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How to repeat a whole matrix in R?
To repeat a whole matrix in R, we can follow the below steps −
First of all, create a matrix.
Then, use rep function to repeat the matrix.
Example
Create the matrix
Let’s create a matrix as shown below −
M<-matrix(rpois(80,10),ncol=4) M
Output
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
[,1] [,2] [,3] [,4] [1,] 12 10 13 5 [2,] 15 10 9 9 [3,] 10 10 4 10 [4,] 8 10 6 10 [5,] 11 9 5 10 [6,] 9 6 10 9 [7,] 11 12 15 11 [8,] 13 6 9 15 [9,] 12 14 9 16 [10,] 10 10 18 10 [11,] 15 7 11 11 [12,] 8 14 6 14 [13,] 12 9 4 12 [14,] 13 4 9 17 [15,] 7 6 5 7 [16,] 11 7 9 12 [17,] 10 10 8 7 [18,] 12 10 5 8 [19,] 10 13 10 9 [20,] 8 10 6 10
Repeat the whole matrix
Using rep function to repeat the matrix M two times −
M<-matrix(rpois(80,10),ncol=4) M[rep(1:nrow(M),2),]
Output
[,1] [,2] [,3] [,4] [1,] 12 10 13 5 [2,] 15 10 9 9 [3,] 10 10 4 10 [4,] 8 10 6 10 [5,] 11 9 5 10 [6,] 9 6 10 9 [7,] 11 12 15 11 [8,] 13 6 9 15 [9,] 12 14 9 16 [10,] 10 10 18 10 [11,] 15 7 11 11 [12,] 8 14 6 14 [13,] 12 9 4 12 [14,] 13 4 9 17 [15,] 7 6 5 7 [16,] 11 7 9 12 [17,] 10 10 8 7 [18,] 12 10 5 8 [19,] 10 13 10 9 [20,] 8 10 6 10 [21,] 12 10 13 5 [22,] 15 10 9 9 [23,] 10 10 4 10 [24,] 8 10 6 10 [25,] 11 9 5 10 [26,] 9 6 10 9 [27,] 11 12 15 11 [28,] 13 6 9 15 [29,] 12 14 9 16 [30,] 10 10 18 10 [31,] 15 7 11 11 [32,] 8 14 6 14 [33,] 12 9 4 12 [34,] 13 4 9 17 [35,] 7 6 5 7 [36,] 11 7 9 12 [37,] 10 10 8 7 [38,] 12 10 5 8 [39,] 10 13 10 9 [40,] 8 10 6 10
Updated on: 09-Nov-2021
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