*27*

You can use the following functions in R to display the size of a given data frame:

**nrow**: Display number of rows in data frame**ncol**: Display number of columns in data frame**dim**: Display dimensions (rows and columns) of data frame

The following examples show how to use each of these functions in practice with the following data frame:

#create data frame df frame(team=c('A', 'B', 'C', 'D', 'E', 'F'), points=c(99, 90, 86, 88, 95, 99), assists=c(33, 28, 31, 39, 34, 25), rebounds=c(12, NA, 24, 24, 28, 33)) #view data frame df team points assists rebounds 1 A 99 33 12 2 B 90 28 NA 3 C 86 31 24 4 D 88 39 24 5 E 95 34 28 6 F 99 25 33

**Example 1: Use nrow() to Display Number of Rows**

The following code shows how to use the **nrow()** function to display the total number of rows in the data frame:

#display total number of rows in data frame nrow(df) [1] 6

There are **6** total rows.

Note that we can also use the complete.cases() function to display the total number of rows with no NA values:

#display total number of rows in data frame with no NA values nrow(df[complete.cases(df), ]) [1] 5

There are **5** total rows that have no NA values.

**Example 2: Use ncol() to Display Number of Columns**

The following code shows how to use the **ncol()** function to display the total number of columns in the data frame:

#display total number of columns in data frame ncol(df) [1] 4

There are **4** total columns.

**Example 3: Use dim() to Display Dimensions**

The following code shows how to use the **dim()** function to display the dimensions (rows and columns) of the data frame:

#display dimensions of data frame dim(df) [1] 6 4

This tells us there are **6** rows and **4** columns in the data frame.

You can also use brackets with the **dim()** function to display only the rows or columns:

#display number of rows of data frame dim(df)[1] [1] 6 #display number of columns of data frame dim(df)[2] [1] 4

**Additional Resources**

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

How to Use rowSums() Function in R

How to Apply Function to Each Row in Data Frame in R

How to Remove Rows from Data Frame in R Based on Condition