Error in select(., cyl, mpg) : unused arguments (cyl, mpg)

目录

Error in select(., cyl, mpg) : unused arguments (cyl, mpg)

问题：

解决：

完整错误：

问题：

#由于来自MASS包的select（）函数与来自dplyr包的select（）函数冲突，因此会发生错误。

library(dplyr)
library(MASS)

#find average mpg grouped by 'cyl'
mtcars %>%
  select(cyl, mpg) %>%
  group_by(cyl) %>%
  summarise(avg_mpg = mean(mpg))

解决：

#指定使用那个包的select函数就好了

library(dplyr)
library(MASS)

#find average mpg grouped by 'cyl'
mtcars %>%
  dplyr::select(cyl, mpg) %>%
  group_by(cyl) %>%
  summarise(avg_mpg = mean(mpg))

完整错误：

> library(dplyr)
> library(MASS)
> 
> #find average mpg grouped by 'cyl'
> mtcars %>%
+     select(cyl, mpg) %>%
+     group_by(cyl) %>%
+     summarise(avg_mpg = mean(mpg))
Error in select(., cyl, mpg) : unused arguments (cyl, mpg)
>