如何在R中的某些条件下建立置换 [英] How to build permutation with some conditions in R
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问题描述
我是R的新手,我有些困惑.假设我有一个向量c(1,2,3,4,5,6).我想生成包含四个元素的排列,每个排列都应包含1和5.谢谢.
I am new to R and I am a little confused. Suppose I have a vector of c(1,2,3,4,5,6). I would like to generate permutations with four elements and every permutation should involve 1 and 5. Thank you.
推荐答案
您可以使用gtools软件包中的="nofollow noreferrer"> permutations()
以获取置换,然后
You can use permutations()
from the gtools
package to get the permuations, and filter_all()
from dplyr
to get just the ones with 1 and 5:
library(gtools)
library(dplyr)
data <- c(1, 2, 3, 4, 5, 6)
permutations(n = 6, r = 4, v = data, repeats.allowed = FALSE) %>%
as_tibble() %>%
filter_all(any_vars(. == 5)) %>%
filter_all(any_vars(. == 1))
输出:
# A tibble: 144 x 4
V1 V2 V3 V4
<dbl> <dbl> <dbl> <dbl>
1 1 2 3 5
2 1 2 4 5
3 1 2 5 3
4 1 2 5 4
5 1 2 5 6
# ...
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