在 r 中将向量分割成块

Question

I have to split a vector into n chunks of equal size in R. I couldn't find any base function to do that. Also Google didn't get me anywhere. So here is what I came up with, hopefully it helps someone some where.

x <- 1:10
n <- 3
chunk <- function(x,n) split(x, factor(sort(rank(x)%%n)))
chunk(x,n)
$`0`
[1] 1 2 3

$`1`
[1] 4 5 6 7

$`2`
[1]  8  9 10

Any comments, suggestions or improvements are really welcome and appreciated.

Cheers, Sebastian

转载于:https://stackoverflow.com/questions/3318333/split-a-vector-into-chunks-in-r

Answer 1

You could combine the split/cut, as suggested by mdsummer, with quantile to create even groups:

split(x,cut(x,quantile(x,(0:n)/n), include.lowest=TRUE, labels=FALSE))

This gives the same result for your example, but not for skewed variables.