building list of vectors in R

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

Troy · Accepted Answer · 2014-02-21 13:23:54Z

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

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

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

BrodieG · Accepted Answer · 2014-02-21 13:40:09Z

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] "" "" "" ""

2 Answers 2