Unused argument in summarise n() R

问题

I am trying to run the following code:

 DF2 %>%

 group_by(doy, yearadded) %>%

 summarise(n_entries= n(doy, yearadded))

Which gives me the error:

Error in n(doy, yearadded) : unused arguments (doy, yearadded)

My yearadded field is a character class and doy is a numeric, is that why it's not working or is there some other reason?

回答1:

The n() doesn't take any arguments. It would be

library(dplyr)
DF2 %>%
 group_by(doy, yearadded) %>%
 summarise(n_entries= n())

---

Or more compactly

count(DF2, doy, yearadded)

来源：https://stackoverflow.com/questions/55259295/unused-argument-in-summarise-n-r