如何按R中的行复制矩阵？
逐行复制矩阵意味着一次或多次但逐行重复矩阵。例如，如果我们有一个只包含一行和三列的矩阵，那么该矩阵的复制将被重复三遍，重复三遍。可以通过使用rep函数和矩阵函数来完成此操作，如下例所示。
示例
M<-matrix(1:25,ncol=5) M
输出结果
[,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
复制矩阵M两次-
示例
matrix(rep(t(M),2),ncol=ncol(M),byrow=TRUE)
输出结果
[,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
复制矩阵M三次-
示例
matrix(rep(t(M),3),ncol=ncol(M),byrow=TRUE)
输出结果
[,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
五次复制矩阵M-
示例
matrix(rep(t(M),5),ncol=ncol(M),byrow=TRUE)
输出结果
[,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
五次复制矩阵M-
示例
matrix(rep(t(M),6),ncol=ncol(M),byrow=TRUE)
输出结果
[,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