如何使用管道操作符将管道插入替换函数(如colnames()<-
)?
以下是我想做的:
library(dplyr)
averages_df <-
group_by(mtcars, cyl) %>%
summarise(mean(disp), mean(hp))
colnames(averages_df) <- c("cyl", "disp_mean", "hp_mean")
averages_df
# Source: local data frame [3 x 3]
#
# cyl disp_mean hp_mean
# 1 4 105.1364 82.63636
# 2 6 183.3143 122.28571
# 3 8 353.1000 209.21429
但理想的情况是:
averages_df <-
group_by(mtcars, cyl) %>%
summarise(mean(disp), mean(hp)) %>%
add_colnames(c("cyl", "disp_mean", "hp_mean"))
有没有一种方法可以做到这一点,而不必每次都编写一个特殊的函数?
这里的答案只是一个开始,但并不完全是我的问题:Chaining arithmetic operators in dplyr