Hi, You can use these as well to access named members.
> a[1] [[1]] a b 2 3 >a[1][[1]][1] a 2 > a[[1,1]][1] a 2 >a[[1,1]][2] b 3 >identical(a[[1,1]]["a"],a[[1,1]][1],a[1][[1]][1]) [1] TRUE > a[[1,1]][["a"]] [1] 2 > a[[1,1]][["b"]] [1] 3 or, > a[[c(1,2)]] [1] 3 >a[[c(1,1)]] [1] 2 >a$ab<-a[[1]] > a$ab a b 2 3 >a$ab[1] a 2 >a$ab1<-a[[1]][1] >a$ab1 a 2 Hope this will be of some use for you A.K. ----- Original Message ----- From: mlell08 <mlel...@gmail.com> To: r-help@r-project.org Cc: Sent: Saturday, June 30, 2012 9:35 AM Subject: [R] Accessing named members of a list in an array Dear List, I've created a two-dimensional array which shall contain a value and its error, respectively. These two values are concatenated in al list and bear the names "sl" and "sl_err" But I can't adress them using the $-notation. a<- array(list(NULL),dim=c(2,2)) a[[1,1]]<- c(a=2,b=3) a[[1,1]]$a ## Fehler in a[[1, 1]]$a : $ operator is invalid for atomic vectors a[[1,1]]["a"] # This works however. ## a ## 2 I always thought these two methods of indexing are equal? Is there any way to use the $-Style indexing? Thank you, Moritz -- GnuPG Key: 0x7340821E ______________________________________________ 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.
