Error in across

[Unaimend]

data(iris)
iris %>%
  group_by(Species) %>%
  summarise(across(starts_with("Sepal"), ~ mean(.x, na.rm = TRUE)))

Results in following error
Error in across(): ! Must only be used inside data-masking verbs like mutate(), filter(), and group_by(). Run rlang::last_trace()to see where the error occurred. (ins)>

The code was copied from the documentation
https://dplyr.tidyverse.org/reference/across.html#:~:text=across()%20makes%20it%20easy,colwise%22)%20for%20more%20details.

[Unaimend]

This is definitely an issue with my current environment not with dplyr

[Unaimend]

The MASS package did mask the select function

[efisso]

I also have the same problem... I was able to run my code before but I guess with the latest update I get this error when I used group_by() and then summarise(across())... should I install MASS package to solve the issue?

[philibe]

When you have issues with masked functions, you have to prefix by the name of the package (or change the order of the loadind)

• library(AAA) with function select
• library(BBB) with function select
• => Therefore select will call select of BBB except if you write AAA::select()

For example if you load a package containing the select function after the loading of dplyr, the select won't be that of dplyr.