我想使用cut()中定义的中断来剪切数据：
x = c(-10:10)
cut(x, c(-2,4,6,7))
[1] <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> (-2,4] (-2,4] (-2,4] (-2,4] (-2,4] (-2,4] (4,6] (4,6] (6,7] <NA> <NA>
[21] <NA>
Levels: (-2,4] (4,6] (6,7]
但是，我还希望获得级别(minimum:-2]和(7:maximum]。在汽车包的函数recode()中，可以使用“lo：”。是否有类似的东西可用于切割？
答案 0 :(得分：8)
x <- -10:10
cut(x, c(-Inf, -2, 4, 6, 7, +Inf))
# Levels: (-Inf,-2] (-2,4] (4,6] (6,7] (7, Inf]
答案 1 :(得分：5)
您可以使用min()和max()评估区间范围（如Gavin所述）并设置include.lowest = TRUE以确保最小值（此处为-10）是间隔。
输入：
x = c(-10:10)
cut(x, c(min(x),-2,4,6,7,max(x)), include.lowest = TRUE)
输出：
[1] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] (-2,4]
[11] (-2,4] (-2,4] (-2,4] (-2,4] (-2,4] (4,6] (4,6] (6,7] (7,10] (7,10]
[21] (7,10]
Levels: [-10,-2] (-2,4] (4,6] (6,7] (7,10]
答案 2 :(得分：4)
findInterval就是答案。
i <- findInterval(x, c(-2,4,6,7))
cbind(x, i)
x i
[1,] -10 0
[2,] -9 0
[3,] -8 0
[4,] -7 0
[5,] -6 0
[6,] -5 0
[7,] -4 0
[8,] -3 0
[9,] -2 1
[10,] -1 1
[11,] 0 1
[12,] 1 1
[13,] 2 1
[14,] 3 1
[15,] 4 2
[16,] 5 2
[17,] 6 3
[18,] 7 4
[19,] 8 4
[20,] 9 4
[21,] 10 4
答案 3 :(得分：2)
我遇到了Inf＆amp; -Inf之前{虽然正是为什么在这个时刻逃脱了我）所以一个更安全的解决方案可能是填充适当延长的最小值和最大值：
x <- c(-10:10)
cut(x, c(min(x) -1 , -2, 4, 6, 7, max(x) + 1))
R> x <- c(-10:10)
R> cut(x, c(min(x) -1 , -2, 4, 6, 7, max(x) + 1))
[1] (-11,-2] (-11,-2] (-11,-2] (-11,-2] (-11,-2] (-11,-2] (-11,-2] (-11,-2]
[9] (-11,-2] (-2,4] (-2,4] (-2,4] (-2,4] (-2,4] (-2,4] (4,6]
[17] (4,6] (6,7] (7,11] (7,11] (7,11]
Levels: (-11,-2] (-2,4] (4,6] (6,7] (7,11]
在大多数情况下，Sven的答案/解决方案就足够了。
答案 4 :(得分：0)
我们还可以使用smart_cut软件包中的cutr：
# devtools::install_github("moodymudskipper/cutr")
library(cutr)
x <- -10:10
smart_cut(x, c(-2, 4, 6, 7), closed="right")
# [1] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] [-10,-2] (-2,4] (-2,4] (-2,4] (-2,4] (-2,4]
# [15] (-2,4] (4,6] (4,6] 7 (7,10] (7,10] (7,10]
# Levels: [-10,-2] < (-2,4] < (4,6] < 7 < (7,10]
它的expand参数默认情况下设置为TRUE，将其设置为FALSE使其像base::cut一样工作。
答案 5 :(得分：0)
(My) santoku 包在必要时自动延长休息时间：
library(santoku)
x <- c(-10:10)
chop(x, c(-2, 4, 6, 7))
## [1] [-10, -2) [-10, -2) [-10, -2) [-10, -2) [-10, -2) [-10, -2) [-10, -2) [-10, -2) [-2, 4)
## [10] [-2, 4) [-2, 4) [-2, 4) [-2, 4) [-2, 4) [4, 6) [4, 6) [6, 7) [7, 10]
## [19] [7, 10] [7, 10] [7, 10]
## Levels: [-10, -2) [-2, 4) [4, 6) [6, 7) [7, 10]
您可以使用 extend 的 chop() 参数控制此行为。