[:]][[2]] or >my_echant_hist[[;]][[2]] > > >Thanks a lot > >Eric ./. > >P:S Sorry for my English ______________________________________________ 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. ______________________________________________ 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.
