You can use one of the following two methods to convert a matrix to a data frame in R:

**Method 1: Convert Matrix to Data Frame Using Base R**

#convert matrix to data frame df <- as.data.frame(mat) #specify column names colnames(df) <- c('first', 'second', 'third', ...)

**Method 2: Convert Matrix to Data Frame Using Tibble Package**

library(tibble) #convert matrix to data frame and specify column names df <- mat %>% as_tibble() %>% setNames(c('first', 'second', 'third', ...))

The following examples show how to use each method in practice with the following matrix in R:

#create matrix mat <- matrix(1:21, nrow=7) #view matrix mat [,1] [,2] [,3] [1,] 1 8 15 [2,] 2 9 16 [3,] 3 10 17 [4,] 4 11 18 [5,] 5 12 19 [6,] 6 13 20 [7,] 7 14 21

**Example 1: Convert Matrix to Data Frame Using Base R**

The following code shows how to convert a matrix to a data frame using base R:

#convert matrix to data frame df <- as.data.frame(mat) #specify columns of data frame colnames(df) <- c('first', 'second', 'third') #view structure of data frame str(df) 'data.frame': 7 obs. of 3 variables: $ first : int 1 2 3 4 5 6 7 $ second: int 8 9 10 11 12 13 14 $ third : int 15 16 17 18 19 20 21

From the output we can see that the matrix has been converted to a data frame with seven observations (rows) and 3 variables (columns).

**Example 2: Convert Matrix to Data Frame Using Tibble Package**

The following code shows how to convert a matrix to a tibble in R:

library(tibble) #convert matrix to tibble df <- mat %>% as_tibble() %>% setNames(c('first', 'second', 'third')) #view tibble df # A tibble: 7 x 3 first second third 1 1 8 15 2 2 9 16 3 3 10 17 4 4 11 18 5 5 12 19 6 6 13 20 7 7 14 21

From the output we can see that the matrix has been converted to a tibble with 7 rows and 3 columns.

**Note**: There are many benefits to using tibbles instead of data frames, especially with extremely large datasets. Read about some of the benefits here.

**Additional Resources**

The following tutorials explain how to perform other common tasks in R:

How to Convert Matrix to Vector in R

How to Convert Data Frame to Matrix in R

How to Convert List to Matrix in R