Dplyr: “Error in n(): function should not be called directly”
I am attempting to reproduce one of the examples in the dplyr package but this error message. I am expecting to see a new column n produced with the frequency of each combination. Can someone tell me what I am missing? I triple checked that the package is loaded. Thanks for the help, as always.
library(dplyr)
# summarise peels off a single layer of grouping
by_vs_am <- group_by(mtcars, vs, am)
by_vs <- summarise(by_vs_am, n = n())
Error in n() : This function should not be called directly
To solve error: this function should not be called directly, you can try the following:
Make sure you load plyr first
Both dplyr and plyr have the functions summarise/summarize. Look at the outcomes of conflicts() to see masked objects.
Use summarize with the package, something like this
dplyr::summarize(count = n())
You can run this command to unload the plyr package.
detach("package:plyr", unload=TRUE)
Then you can continue as expected.
library(dplyr)
...
summarise(n = n())