R:来自具有 2 个可能条件 (+/-) 的元素向量的所有可能组合 [英] R: all possible combinations from a vector of elements with 2 possible conditions (+/-)

问题描述

我有一个名为 markers 的元素向量，其形式为:

I have a vector of elements named markers of the form:

markers <- LETTERS[1:5]

markers 中的每个元素都是布尔类型，有两个可能的条件 + 和 -.我想要一种快速有效的方法来获得所有可能的组合，以便考虑这两个条件(即使条件不同，标记也不能与自身配对).

Each element in markers is of Boolean type with two possible conditions + and -. I would like a fast an efficient way to obtain all possible combinations, so that the two conditions are considered (a marker with cannot be paired with itself even if the condition is different).

理想情况下，结果只是一个字符向量或一个列表，其中的元素是由 / 分隔的标记组合.

The result would ideally be just a character vector or a list, where its elements are the marker combinations separated by /.

此示例中包含五个字母的元素应为:

The elements for this example with five letters should be:

A-/B-/C-/D-/E-
A-/B+/C-/D-/E-
A-/B-/C+/D-/E-
A-/B-/C-/D+/E-
A-/B-/C-/D-/E+
A-/B+/C+/D-/E-
A-/B+/C-/D+/E-
A-/B+/C-/D-/E+
A-/B+/C+/D+/E-
A-/B+/C+/D-/E+
A-/B+/C+/D+/E+
A+/B-/C-/D-/E-
A+/B+/C-/D-/E-
A+/B-/C+/D-/E-
A+/B-/C-/D+/E-
A+/B-/C-/D-/E+
A+/B+/C+/D-/E-
A+/B+/C-/D+/E-
A+/B+/C-/D-/E+
A+/B+/C+/D+/E-
A+/B+/C+/D-/E+
A+/B+/C+/D+/E+
...

不确定我是否遗漏了任何组合，但你明白了...我一直在尝试使用 expand.grid 和 combn 但我没有t 似乎做对了.任何帮助表示赞赏！

Not sure if I'm missing any combination, but you get the idea... I've been trying with expand.grid and combn but I don't seem to get it right. Any help appreciated!

谢谢！

推荐答案

markers <- LETTERS[1:5]

test <- expand.grid(lapply(seq(markers), function(x) c("+","-")),stringsAsFactors=FALSE)

> test
   Var1 Var2 Var3 Var4 Var5
1     +    +    +    +    +
2     -    +    +    +    +
3     +    -    +    +    +
4     -    -    +    +    +
 ....


apply(test,1,function(x){paste0(markers,x,collapse = "/")}) 


 [1] "A+/B+/C+/D+/E+" "A-/B+/C+/D+/E+" "A+/B-/C+/D+/E+" "A-/B-/C+/D+/E+" "A+/B+/C-/D+/E+" "A-/B+/C-/D+/E+" "A+/B-/C-/D+/E+"
 [8] "A-/B-/C-/D+/E+" "A+/B+/C+/D-/E+" "A-/B+/C+/D-/E+" "A+/B-/C+/D-/E+" "A-/B-/C+/D-/E+" "A+/B+/C-/D-/E+" "A-/B+/C-/D-/E+"
[15] "A+/B-/C-/D-/E+" "A-/B-/C-/D-/E+" "A+/B+/C+/D+/E-" "A-/B+/C+/D+/E-" "A+/B-/C+/D+/E-" "A-/B-/C+/D+/E-" "A+/B+/C-/D+/E-"
[22] "A-/B+/C-/D+/E-" "A+/B-/C-/D+/E-" "A-/B-/C-/D+/E-" "A+/B+/C+/D-/E-" "A-/B+/C+/D-/E-" "A+/B-/C+/D-/E-" "A-/B-/C+/D-/E-"
[29] "A+/B+/C-/D-/E-" "A-/B+/C-/D-/E-" "A+/B-/C-/D-/E-" "A-/B-/C-/D-/E-"

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