You can use the following methods to add a new column to a matrix in R:
Method 1: Add New Column to End of Matrix
my_matrix
Method 2: Add New Column to Beginning of Matrix
my_matrix
Note that both methods use the cbind() function in R to column-bind a new column to the matrix.
The following examples show how to use each method in practice.
Example 1: Add New Column to End of Matrix
The following code shows how to use the cbind() function to add a new column to the last position of a matrix that contains the values 2, 7, 7, and 8:
#create matrix my_matrix 4) #view matrix my_matrix [,1] [,2] [,3] [1,] 14 7 9 [2,] 0 4 5 [3,] 12 1 5 [4,] 5 3 8 #add new column to end of matrix my_matrix #view updated matrix my_matrix [,1] [,2] [,3] [,4] [1,] 14 7 9 2 [2,] 0 4 5 7 [3,] 12 1 5 7 [4,] 5 3 8 8
Notice that one new column has been added to the end of the matrix.
Example 2: Add New Column to Beginning of Matrix
The following code shows how to use the cbind() function to add a new column to the first position of a matrix that contains the values 2, 7, 7, and 8:
#create matrix my_matrix 4) #view matrix my_matrix [,1] [,2] [,3] [1,] 14 7 9 [2,] 0 4 5 [3,] 12 1 5 [4,] 5 3 8 #add new column to beginning of matrix my_matrix #view updated matrix my_matrix [,1] [,2] [,3] [,4] [1,] 2 14 7 9 [2,] 7 0 4 5 [3,] 7 12 1 5 [4,] 8 5 3 8
Notice that one new column has been added to the beginning of the matrix.
Additional Resources
The following tutorials explain how to perform other common tasks in R:
How to Sort a Matrix in R
How to Remove NA from Matrix in R
How to Convert Data Frame to Matrix in R
How to Convert a Table to a Matrix in R