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How to remove multiple columns from matrix in R by using their names?
To remove multiple columns from matrix in R by using their names, we can follow the below steps −
First of all, create a matrix.
Then, add names to columns of the matrix.
After that, subset the matrix by deselecting the desired columns with negation and single square brackets for subsetting.
Example
Create the matrix
Let’s create a matrix as shown below −
M<-matrix(rpois(100,5),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,] 3 5 6 6 [2,] 4 1 3 5 [3,] 5 6 3 3 [4,] 4 6 8 6 [5,] 5 9 2 5 [6,] 1 6 7 5 [7,] 7 1 5 6 [8,] 5 6 4 6 [9,] 1 5 11 7 [10,] 3 3 6 4 [11,] 3 5 8 5 [12,] 1 10 3 1 [13,] 7 10 3 4 [14,] 5 6 4 5 [15,] 11 6 13 5 [16,] 8 4 6 1 [17,] 1 3 5 5 [18,] 2 7 7 7 [19,] 5 6 2 8 [20,] 6 4 6 7 [21,] 5 7 3 10 [22,] 4 5 1 2 [23,] 6 2 4 3 [24,] 4 5 4 4 [25,] 3 11 4 3
Add the column names
Using colnames function to add the column names to matrix M −
M<-matrix(rpois(100,5),ncol=4)
colnames(M)<-c("Grp1","Grp2","Grp3","Grp4")
MOutput
Grp1 Grp2 Grp3 Grp4 [1,] 3 5 6 6 [2,] 4 1 3 5 [3,] 5 6 3 3 [4,] 4 6 8 6 [5,] 5 9 2 5 [6,] 1 6 7 5 [7,] 7 1 5 6 [8,] 5 6 4 6 [9,] 1 5 11 7 [10,] 3 3 6 4 [11,] 3 5 8 5 [12,] 1 10 3 1 [13,] 7 10 3 4 [14,] 5 6 4 5 [15,] 11 6 13 5 [16,] 8 4 6 1 [17,] 1 3 5 5 [18,] 2 7 7 7 [19,] 5 6 2 8 [20,] 6 4 6 7 [21,] 5 7 3 10 [22,] 4 5 1 2 [23,] 6 2 4 3 [24,] 4 5 4 4 [25,] 3 11 4 3
Updated on: 08-Nov-2021
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