如何在 R 中复制向量以创建矩阵?
r programmingserver side programmingprogramming更新于 2025/6/25 11:22:17
矩阵可以通过 R 中的 matrix 函数创建，如果我们想通过复制向量来创建矩阵，那么我们只需关注复制操作即可。例如，如果我们有一个向量 V，并且想通过复制 V 两次来创建矩阵，那么可以使用 matrix(replicate(2,V),nrow=2) 来创建矩阵。
示例1
V1<-1:5 matrix(replicate(2,V1),nrow=5)
输出
[,1] [,2] [1,] 1 1 [2,] 2 2 [3,] 3 3 [4,] 4 4 [5,] 5 5
示例
matrix(replicate(5,V1),nrow=5)
输出
[,1] [,2] [,3] [,4] [,5] [1,] 1 1 1 1 1 [2,] 2 2 2 2 2 [3,] 3 3 3 3 3 [4,] 4 4 4 4 4 [5,] 5 5 5 5 5
示例
matrix(replicate(10,V1),nrow=5)
输出
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 1 1 1 1 1 1 1 1 1 1 [2,] 2 2 2 2 2 2 2 2 2 2 [3,] 3 3 3 3 3 3 3 3 3 3 [4,] 4 4 4 4 4 4 4 4 4 4 [5,] 5 5 5 5 5 5 5 5 5 5
示例
matrix(replicate(9,V1),nrow=5)
输出
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [1,] 1 1 1 1 1 1 1 1 1 [2,] 2 2 2 2 2 2 2 2 2 [3,] 3 3 3 3 3 3 3 3 3 [4,] 4 4 4 4 4 4 4 4 4 [5,] 5 5 5 5 5 5 5 5 5
示例2
V2<-rpois(10,5) V2
输出
[1] 1 4 2 6 7 2 4 4 2 8
示例
matrix(replicate(2,V2),nrow=10)
输出
[,1] [,2] [1,] 1 1 [2,] 4 4 [3,] 2 2 [4,] 6 6 [5,] 7 7 [6,] 2 2 [7,] 4 4 [8,] 4 4 [9,] 2 2 [10,] 8 8
示例
matrix(replicate(5,V2),nrow=10)
输出
[,1] [,2] [,3] [,4] [,5] [1,] 1 1 1 1 1 [2,] 4 4 4 4 4 [3,] 2 2 2 2 2 [4,] 6 6 6 6 6 [5,] 7 7 7 7 7 [6,] 2 2 2 2 2 [7,] 4 4 4 4 4 [8,] 4 4 4 4 4 [9,] 2 2 2 2 2 [10,] 8 8 8 8 8
示例
matrix(replicate(10,V2),nrow=10)
输出
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 1 1 1 1 1 1 1 1 1 1 [2,] 4 4 4 4 4 4 4 4 4 4 [3,] 2 2 2 2 2 2 2 2 2 2 [4,] 6 6 6 6 6 6 6 6 6 6 [5,] 7 7 7 7 7 7 7 7 7 7 [6,] 2 2 2 2 2 2 2 2 2 2 [7,] 4 4 4 4 4 4 4 4 4 4 [8,] 4 4 4 4 4 4 4 4 4 4 [9,] 2 2 2 2 2 2 2 2 2 2 [10,] 8 8 8 8 8 8 8 8 8 8
示例3
V3<-sample(0:9,10,replace=TRUE) V3
输出
[1] 1 8 8 5 9 7 0 7 1 8 matrix(replicate(5,V3),nrow=10)
输出
[,1] [,2] [,3] [,4] [,5] [1,] 1 1 1 1 1 [2,] 8 8 8 8 8 [3,] 8 8 8 8 8 [4,] 5 5 5 5 5 [5,] 9 9 9 9 9 [6,] 7 7 7 7 7 [7,] 0 0 0 0 0 [8,] 7 7 7 7 7 [9,] 1 1 1 1 1 [10,] 8 8 8 8 8
示例
matrix(replicate(3,V3),nrow=10)
输出
[,1] [,2] [,3] [1,] 1 1 1 [2,] 8 8 8 [3,] 8 8 8 [4,] 5 5 5 [5,] 9 9 9 [6,] 7 7 7 [7,] 0 0 0 [8,] 7 7 7 [9,] 1 1 1 [10,] 8 8 8
示例
matrix(replicate(12,V3),nrow=10)
输出
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,] 1 1 1 1 1 1 1 1 1 1 1 1 [2,] 8 8 8 8 8 8 8 8 8 8 8 8 [3,] 8 8 8 8 8 8 8 8 8 8 8 8 [4,] 5 5 5 5 5 5 5 5 5 5 5 5 [5,] 9 9 9 9 9 9 9 9 9 9 9 9 [6,] 7 7 7 7 7 7 7 7 7 7 7 7 [7,] 0 0 0 0 0 0 0 0 0 0 0 0 [8,] 7 7 7 7 7 7 7 7 7 7 7 7 [9,] 1 1 1 1 1 1 1 1 1 1 1 1 [10,] 8 8 8 8 8 8 8 8 8 8 8 8
