如何复制向量以在R中创建矩阵?
可以通过使用R中的矩阵函数来创建矩阵,如果我们想通过复制向量来创建矩阵,那么我们只需要关注复制。例如,如果我们有一个向量V,并且希望通过复制V两次来创建矩阵,则可以将矩阵创建为matrix(replicate(2,V),nrow = 2)。
例1
V1<-1:5matrix(replicate(2,V1),nrow=5)
输出结果
[,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)
输出结果
[,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)
输出结果
[,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)
输出结果
[,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
例2
V2<-rpois(10,5)V2
输出结果
[1] 1 4 2 6 7 2 4 4 2 8
示例
matrix(replicate(2,V2),nrow=10)
输出结果
[,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)
输出结果
[,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)
输出结果
[,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
范例3
V3<-sample(0:9,10,replace=TRUE)V3
输出结果
[1] 1 8 8 5 9 7 0 7 1 8matrix(replicate(5,V3),nrow=10)
输出结果
[,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)
输出结果
[,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)
输出结果
[,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
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