[R] strings concatenation and organization (fast)

[Rui Barradas]

Hello,

Try


vec = c("1","2","3","-","-","-","4","5","6","1","2","3","-","-","-")
nms = c("A","B","C","D")
rep_vec <- rep(sapply(split(vec, cumsum(rep(c(1, 0, 0), 5))), paste, 
collapse=""), 4)
mat <- matrix(rep_vec, nrow=5, byrow=TRUE, dimnames=list(NULL,nms))
mat


Hope this helps,

Rui Barradas

Em 15-06-2012 21:11, Ben quant escreveu:
> Hello,
>
> What is the fastest way to do this? I has to be done quite a few times.
> Basically I have sets of 3 numbers (as characters) and sets of 3 dashes and
> I have to store them in named columns. The order of the sets and the column
> name they fall under is important. The actual numbers and the pattern/order
> of the sets should be considered random/unpredictable.
>
> Sample data:
> vec = c("1","2","3","-","-","-","4","5","6","1","2","3","-","-","-")
> rep_vec = rep(vec,times=20)
> nms = c("A","B","C","D")
>
> I need to get this:
>    A     B     C     D
> "123" "---" "456" "123"
> "---" "123" "---" "456"
> "123" "---" "123" "---"
> "456" "123" "---" "123"
> "---" "456" "123" "---"
>
> Note: a matrix of 4 columns and 5 rows of concatenated string sets.
>
> Thanks!!
>
> Ben
>
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