[問題] dplyr的小問題
[問題敘述]:
剛剛回去看一下dplyr的introduction
裡面有個小範例，若用forward-pipe operator就會出錯
搞不懂為啥，上來諮詢一下
[程式範例]:
#Example in Introduction
library(nycflights13)
library(dplyr)
by_tailnum <- group_by(flights, tailnum)
delay1 <- summarise(by_tailnum,
count = n(),
dist = mean(distance, na.rm = TRUE),
delay = mean(arr_delay, na.rm = TRUE))
filter(delay1, count > 20, dist < 2000)
#Using forward-pipe
library(magrittr)
delay2 = flights %>% group_by(tailnum) %>%
summarise(conut = n(),
dist = mean(distance,na.rm=TRUE),
delay = mean(arr_delay,na.rm = TRUE))
filter(delay2, count > 20, dist < 2000)
#Error: comparison (6) is possible only for atomic and list types
identical(delay1,delay2)
[1] FALSE
請問為什麼兩種指令下出來的結果會不一樣啊?
都是group_by之後summarise
只不過一個step-by-step，一個用foward-pipe operator
有前輩能解惑一下嗎?
感謝了
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