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How to check if a matrix in R is in binary form?
A binary matrix contains values in form of twos such as 0/1, 1/2, Yes/No etc. If we have a matrix that has some values and we expect that there are only two values in the whole matrix then we can check whether only those two values exist in the matrix or not. For example, if we have a matrix called M then we can check whether it contains only 0/1 in the matrix by using the command all(M %in% 0:1).
Example1
> M1<-matrix(sample(0:1,80,replace=TRUE),ncol=4) > M1
Output
[,1] [,2] [,3] [,4] [1,] 0 0 0 1 [2,] 0 0 1 1 [3,] 0 0 0 1 [4,] 0 0 0 0 [5,] 0 1 0 1 [6,] 0 1 0 1 [7,] 0 1 1 1 [8,] 1 0 1 0 [9,] 0 1 0 0 [10,] 0 1 1 0 [11,] 0 0 1 0 [12,] 1 1 1 1 [13,] 1 1 1 0 [14,] 1 1 1 1 [15,] 1 1 1 1 [16,] 0 0 0 0 [17,] 0 0 1 0 [18,] 1 1 1 1 [19,] 0 0 0 0 [20,] 0 1 0 1
Checking whether M1 contains only 0/1 or not −
> all(M1 %in% 0:1)
Output
[1] TRUE
Example2
> M2<-matrix(sample(1:2,40,replace=TRUE),ncol=2) > M2
Output
[,1] [,2] [1,] 2 2 [2,] 1 2 [3,] 2 2 [4,] 2 1 [5,] 2 2 [6,] 2 1 [7,] 2 2 [8,] 1 1 [9,] 2 2 [10,] 2 2 [11,] 1 2 [12,] 2 2 [13,] 1 2 [14,] 2 1 [15,] 2 1 [16,] 2 2 [17,] 2 2 [18,] 1 2 [19,] 1 2 [20,] 2 1
Checking whether M2 contains only 1/2 or not −
> all(M2 %in% 1:2)
Output
[1] TRUE
Example3
> M3<-matrix(sample(c("Yes","No"),40,replace=TRUE),ncol=2)
> M3Output
[,1] [,2] [1,] "Yes" "No" [2,] "No" "Yes" [3,] "Yes" "No" [4,] "Yes" "Yes" [5,] "No" "No" [6,] "Yes" "Yes" [7,] "Yes" "Yes" [8,] "Yes" "No" [9,] "No" "Yes" [10,] "No" "Yes" [11,] "No" "Yes" [12,] "Yes" "No" [13,] "Yes" "No" [14,] "No" "Yes" [15,] "Yes" "No" [16,] "No" "No" [17,] "No" "Yes" [18,] "No" "No" [19,] "No" "No" [20,] "Yes" "Yes"
Checking whether M3 contains only True/False or not −
> all(M3 %in% c("True","False"))Output
[1] FALSE
Updated on: 06-Mar-2021
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