Select only the first rows for each unique value of a column in R
- by dmvianna
From a dataframe like this
test <- data.frame('id'= rep(1:5,2), 'string'= LETTERS[1:10])
test <- test[order(test$id), ]
rownames(test) <- 1:10
> test
id string
1 1 A
2 1 F
3 2 B
4 2 G
5 3 C
6 3 H
7 4 D
8 4 I
9 5 E
10 5 J
I want to create a new one…
