按百分位数分割向量 [英] split a vector by percentile
问题描述
我需要将 R 中已排序的未知长度向量拆分为前 10%,...,后 10%"因此,例如,如果我有 vector <- order(c(1:98928))
,我想将其拆分为 10 个不同的向量,每个向量大约占总长度的 10%.
I need to split a sorted unknown length vector in R into "top 10%,..., bottom 10%"
So, for example if I have vector <- order(c(1:98928))
, I want to split it into 10 different vectors, each one representing approximately 10% of the total length.
我试过使用 split <- split(vector, 1:10)
但由于我不知道向量的长度,如果不是多个,我会得到这个错误
Ive tried using split <- split(vector, 1:10)
but as I dont know the length of the vector, I get this error if its not multiple
数据长度不是拆分变量的倍数
data length is not a multiple of split variable
即使它的倍数和函数有效,split()
也不会保持我原始向量的顺序.这就是 split 给出的结果:
And even if its multiple and the function works, split()
does not keep the order of my original vector. This is what split gives:
split(c(1:10) , 1:2)
$`1`
[1] 1 3 5 7 9
$`2`
[1] 2 4 6 8 10
这就是我想要的:
$`1`
[1] 1 2 3 4 5
$`2`
[1] 6 7 8 9 10
我是 R 的新手,我尝试了很多东西都没有成功,有人知道怎么做吗?
Im newbie in R and Ive been trying lots of things without success, does anyone knows how to do this?
推荐答案
问题说明
将一个已排序的向量 x
每 10% 分成 10 个块.
Problem statement
Break a sorted vector x
every 10% into 10 chunks.
请注意,对此有两种解释:
Note there are two interpretation for this:
按矢量索引切割:
split(x, floor(10 * seq.int(0, length(x) - 1) / length(x)))
按向量值(例如分位数)切割:
split(x, cut(x, quantile(x, prob = 0:10 / 10, names = FALSE), include = TRUE))
下面我会用数据做示范:
In the following, I will make demonstration using data:
set.seed(0); x <- sort(round(rnorm(23),1))
特别是,我们的示例数据是正态分布而不是均匀分布,因此按索引切割和按值切割有很大不同.
Particularly, our example data are Normally distributed rather than uniformly distributed, so cutting by index and cutting by value are substantially different.
按索引切割
#$`0`
#[1] -1.5 -1.2 -1.1
#
#$`1`
#[1] -0.9 -0.9
#
#$`2`
#[1] -0.8 -0.4
#
#$`3`
#[1] -0.3 -0.3 -0.3
#
#$`4`
#[1] -0.3 -0.2
#
#$`5`
#[1] 0.0 0.1
#
#$`6`
#[1] 0.3 0.4 0.4
#
#$`7`
#[1] 0.4 0.8
#
#$`8`
#[1] 1.3 1.3
#
#$`9`
#[1] 1.3 2.4
按分位数切割
#$`[-1.5,-1.06]`
#[1] -1.5 -1.2 -1.1
#
#$`(-1.06,-0.86]`
#[1] -0.9 -0.9
#
#$`(-0.86,-0.34]`
#[1] -0.8 -0.4
#
#$`(-0.34,-0.3]`
#[1] -0.3 -0.3 -0.3 -0.3
#
#$`(-0.3,-0.2]`
#[1] -0.2
#
#$`(-0.2,0.14]`
#[1] 0.0 0.1
#
#$`(0.14,0.4]`
#[1] 0.3 0.4 0.4 0.4
#
#$`(0.4,0.64]`
#numeric(0)
#
#$`(0.64,1.3]`
#[1] 0.8 1.3 1.3 1.3
#
#$`(1.3,2.4]`
#[1] 2.4
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