Another options is: head(lapply(a, tail, 2), 2)
On Wed, Jun 24, 2009 at 8:42 PM, Ivo Shterev <idc...@yahoo.com> wrote: > > Hello, > > I have a question about list indexing. Lets say we have a list of 3 lists, > each containing 3 different type elements: > > > a=replicate(3, list(list(c(1,1,1), diag(3), c(2,2,2)))) > > a > [[1]] > [[1]][[1]] > [1] 1 1 1 > > [[1]][[2]] > [,1] [,2] [,3] > [1,] 1 0 0 > [2,] 0 1 0 > [3,] 0 0 1 > > [[1]][[3]] > [1] 2 2 2 > > > [[2]] > [[2]][[1]] > [1] 1 1 1 > > [[2]][[2]] > [,1] [,2] [,3] > [1,] 1 0 0 > [2,] 0 1 0 > [3,] 0 0 1 > > [[2]][[3]] > [1] 2 2 2 > > > [[3]] > [[3]][[1]] > [1] 1 1 1 > > [[3]][[2]] > [,1] [,2] [,3] > [1,] 1 0 0 > [2,] 0 1 0 > [3,] 0 0 1 > > [[3]][[3]] > [1] 2 2 2 > > > If anyone can point a direction as to how to obtain (subset) the following > list from list a: > > b > [[1]] > [[1]][[1]] > [,1] [,2] [,3] > [1,] 1 0 0 > [2,] 0 1 0 > [3,] 0 0 1 > > [[1]][[2]] > [1] 2 2 2 > > > [[2]] > [[2]][[1]] > [,1] [,2] [,3] > [1,] 1 0 0 > [2,] 0 1 0 > [3,] 0 0 1 > > [[2]][[2]] > [1] 2 2 2 > > Also, suppose that one wishes to assign the list "b" to the corresponding > subset of list "a". Is there a way of doing so? > > Thanks for the help. > Ivo > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ 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.
