[R] access sublists by a variable
Dear list, I'd like to access the elements of a list within another list with the help of a variable. dict - list( 24 = c(1,2,3,6,12,24,48,72,96,120,144,168,720), 168 = c(1,12,24,48,72,96,120,144,168,336,504,672), 8760 = c(1,24,168,730,4380,8760) ) dict$24 works fine, but a - 24 dict$a returns NULL Unfortunately dict[a] does not work for me, because I see no possibility to access the inner elements of list 24 in that case i.e. dict[a][1] returns the whole list and not the first element. What is the correct syntax to access those elements with the help of a variable? Thanks in advance Antje __ 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.
Re: [R] access sublists by a variable
dict[[a]] ? `[[` Michael On Wed, Nov 16, 2011 at 10:16 AM, Antje Gruner n...@allesjetzt.net wrote: Dear list, I'd like to access the elements of a list within another list with the help of a variable. dict - list( 24 = c(1,2,3,6,12,24,48,72,96,120,144,168,720), 168 = c(1,12,24,48,72,96,120,144,168,336,504,672), 8760 = c(1,24,168,730,4380,8760) ) dict$24 works fine, but a - 24 dict$a returns NULL Unfortunately dict[a] does not work for me, because I see no possibility to access the inner elements of list 24 in that case i.e. dict[a][1] returns the whole list and not the first element. What is the correct syntax to access those elements with the help of a variable? Thanks in advance Antje __ 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.
Re: [R] access sublists by a variable
On Nov 16, 2011, at 10:16 AM, Antje Gruner wrote: Dear list, I'd like to access the elements of a list within another list with the help of a variable. dict - list( 24 = c(1,2,3,6,12,24,48,72,96,120,144,168,720), 168 = c(1,12,24,48,72,96,120,144,168,336,504,672), 8760 = c(1,24,168,730,4380,8760) ) dict$24 works fine, but a - 24 dict$a I can't remember if this is a FAQ but it is certainly discussed on the page you would ge with ?$ dict[[a]] returns NULL Unfortunately dict[a] does not work for me, because I see no possibility to access the inner elements of list 24 in that case i.e. dict[a][1] returns the whole list and not the first element. What is the correct syntax to access those elements with the help of a variable? Thanks in advance Antje __ 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. David Winsemius, MD West Hartford, CT __ 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.
Re: [R] access sublists by a variable
Hi: Try dict[[a]] rather than dict$a, and read the section on lists in the Introduction to R manual to learn how to properly index them. HTH, Dennis On Wed, Nov 16, 2011 at 7:16 AM, Antje Gruner n...@allesjetzt.net wrote: Dear list, I'd like to access the elements of a list within another list with the help of a variable. dict - list( 24 = c(1,2,3,6,12,24,48,72,96,120,144,168,720), 168 = c(1,12,24,48,72,96,120,144,168,336,504,672), 8760 = c(1,24,168,730,4380,8760) ) dict$24 works fine, but a - 24 dict$a returns NULL Unfortunately dict[a] does not work for me, because I see no possibility to access the inner elements of list 24 in that case i.e. dict[a][1] returns the whole list and not the first element. What is the correct syntax to access those elements with the help of a variable? Thanks in advance Antje __ 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.
