Return Column Name of Largest Value for Each Row in R DataFrame
Last Updated :
23 Sep, 2021
In this article, we will discuss how to return column names of the largest value for each row in DataFrame in R Programming Language.
Example:
|
Column1 |
Column2 |
Column3 |
Max column |
Row1 |
2 |
0 |
0 |
Column1 , Because, Column2 value and Column 3 value is less than Column1 |
Row2 |
4 |
3 |
5 |
Column3 , Because, Column2 value and Column 1 value is less than Column3 |
Row3 |
10 |
6 |
6 |
Column1 , Because, Column2 value and Column 3 value is less than Column1 |
Row4 |
9 |
5 |
4 |
Column1 , Because, Column2 value and Column 3 value is less than Column1 |
Row5 |
7 |
9 |
3 |
Column2 , Because, Column1 value and Column 3 value is less than Column2 |
So For this implementation we will use colnames() and max.col() functions
Syntax:
colnames(dataframe)[max.col(dataframe)]
Here,
- colnames() is used to get the column names
- max.col() is used to return the maximum column name of the dataframe
Example: R program to get the largest column name in all rows
R
data = data.frame (subject1= c (91, 62, 93),
subject2= c (98, 79, 70),
subject3= c (100, 78, 98))
print ( colnames (data)[ max.col (data)])
|
Output:
[1] "subject3" "subject2" "subject3"
Example: R program to get the largest column name in all rows
R
data = data.frame (subject1= c (91, 62, 93, 56, 78),
subject2= c (98, 79, 70, 56, 78),
subject3= c (100, 78, 98, 56, 71))
print ( colnames (data)[ max.col (data)])
|
Output:
[1] "subject3" "subject1" "subject3" "subject1" "subject2"
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