How to Delete Column & Row Names of Matrix in R (2 Examples)
In this article you’ll learn how to drop all row and column names of a matrix object in the R programming language.
Example Data
data(iris) # Load & modify example data iris_mat <- as.matrix(iris[ , 1:4]) rownames(iris_mat) <- 1:nrow(iris_mat) head(iris_mat) # Display head of example data # Sepal.Length Sepal.Width Petal.Length Petal.Width # 1 5.1 3.5 1.4 0.2 # 2 4.9 3.0 1.4 0.2 # 3 4.7 3.2 1.3 0.2 # 4 4.6 3.1 1.5 0.2 # 5 5.0 3.6 1.4 0.2 # 6 5.4 3.9 1.7 0.4 |
data(iris) # Load & modify example data iris_mat <- as.matrix(iris[ , 1:4]) rownames(iris_mat) <- 1:nrow(iris_mat) head(iris_mat) # Display head of example data # Sepal.Length Sepal.Width Petal.Length Petal.Width # 1 5.1 3.5 1.4 0.2 # 2 4.9 3.0 1.4 0.2 # 3 4.7 3.2 1.3 0.2 # 4 4.6 3.1 1.5 0.2 # 5 5.0 3.6 1.4 0.2 # 6 5.4 3.9 1.7 0.4
Example 1: Removing Matrix Column Names
colnames(iris_mat) <- NULL # Apply colnames() function head(iris_mat) # Displaying updated iris matrix # [,1] [,2] [,3] [,4] # 1 5.1 3.5 1.4 0.2 # 2 4.9 3.0 1.4 0.2 # 3 4.7 3.2 1.3 0.2 # 4 4.6 3.1 1.5 0.2 # 5 5.0 3.6 1.4 0.2 # 6 5.4 3.9 1.7 0.4 |
colnames(iris_mat) <- NULL # Apply colnames() function head(iris_mat) # Displaying updated iris matrix # [,1] [,2] [,3] [,4] # 1 5.1 3.5 1.4 0.2 # 2 4.9 3.0 1.4 0.2 # 3 4.7 3.2 1.3 0.2 # 4 4.6 3.1 1.5 0.2 # 5 5.0 3.6 1.4 0.2 # 6 5.4 3.9 1.7 0.4
Example 2: Removing Matrix Row Names
rownames(iris_mat) <- NULL # Apply rownames() function head(iris_mat) # Displaying updated iris matrix # [,1] [,2] [,3] [,4] # [1,] 5.1 3.5 1.4 0.2 # [2,] 4.9 3.0 1.4 0.2 # [3,] 4.7 3.2 1.3 0.2 # [4,] 4.6 3.1 1.5 0.2 # [5,] 5.0 3.6 1.4 0.2 # [6,] 5.4 3.9 1.7 0.4 |
rownames(iris_mat) <- NULL # Apply rownames() function head(iris_mat) # Displaying updated iris matrix # [,1] [,2] [,3] [,4] # [1,] 5.1 3.5 1.4 0.2 # [2,] 4.9 3.0 1.4 0.2 # [3,] 4.7 3.2 1.3 0.2 # [4,] 4.6 3.1 1.5 0.2 # [5,] 5.0 3.6 1.4 0.2 # [6,] 5.4 3.9 1.7 0.4
Related Articles
In the following, you can find some further resources on topics such as RStudio, extracting data, and matrices: