ncol()

The ncol() function returns the number of columns in a data frame.

Syntax

ncol(df_object)

The df_object parameter is the data frame passed into the ncol() function.

Example

The following example uses a CSV file named patients.csv with the following information:

The data within the file can be read in and the ncol() function can be used to retrieve the number of columns:

# Read file
df <- read.csv("patients.csv")

# Retrieve number of columns
ncol(df)

This results in the following output:

3