如何在R中创建矢量元素的无序三元组？
要创建矢量元素的三元组，可以使用combn函数。例如，如果我们有一个向量x包含值1，2，3，4，5，则可以使用combn(x,3)创建x的无序三元组。这将创建一个矩阵，其中向量x的元素将不按特定顺序排列。
示例
x1<-1:5combn(x1,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10][1,] 1 1 1 1 1 1 2 2 2 3
[2,] 2 2 2 3 3 4 3 3 4 4
[3,] 3 4 5 4 5 5 4 5 5 5
示例
x2<-1:8combn(x2,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14][1,] 1 1 1 1 1 1 1 1 1 1 1 1 1 1
[2,] 2 2 2 2 2 2 3 3 3 3 3 4 4 4
[3,] 3 4 5 6 7 8 4 5 6 7 8 5 6 7
[,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [,24] [,25] [,26]
[1,] 1 1 1 1 1 1 1 2 2 2 2 2
[2,] 4 5 5 5 6 6 7 3 3 3 3 3
[3,] 8 6 7 8 7 8 8 4 5 6 7 8
[,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34] [,35] [,36] [,37] [,38]
[1,] 2 2 2 2 2 2 2 2 2 2 3 3
[2,] 4 4 4 4 5 5 5 6 6 7 4 4
[3,] 5 6 7 8 6 7 8 7 8 8 5 6
[,39] [,40] [,41] [,42] [,43] [,44] [,45] [,46] [,47] [,48] [,49] [,50]
[1,] 3 3 3 3 3 3 3 3 4 4 4 4
[2,] 4 4 5 5 5 6 6 7 5 5 5 6
[3,] 7 8 6 7 8 7 8 8 6 7 8 7
[,51] [,52] [,53] [,54] [,55] [,56]
[1,] 4 4 5 5 5 6
[2,] 6 7 6 6 7 7
[3,] 8 8 7 8 8 8
示例
x3<-0:5combn(x3,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14][1,] 0 0 0 0 0 0 0 0 0 0 1 1 1 1
[2,] 1 1 1 1 2 2 2 3 3 4 2 2 2 3
[3,] 2 3 4 5 3 4 5 4 5 5 3 4 5 4
[,15] [,16] [,17] [,18] [,19] [,20]
[1,] 1 1 2 2 2 3
[2,] 3 4 3 3 4 4
[3,] 5 5 4 5 5 5
示例
x4<-rpois(5,1)x4
输出结果
[1] 5 2 1 1 0
示例
combn(x4,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10][1,] 5 5 5 5 5 5 2 2 2 1
[2,] 2 2 2 1 1 1 1 1 1 1
[3,] 1 1 0 1 0 0 1 0 0 0
示例
combn(x5,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14][1,] 8 8 8 8 8 8 8 8 8 8 8 8 8 8
[2,] 0 0 0 0 0 0 7 7 7 7 7 5 5 5
[3,] 7 5 4 7 7 8 5 4 7 7 8 4 7 7
[,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [,24] [,25] [,26]
[1,] 8 8 8 8 8 8 8 0 0 0 0 0
[2,] 5 4 4 4 7 7 7 7 7 7 7 7
[3,] 8 7 7 8 7 8 8 5 4 7 7 8
[,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34] [,35] [,36] [,37] [,38]
[1,] 0 0 0 0 0 0 0 0 0 0 7 7
[2,] 5 5 5 5 4 4 4 7 7 7 5 5
[3,] 4 7 7 8 7 7 8 7 8 8 4 7
[,39] [,40] [,41] [,42] [,43] [,44] [,45] [,46] [,47] [,48] [,49] [,50]
[1,] 7 7 7 7 7 7 7 7 5 5 5 5
[2,] 5 5 4 4 4 7 7 7 4 4 4 7
[3,] 7 8 7 7 8 7 8 8 7 7 8 7
[,51] [,52] [,53] [,54] [,55] [,56]
[1,] 5 5 4 4 4 7
[2,] 7 7 7 7 7 7
[3,] 8 8 7 8 8 8
示例
x6<-sample(11:15,7,replace=TRUE)x6
输出结果
[1] 14 12 11 12 12 13 15
示例
combn(x6,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14][1,] 14 14 14 14 14 14 14 14 14 14 14 14 14 14
[2,] 12 12 12 12 12 11 11 11 11 12 12 12 12 12
[3,] 11 12 12 13 15 12 12 13 15 12 13 15 13 15
[,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [,24] [,25] [,26]
[1,] 14 12 12 12 12 12 12 12 12 12 12 11
[2,] 13 11 11 11 11 12 12 12 12 12 13 12
[3,] 15 12 12 13 15 12 13 15 13 15 15 12
[,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34] [,35]
[1,] 11 11 11 11 11 12 12 12 12
[2,] 12 12 12 12 13 12 12 13 13
[3,] 13 15 13 15 15 13 15 15 15
示例
x7<-rpois(8,20)x7
输出结果
[1] 9 18 29 27 15 21 21 17
示例
combn(x7,3)
输出结果
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14][1,] 9 9 9 9 9 9 9 9 9 9 9 9 9 9
[2,] 18 18 18 18 18 18 29 29 29 29 29 27 27 27
[3,] 29 27 15 21 21 17 27 15 21 21 17 15 21 21
[,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [,24] [,25] [,26]
[1,] 9 9 9 9 9 9 9 18 18 18 18 18
[2,] 27 15 15 15 21 21 21 29 29 29 29 29
[3,] 17 21 21 1 7 21 17 17 27 15 21 21 17
[,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34] [,35] [,36] [,37] [,38]
[1,] 18 18 18 18 18 18 18 18 18 18 29 29
[2,] 27 27 27 27 15 15 15 21 21 21 27 27
[3,] 15 21 21 17 21 21 17 21 17 17 15 21
[,39] [,40] [,41] [,42] [,43] [,44] [,45] [,46] [,47] [,48] [,49] [,50]
[1,] 29 29 29 29 29 29 29 29 27 27 27 27
[2,] 27 27 15 15 15 21 21 21 15 15 15 21
[3,] 21 17 21 2 1 17 21 17 17 21 21 17 21
[,51] [,52] [,53] [,54] [,55] [,56]
[1,] 27 27 15 15 15 21
[2,] 21 21 21 21 21 21
[3,] 17 17 21 17 17 17
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