None of this would work if the list is long. Isn't this an obvious
task for a loop, explicit or implicit?
e.g.
for(i in 1:100)assign(paste("vec",i,sep=""), vector("integer",5))
or probably better because it creates a list structure:
## warning, untested. You may have to fool with the syntax a bit:
listofempties <- lapply(1:100, vector,mode="integer",length=5)
## you can name the components with names(listofempties) <-
paste("vec",1:100,sep="")
HOWEVER, I rather doubt that any of this is necessary: that is, it is
rarely necessary or wise in R to first create empty objects and then
populate them. Using lists and list operations usually allows both to
be done more efficiently and conveniently in one step.
--
Bert Gunter
Genentech Nonclinical Statistics
On Tue, Aug 24, 2010 at 8:19 AM, r.ookie <r.oo...@live.com> wrote:
> Do you mean something like this?
>
>>
> n <- 5
>
>>
> (vec1 <- matrix(rep(1, n)))
> [,1]
> [1,] 1
> [2,] 1
> [3,] 1
> [4,] 1
> [5,] 1
>
>>
> (vec2 <- matrix(rep(2, n)))
> [,1]
> [1,] 2
> [2,] 2
> [3,] 2
> [4,] 2
> [5,] 2
>
>>
> (vec3 <- matrix(rep(3, n)))
> [,1]
> [1,] 3
> [2,] 3
> [3,] 3
> [4,] 3
> [5,] 3
>
>>
>
>
>>
> (vec <- matrix(c(vec1, vec2, vec3)))
> [,1]
> [1,] 1
> [2,] 1
> [3,] 1
> [4,] 1
> [5,] 1
> [6,] 2
> [7,] 2
> [8,] 2
> [9,] 2
> [10,] 2
> [11,] 3
> [12,] 3
> [13,] 3
> [14,] 3
> [15,] 3
>
>>
>
> On Aug 24, 2010, at 4:58 AM, Maas James Dr (MED) wrote:
>
> Simple one, have read and googled, still no luck!
>
> I want to create several empty vectors all of the same length.
>
> I would like multiple empty vectors (vec1, vec2, vec3) and want to create
> them all in one line.
>
> I've tried
>
> vec1,vec2,vec3 <- vector(length=5)
> and
> c(vec1,vec2,vec3) <- vector(length=5)
>
> and several other attempts but nothing seems to work ... suggestions?
>
> Thanks
>
> Jim
>
> ===============================
> Dr. Jim Maas
> University of East Anglia
>
>
> [[alternative HTML version deleted]]
>
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>
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