[英]How to find unique couples of numbers in a vector in R?
让我们假设有C<-c(1,2,3,4,5)我想找到可以从这个向量中提取的所有唯一的数字对，例如，12,13 23 等等。我该怎么做它？
使用RcppAlgos包。
## Combinations
unlist(RcppAlgos::comboGeneral(x, 2, FUN=function(x) Reduce(paste0, x)))
# [1] "12" "13" "14" "15" "23" "24" "25" "34" "35" "45"
## Permutations
unlist(RcppAlgos::permuteGeneral(x, 2, FUN=function(x) Reduce(paste0, x)))
# [1] "12" "13" "14" "15" "21" "23" "24" "25" "31" "32" "34" "35" "41" "42" "43"
# [16] "45" "51" "52" "53" "54"
一种选择可能是：
na.omit(c(`diag<-`(sapply(x, paste0, x), NA)))
[1] "12" "13" "14" "15" "21" "23" "24" "25" "31" "32" "34" "35" "41" "42" "43" "45"
[17] "51" "52" "53" "54"
找到常见和唯一的数字并将它们放入 R 中的新整数向量中
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[英]How can I find and replace a specific sequence of numbers in a vector in R?
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[英]How to run a loop in R to find a unique combination of numbers within a range of 7?
R：如何在不使用循环的情况下按唯一向量查找所有重复向量值顺序的索引？
[英]R: how to find index of all repetition vector values order by unique vector without using loop?
在R中，当有三列时，如何在行中找到唯一的数字对？
[英]In R, how can I find unique pairs of numbers across rows when there are three columns?
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