如何在 R 中按行復制一個矩陣?
按行復制矩陣表示按順序重複一個或多個矩陣,但以行方式。例如,如果我們有一個只包含一行和三列的矩陣,那麼該矩陣的複製三次將在其行中重複三次。這可以透過使用和矩陣函式的複製函式來完成,如下圖所示。
示例
M<-matrix(1:25,ncol=5) M
輸出
[,1] [,2] [,3] [,4] [,5] [1,] 1 6 11 16 21 [2,] 2 7 12 17 22 [3,] 3 8 13 18 23 [4,] 4 9 14 19 24 [5,] 5 10 15 20 25
將矩陣 M 複製兩次 −
示例
matrix(rep(t(M),2),ncol=ncol(M),byrow=TRUE)
輸出
[,1] [,2] [,3] [,4] [,5] [1,] 1 6 11 16 21 [2,] 2 7 12 17 22 [3,] 3 8 13 18 23 [4,] 4 9 14 19 24 [5,] 5 10 15 20 25 [6,] 1 6 11 16 21 [7,] 2 7 12 17 22 [8,] 3 8 13 18 23 [9,] 4 9 14 19 24 [10,] 5 10 15 20 25
將矩陣 M 複製三次 −
示例
matrix(rep(t(M),3),ncol=ncol(M),byrow=TRUE)
輸出
[,1] [,2] [,3] [,4] [,5] [1,] 1 6 11 16 21 [2,] 2 7 12 17 22 [3,] 3 8 13 18 23 [4,] 4 9 14 19 24 [5,] 5 10 15 20 25 [6,] 1 6 11 16 21 [7,] 2 7 12 17 22 [8,] 3 8 13 18 23 [9,] 4 9 14 19 24 [10,] 5 10 15 20 25 [11,] 1 6 11 16 21 [12,] 2 7 12 17 22 [13,] 3 8 13 18 23 [14,] 4 9 14 19 24 [15,] 5 10 15 20 25
將矩陣 M 複製五次 −
示例
matrix(rep(t(M),5),ncol=ncol(M),byrow=TRUE)
輸出
[,1] [,2] [,3] [,4] [,5] [1,] 1 6 11 16 21 [2,] 2 7 12 17 22 [3,] 3 8 13 18 23 [4,] 4 9 14 19 24 [5,] 5 10 15 20 25 [6,] 1 6 11 16 21 [7,] 2 7 12 17 22 [8,] 3 8 13 18 23 [9,] 4 9 14 19 24 [10,] 5 10 15 20 25 [11,] 1 6 11 16 21 [12,] 2 7 12 17 22 [13,] 3 8 13 18 23 [14,] 4 9 14 19 24 [15,] 5 10 15 20 25 [16,] 1 6 11 16 21 [17,] 2 7 12 17 22 [18,] 3 8 13 18 23 [19,] 4 9 14 19 24 [20,] 5 10 15 20 25 [21,] 1 6 11 16 21 [22,] 2 7 12 17 22 [23,] 3 8 13 18 23 [24,] 4 9 14 19 24 [25,] 5 10 15 20 25
將矩陣 M 複製五次 −
示例
matrix(rep(t(M),6),ncol=ncol(M),byrow=TRUE)
輸出
[,1] [,2] [,3] [,4] [,5] [1,] 1 6 11 16 21 [2,] 2 7 12 17 22 [3,] 3 8 13 18 23 [4,] 4 9 14 19 24 [5,] 5 10 15 20 25 [6,] 1 6 11 16 21 [7,] 2 7 12 17 22 [8,] 3 8 13 18 23 [9,] 4 9 14 19 24 [10,] 5 10 15 20 25 [11,] 1 6 11 16 21 [12,] 2 7 12 17 22 [13,] 3 8 13 18 23 [14,] 4 9 14 19 24 [15,] 5 10 15 20 25 [16,] 1 6 11 16 21 [17,] 2 7 12 17 22 [18,] 3 8 13 18 23 [19,] 4 9 14 19 24 [20,] 5 10 15 20 25 [21,] 1 6 11 16 21 [22,] 2 7 12 17 22 [23,] 3 8 13 18 23 [24,] 4 9 14 19 24 [25,] 5 10 15 20 25 [26,] 1 6 11 16 21 [27,] 2 7 12 17 22 [28,] 3 8 13 18 23 [29,] 4 9 14 19 24 [30,] 5 10 15 20 25
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