r-需要每X行过滤一列

Question

我有一个带日期的列，我想过滤每X行。

df <- read.table(text = 'date
01-02-2010  
02-02-2010  
03-02-2010  
07-02-2010  
08-02-2010  
09-02-2010
10-02-2010
11-02-2010  
12-02-2010  
13-02-2010
14-02-2010 ', header = TRUE) 

Answer 1

library(dplyr)
iris |> 
mutate(row = row_number()) |> 
filter(row %% 3 == 0) # Change the value 3 to whatever you are looking for.