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 <- cbind(my_matrix, c(2, 7, 7, 8))

**Method 2: Add New Column to Beginning of Matrix**

my_matrix <- cbind(c(2, 7, 7, 8), 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 <- matrix(c(14, 0, 12, 5, 7, 4, 1, 3, 9, 5, 5, 8), nrow=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 <- cbind(my_matrix, c(2, 7, 7, 8)) #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 <- matrix(c(14, 0, 12, 5, 7, 4, 1, 3, 9, 5, 5, 8), nrow=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 <- cbind(c(2, 7, 7, 8), 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