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How to convert a matrix to binary matrix in R?
To convert a matrix to binary matrix, we can use as.matrix function and converting the matrix to logical matrix then adding 0 to the values greater than 0. For example, if we have a matrix called M then it can be converted to a binary matrix using the command −
as.matrix((M<0)+0)
Check out the below examples and try to do it in breaks to understand how it works.
Example1
M1<-matrix(rpois(40,1),ncol=2) M1
Output
[,1] [,2] [1,] 0 1 [2,] 1 1 [3,] 4 1 [4,] 1 0 [5,] 1 1 [6,] 3 3 [7,] 3 0 [8,] 2 2 [9,] 1 1 [10,] 2 0 [11,] 2 0 [12,] 0 0 [13,] 1 0 [14,] 0 2 [15,] 2 1 [16,] 3 2 [17,] 2 1 [18,] 0 1 [19,] 1 2 [20,] 3 0
as.matrix((M1>0)+0)
[,1] [,2] [1,] 0 1 [2,] 1 1 [3,] 1 1 [4,] 1 0 [5,] 1 1 [6,] 1 1 [7,] 1 0 [8,] 1 1 [9,] 1 1 [10,] 1 0 [11,] 1 0 [12,] 0 0 [13,] 1 0 [14,] 0 1 [15,] 1 1 [16,] 1 1 [17,] 1 1 [18,] 0 1 [19,] 1 1 [20,] 1 0
Example2
M2<-matrix(rpois(80,2),ncol=4) M2
Output
[,1] [,2] [,3] [,4] [1,] 2 2 2 4 [2,] 4 5 1 0 [3,] 1 2 2 4 [4,] 2 0 1 2 [5,] 4 1 2 3 [6,] 3 0 1 0 [7,] 0 2 3 0 [8,] 2 1 2 0 [9,] 2 0 2 1 [10,] 2 3 1 2 [11,] 2 4 1 3 [12,] 1 3 0 2 [13,] 2 2 3 2 [14,] 0 2 1 1 [15,] 4 2 1 5 [16,] 1 3 1 1 [17,] 4 0 0 1 [18,] 3 3 3 1 [19,] 1 0 0 3 [20,] 3 0 0 0
as.matrix((M2>0)+0)
[,1] [,2] [,3] [,4] [1,] 1 1 1 1 [2,] 1 1 1 0 [3,] 1 1 1 1 [4,] 1 0 1 1 [5,] 1 1 1 1 [6,] 1 0 1 0 [7,] 0 1 1 0 [8,] 1 1 1 0 [9,] 1 0 1 1 [10,] 1 1 1 1 [11,] 1 1 1 1 [12,] 1 1 0 1 [13,] 1 1 1 1 [14,] 0 1 1 1 [15,] 1 1 1 1 [16,] 1 1 1 1 [17,] 1 0 0 1 [18,] 1 1 1 1 [19,] 1 0 0 1 [20,] 1 0 0 0
Updated on: 06-Mar-2021
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