[R] Applying 'cbind/rbind' among different list object

[Phil Spector]

Another possibility is

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

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at 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
> <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]]
>>
>> ______________________________________________
>> R-help at 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.
>>
>
>
>
> -- 
> Jim Holtman
> Data Munger Guru
>
> What is the problem that you are trying to solve?
>
> ______________________________________________
> R-help at 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.
>