R help - Feb 2011 - Applying 'cbind/rbind' among different list object

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

	[[alternative HTML version deleted]]

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
<bkheijonathan at 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
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?