How to get Column Names in a Matrix in R


How to get Column Names in a Matrix in R ?

Answer

To get the column names of a matrix in R, you can use the colnames() function. This function retrieves the column names as a vector.



✐ Examples

1 Get Column Names of a 2x2 Matrix

In this example,

  1. First, we create a 2x2 matrix named matrix1 using the matrix() function with a vector of values c(1, 2, 3, 4) and specify the number of rows as 2.
  2. We assign column names c('Col1', 'Col2') to the matrix using the colnames() function.
  3. To get the column names, we use the colnames() function on matrix1 and store the result in a variable called colNames1.
  4. Finally, we use the print() function to display the column names stored in colNames1.

R Program

matrix1 <- matrix(c(1, 2, 3, 4), nrow = 2)
colnames(matrix1) <- c('Col1', 'Col2')
colNames1 <- colnames(matrix1)
print(colNames1)

Output

[1] "Col1" "Col2"

2 Get Column Names of a 3x3 Matrix

In this example,

  1. We first create a 3x3 matrix named matrix2 using the matrix() function with a vector of values c(1, 2, 3, 4, 5, 6, 7, 8, 9) and specify the number of rows as 3.
  2. We assign column names c('X', 'Y', 'Z') to the matrix using the colnames() function.
  3. To get the column names, we use the colnames() function on matrix2 and store the result in a variable called colNames2.
  4. Finally, we use the print() function to display the column names stored in colNames2.

R Program

matrix2 <- matrix(c(1, 2, 3, 4, 5, 6, 7, 8, 9), nrow = 3)
colnames(matrix2) <- c('X', 'Y', 'Z')
colNames2 <- colnames(matrix2)
print(colNames2)

Output

[1] "X" "Y" "Z"

3 Get Column Names of a 4x2 Matrix

In this example,

  1. First, we create a 4x2 matrix named matrix3 using the matrix() function with a vector of values c(10, 20, 30, 40, 50, 60, 70, 80) and specify the number of rows as 4.
  2. We assign column names c('C1', 'C2') to the matrix using the colnames() function.
  3. To get the column names, we use the colnames() function on matrix3 and store the result in a variable called colNames3.
  4. Finally, we use the print() function to display the column names stored in colNames3.

R Program

matrix3 <- matrix(c(10, 20, 30, 40, 50, 60, 70, 80), nrow = 4)
colnames(matrix3) <- c('C1', 'C2')
colNames3 <- colnames(matrix3)
print(colNames3)

Output

[1] "C1" "C2"

Summary

In this tutorial, we learned How to get Column Names in a Matrix in R language with well detailed examples.




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