Another possibility is

mapply(rbind,list1,list2,SIMPLIFY=FALSE)

                                        - Phil Spector
                                         Statistical Computing Facility
                                         Department of Statistics
                                         UC Berkeley
                                         spec...@stat.berkeley.edu


On Sun, 6 Feb 2011, jim holtman wrote:

will this do it for you:

lapply(seq(length(list1)), function(i)rbind(list1[[i]], list2[[i]]))
[[1]]
    [,1] [,2] [,3] [,4] [,5]
[1,]    1    6   11   16   21
[2,]    2    7   12   17   22
[3,]    3    8   13   18   23
[4,]    4    9   14   19   24
[5,]    5   10   15   20   25
[6,]   10   11   12   13   14

[[2]]
    [,1] [,2] [,3] [,4] [,5]
[1,]    2    7   12   17   22
[2,]    3    8   13   18   23
[3,]    4    9   14   19   24
[4,]    5   10   15   20   25
[5,]    6   11   16   21   26
[6,]   11   12   13   14   15


On Sun, Feb 6, 2011 at 1:32 PM, B. Jonathan B. Jonathan
<bkheijonat...@gmail.com> wrote:
Hi, I am wondering whether we can apply 'cbind/rbind' on many **equivalent**
list objects. For example please consider following:

list1 <- list2 <- vector("list", length=2); names(list1) <- names(list2)
<- c("a", "b")
list1[[1]] <- matrix(1:25, 5)
list1[[2]] <- matrix(2:26, 5)
list2[[1]] <- 10:14
list2[[2]] <- 11:15
list1
$a
    [,1] [,2] [,3] [,4] [,5]
[1,]    1    6   11   16   21
[2,]    2    7   12   17   22
[3,]    3    8   13   18   23
[4,]    4    9   14   19   24
[5,]    5   10   15   20   25
$b
    [,1] [,2] [,3] [,4] [,5]
[1,]    2    7   12   17   22
[2,]    3    8   13   18   23
[3,]    4    9   14   19   24
[4,]    5   10   15   20   25
[5,]    6   11   16   21   26
list2
$a
[1] 10 11 12 13 14
$b
[1] 11 12 13 14 15

Here I want to "rbind" these 2 list-s according to "a" and "b" i.e. I want
to get another list of length 2 where each element will be matrix with (6x5)
dimension. How can I do that?

Thanks for your time

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--
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?

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