打印 R 中字符向量的所有排列

Question

For starters, forgive my math terminology ignorance (I'll edit this question, once errors in my vocabulary are pointed out).

How can I print a complete set of 3 element permutation of a 10 element vector in R?

Let's assume a vector consists of 10 unique letters A to J

x<- LETTERS[seq( from = 1, to = 10 )]

I'd like to list (print) all possible 3 unique element permutations, for example:

ABC, ACB, ABD, ADB ... etc

Thank you for any hints

Answer 1

This can be easily done using the gtools package.

prm <- gtools::permutations(n=10, r=3, v=LETTERS[1:10])

Then you can apply paste0 across the rows to get a vector.

apply(prm, 1, function(x)paste0(x, collapse=''))

Answer 2

类似于collin使用新管道，您可以写为：

LETTERS[1:10] |> permutations(n=10,r=3) |> apply(1,paste, collapse = '')