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问题描述
我正在尝试在R中编写一个函数,给定一个向量和最大大小n,它将返回该向量中所有元素的组合,直到大小n。
I'm trying to write a function in R that, given a vector and a maximum size n, will return all the combinations of elements from that vector, up to size n.
例如:
multi_combn(LETTERS[1:3], 2)会产生的收益:
[[1]] [1] "A" [[2]] [1] "B" [[3]] [1] "C" [[4]] [1] "A" "B" [[5]] [1] "A" "C" [[6]] [1] "B" "C"我想出了一种巧妙的方法来运行 combn ,每个大小最多为n,但是我可以似乎没有将结果合并到一个列表中。有建议吗?
I've figured out an inelegant way to run combn for each size up to n, but I can't seem to combine the results into a single list. Any suggestions?
推荐答案尝试一下:
multi_combn <- function(dat, n) { unlist(lapply(1:n, function(x) combn(dat, x, simplify=F)), recursive=F) }返回
> multi_combn(LETTERS[1:3], 2) [[1]] [1] "A" [[2]] [1] "B" [[3]] [1] "C" [[4]] [1] "A" "B" [[5]] [1] "A" "C" [[6]] [1] "B" "C"更多推荐
给定一个向量,返回最大为n的所有组合的列表
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