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# How to remove a row from matrix in R by using its name?

To remove a row from matrix in R by using its name, we can follow the below steps −

First of all, create a matrix.

Then, add names to rows of the matrix.

After that, subset the matrix by deselecting the desired row 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,] 6 0 5 7 [2,] 2 6 8 7 [3,] 9 6 5 5 [4,] 4 8 3 8 [5,] 6 4 2 9 [6,] 3 4 4 9 [7,] 7 6 5 6 [8,] 4 5 7 2 [9,] 7 5 9 8 [10,] 5 7 8 5 [11,] 7 9 5 8 [12,] 9 2 4 8 [13,] 7 2 4 5 [14,] 2 6 8 4 [15,] 8 4 7 7 [16,] 5 3 3 2 [17,] 6 5 5 5 [18,] 5 7 8 5 [19,] 6 5 5 5 [20,] 2 9 6 4 [21,] 5 3 7 7 [22,] 5 3 12 5 [23,] 8 3 3 5 [24,] 7 3 6 1 [25,] 3 3 5 7

**Add the row names**

Using rownames function to add the row names to matrix M −

M<-matrix(rpois(100,5),ncol=4) rownames(M)<-LETTERS[1:25] M

## Output

[,1] [,2] [,3] [,4] A 6 0 5 7 B 2 6 8 7 C 9 6 5 5 D 4 8 3 8 E 6 4 2 9 F 3 4 4 9 G 7 6 5 6 H 4 5 7 2 I 7 5 9 8 J 5 7 8 5 K 7 9 5 8 L 9 2 4 8 M 7 2 4 5 N 2 6 8 4 O 8 4 7 7 P 5 3 3 2 Q 6 5 5 5 R 5 7 8 5 S 6 5 5 5 T 2 9 6 4 U 5 3 7 7 V 5 3 12 5 W 8 3 3 5 X 7 3 6 1 Y 3 3 5 7

**Remove the row from matrix using row name**

Subset the matrix by deselecting the row A with negation and single square brackets as shown below −

M<-matrix(rpois(100,5),ncol=4) rownames(M)<-LETTERS[1:25] M<-M[rownames(M)!="A",] M

## Output

[,1] [,2] [,3] [,4] B 2 6 8 7 C 9 6 5 5 D 4 8 3 8 E 6 4 2 9 F 3 4 4 9 G 7 6 5 6 H 4 5 7 2 I 7 5 9 8 J 5 7 8 5 K 7 9 5 8 L 9 2 4 8 M 7 2 4 5 N 2 6 8 4 O 8 4 7 7 P 5 3 3 2 Q 6 5 5 5 R 5 7 8 5 S 6 5 5 5 T 2 9 6 4 U 5 3 7 7 V 5 3 12 5 W 8 3 3 5 X 7 3 6 1 Y 3 3 5 7

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