建立R中的向量列表

Question

I want to define a list of vectors. The vector length is 4 and the length of list is N.

I am trying

list A=as.list(rep(c("","","",""),length=N)

but I am getting output

[[1]]
[1] ""

[[2]]
[1] ""

[[3]]
[1] ""

But I need the output as

[[1]]
[1] "" "" "" ""

[[2]]
[1] "" "" "" ""

[[3]]
[1] "" "" "" ""

How could this be done?

Thanks

Answer 1

N<-10
lapply(1:N,function(x)rep(c("","","",""),N))

actually if you're not repeating N times (ie all items the same), you probably need:

lapply(1:N,function(x)c("","","",""))

Answer 2

This is similar to Troy's, but different enough that I think it's worth posting:

 replicate(N, character(4), s=F)

With N==3 :

[[1]]
[1] "" "" "" ""

[[2]]
[1] "" "" "" ""

[[3]]
[1] "" "" "" ""