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：

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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) >