Here are 3 ways to retrieve all the column names in a DataFrame in R:
(1) Using the names() function:
column_names <- names(df)
(2) Using the colnames() function:
column_names <- colnames(df)
(3) Using the str() function which shows the DataFrame structure, including the column names:
str(df)
Examples of Getting the Column Names in a DataFrame in R
Here is a simple DataFrame in R with 3 columns:
df <- data.frame(product = c("computer", "monitor", "keyboard", "printer", "tablet"), price = c(800, 450, 100, 150, 300), brand = c("A", "B", "C", "X", "Y") ) print(df)
The resulted DataFrame:
product price brand
1 computer 800 A
2 monitor 450 B
3 keyboard 100 C
4 printer 150 X
5 tablet 300 YThe goal is to retrieve all the column names of this DataFrame.
(1) Using the names() function
Using the names() function:
df <- data.frame(product = c("computer", "monitor", "keyboard", "printer", "tablet"), price = c(800, 450, 100, 150, 300), brand = c("A", "B", "C", "X", "Y") ) column_names <- names(df) print(column_names)
The resulted column names:
"product" "price" "brand"(2) Using the colnames() function
Using the colnames() function:
df <- data.frame(product = c("computer", "monitor", "keyboard", "printer", "tablet"), price = c(800, 450, 100, 150, 300), brand = c("A", "B", "C", "X", "Y") ) column_names <- colnames(df) print(column_names)
The result:
"product" "price" "brand" (3) Using the str() function
Using the str() function:
df <- data.frame(product = c("computer", "monitor", "keyboard", "printer", "tablet"), price = c(800, 450, 100, 150, 300), brand = c("A", "B", "C", "X", "Y") ) str(df)
The result:
'data.frame': 5 obs. of 3 variables:
$ product: chr "computer" "monitor" ...
$ price : num 800 450 100 150 300
$ brand : chr "A" "B" "C" "X" ...