Remove Columns from a data frame, you may occasionally need to remove one or more columns from a data frame. Fortunately, the select() method from the dplyr package makes this simple.
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library(dplyr)
Using the data frame below, this tutorial demonstrates numerous examples of how to utilize this function in practice.
Remove Columns from a data frame
Let’s create a data frame
df <- data.frame(player = c('P1', 'P2', 'P3', 'P4', 'P5', 'P6', 'P7'),
points = c(122, 144, 154, 155, 120, 218, 229),
assists = c(43, 55, 77, 18, 114, NA,29))Now we can view the data frame
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df
player points assists 1 P1 122 43 2 P2 144 55 3 P3 154 77 4 P4 155 18 5 P5 120 114 6 P6 218 NA 7 P7 229 29
Approach 1: Remove Columns by Name
How to delete columns from a data frame by name is demonstrated in the following code.
delete the ‘points’ column
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df %>% select(-points)
player assists 1 P1 43 2 P2 55 3 P3 77 4 P4 18 5 P5 114 6 P6 NA 7 P7 29
Approach 2: Remove Columns in the List
The code below demonstrates how to delete columns from a data frame that belong to a certain list.
‘Points’ and ‘player’ columns should be removed.
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df %>% select(-one_of('points', 'player'))assists 1 43 2 55 3 77 4 18 5 114 6 NA 7 29
Approach 3: Remove Columns in Range
To remove all columns in the range from ‘position’ to ‘points,’ use the following code.
delete columns from ‘player’ to ‘points’ in the range.
df %>% select(-(player:points))
assists 1 43 2 55 3 77 4 18 5 114 6 NA 7 29
Approach 4: Remove Columns that Contain a Phrase
The code below demonstrates how to delete all columns containing the word ‘points.’
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delete columns with the word ‘points’ in them.
df %>% select(-contains('points'))player assists 1 P1 43 2 P2 55 3 P3 77 4 P4 18 5 P5 114 6 P6 NA 7 P7 29
Approach 5: Remove Columns that Start with Certain Letters
To eliminate all columns that begin with the letters ‘po,’ use the following code.
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delete columns that begin with the letter ‘po’
df %>% select(-starts_with('po'))player assists 1 P1 43 2 P2 55 3 P3 77 4 P4 18 5 P5 114 6 P6 NA 7 P7 29
Approach 6: Remove Columns that End with Certain Letters
To eliminate all columns that finish in the letter’s,’ use the following code:
‘s’-ending columns should be removed.
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df %>% select(-ends_with('s'))player 1 P1 2 P2 3 P3 4 P4 5 P5 6 P6 7 P7
Approach 7: Remove Columns by Position
The code below demonstrates how to remove columns from certain locations:
Columns 1 and 3 should be removed.
df %>% select(-1, -3)
points 1 122 2 144 3 154 4 155 5 120 6 218 7 229
