dplyr: "Error in n(): function should not be called directly"

r function plyr dplyr conflicting-libraries

I presume you have dplyr and plyr loaded in the same session. dplyr is not plyr. ddply is not a function in the dplyr package.

Both dplyr and plyr have the functions summarise/summarize.

Look at the results of conflicts() to see masked objects.

r function plyr dplyr conflicting-libraries

As mentioned by the previous answer, you may have a conflict between plyr and dplyr. You can to run this command to unload the plyr package.

detach("package:plyr", unload=TRUE)

Then you can continue as expected.

library(dplyr) ...summarise(n = n())

r function plyr dplyr conflicting-libraries

To avoid confusions with masking functions, it is clear to use the "package::function" specification, like example below:

delay <- dplyr::summarise(by_tailnum,   count = n(),   dist = mean(distance, na.rm = TRUE),   delay = mean(arr_delay, na.rm = TRUE))

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