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How to replace matrix values using if else in R?
To replace matrix values using ifelse in R, we can follow the below steps −
- First of all, create a matrix.
- Then, use ifelse function to replace the values in the matrix.
Create the matrix
Let’s create a matrix as shown below −
M<-matrix(rpois(80,2),ncol=4) M
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
[,1] [,2] [,3] [,4] [1,] 3 4 1 2 [2,] 5 0 2 0 [3,] 1 3 1 1 [4,] 3 3 1 2 [5,] 3 2 4 3 [6,] 2 3 3 2 [7,] 3 4 3 2 [8,] 1 2 0 3 [9,] 2 2 0 3 [10,] 3 4 4 1 [11,] 3 1 1 2 [12,] 2 2 1 0 [13,] 2 0 3 3 [14,] 1 3 4 3 [15,] 2 5 0 3 [16,] 2 1 2 1 [17,] 2 6 3 2 [18,] 2 3 3 2 [19,] 3 6 2 1 [20,] 3 2 2 2
Replace values in the matrix using if else
Using if else function to replace 3 in matrix M with 1 −
M<-matrix(rpois(80,2),ncol=4) ifelse(M==3,1,M)
Output
[,1] [,2] [,3] [,4] [1,] 1 4 1 2 [2,] 5 0 2 0 [3,] 1 1 1 1 [4,] 1 1 1 2 [5,] 1 2 4 1 [6,] 2 1 1 2 [7,] 1 4 1 2 [8,] 1 2 0 1 [9,] 2 2 0 1 [10,] 1 4 4 1 [11,] 1 1 1 2 [12,] 2 2 1 0 [13,] 2 0 1 1 [14,] 1 1 4 1 [15,] 2 5 0 1 [16,] 2 1 2 1 [17,] 2 6 1 2 [18,] 2 1 1 2 [19,] 1 6 2 1 [20,] 1 2 2 2
Updated on: 13-Aug-2021
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