Hello,
Try the following.
fun <- function(x){
n.diff <- cumsum(diff(c(x[1], x)) <= 0)
split(x, n.diff)
}
numbers <- c(1,2,1,2,3,4,5)
fun(numbers)
fun( c(1,1,2,3,4,5,1,2,3,2,3,4,5,6,4,5) )
Hope this helps,
Rui Barradas
Em 01-08-2012 14:29, capy_bara escreveu:
Hello,
I have a vector with positive integer numbers, e.g.
numbers <- c(1,2,1,2,3,4,5)
and want to split the vector whenever an element in the vector is smaller or
equal to its predecessor.
Hence I want to obtain two vectors: c(1,2) and c(1,2,3,4,5).
I tried with which(), but it is not so elegant:
numbers[1:(which(numbers<=numbers[1])[2]-1)]
numbers[which(numbers<=numbers[1])[2]:length(numbers)]
Sure I can do it with a for-loop, but that seems a bit tedious for that
small problem.
Does maybe anyone know a simple and elegant solution for this? I'm searching
for a general solution, since
my vector may change and maybe be split into more than two vectors, e.g.
give five vectors for c(1,1,2,3,4,5,1,2,3,2,3,4,5,6,4,5).
Many thanks in advance,
Hannes
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