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How to combine matrices having same number of columns in R?
The matrices that have same number of columns can be combined by rows. For example, if we have five matrices list, each having six columns then those matrices can be converted into a single matric by joining the rows of those matrices. It can be done by using do.call(rbind,”List_of_matrices_object_name”).
Example
Consider the below matrices and their list −
M1<-matrix(1:36,nrow=6) M1
Output
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 7 13 19 25 31 [2,] 2 8 14 20 26 32 [3,] 3 9 15 21 27 33 [4,] 4 10 16 22 28 34 [5,] 5 11 17 23 29 35 [6,] 6 12 18 24 30 36
Example
M2<-matrix(sample(1:10,30,replace=TRUE),ncol=6) M2
Output
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 6 5 5 5 4 6 [2,] 6 1 9 8 8 4 [3,] 10 3 9 3 7 10 [4,] 9 4 4 9 9 9 [5,] 4 9 6 6 5 5
Example
M3<-matrix(sample(1:50,30),ncol=6) M3
Output
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 27 25 24 45 18 21 [2,] 22 46 9 34 26 44 [3,] 23 33 29 47 4 37 [4,] 41 31 39 50 19 15 [5,] 5 17 40 11 20 35
Example
M4<-matrix(rpois(36,5),ncol=6) M4
Output
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 12 4 5 6 3 5 [2,] 6 6 1 9 3 6 [3,] 3 4 3 2 10 5 [4,] 1 6 8 9 6 7 [5,] 3 6 5 4 4 3 [6,] 8 4 1 7 9 4
Example
M5<-matrix(round(runif(36,2,5)),ncol=6) M5
Output
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 2 4 4 3 4 4 [2,] 3 5 3 2 3 5 [3,] 2 5 2 4 4 2 [4,] 4 3 2 4 5 5 [5,] 3 3 3 3 3 3 [6,] 2 5 2 3 4 2
Example
List_M<-list(M1,M2,M3,M4,M5) List_M
Output
[[1]] [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 7 13 19 25 31 [2,] 2 8 14 20 26 32 [3,] 3 9 15 21 27 33 [4,] 4 10 16 22 28 34 [5,] 5 11 17 23 29 35 [6,] 6 12 18 24 30 36 [[2]] [,1] [,2] [,3] [,4] [,5] [,6] [1,] 6 5 5 5 4 6 [2,] 6 1 9 8 8 4 [3,] 10 3 9 3 7 10 [4,] 9 4 4 9 9 9 [5,] 4 9 6 6 5 5 [[3]] [,1] [,2] [,3] [,4] [,5] [,6] [1,] 27 25 24 45 18 21 [2,] 22 46 9 34 26 44 [3,] 23 33 29 47 4 37 [4,] 41 31 39 50 19 15 [5,] 5 17 40 11 20 35 [[4]] [,1] [,2] [,3] [,4] [,5] [,6] [1,] 2 4 2 3 5 2 [2,] 3 3 3 3 4 4 [3,] 4 4 3 4 2 3 [4,] 2 4 4 4 3 4 [5,] 4 5 5 3 2 3 [6,] 4 3 4 4 4 3 [[5]] [,1] [,2] [,3] [,4] [,5] [,6] [1,] 2 4 4 3 4 4 [2,] 3 5 3 2 3 5 [3,] 2 5 2 4 4 2 [4,] 4 3 2 4 5 5 [5,] 3 3 3 3 3 3 [6,] 2 5 2 3 4 2
Combining list of matrices into a single matrix by rows −
Example
do.call(rbind,List_M)
Output
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 7 13 19 25 31 [2,] 2 8 14 20 26 32 [3,] 3 9 15 21 27 33 [4,] 4 10 16 22 28 34 [5,] 5 11 17 23 29 35 [6,] 6 12 18 24 30 36 [7,] 6 5 5 5 4 6 [8,] 6 1 9 8 8 4 [9,] 10 3 9 3 7 10 [10,] 9 4 4 9 9 9 [11,] 4 9 6 6 5 5 [12,] 27 25 24 45 18 21 [13,] 22 46 9 34 26 44 [14,] 23 33 29 47 4 \37 [15,] 41 31 39 50 19 15 [16,] 5 17 40 11 20 35 [17,] 2 4 2 3 5 2 [18,] 3 3 3 3 4 4 [19,] 4 4 3 4 2 3 [20,] 2 4 4 4 3 4 [21,] 4 5 5 3 2 3 [22,] 4 3 4 4 4 3 [23,] 2 4 4 3 4 4 [24,] 3 5 3 2 3 5 [25,] 2 5 2 4 4 2 [26,] 4 3 2 4 5 5 [27,] 3 3 3 3 3 3 [28,] 2 5 2 3 4 2
Updated on: 2020-09-08T13:56:09+05:30
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