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

I am attempting to reproduce one of the examples in the dplyr package but am getting this error message. I am expecting to see a new column n produced with the frequency of each combination. What am I missing? I triple checked that the package is loaded.

 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

Solution

  • 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.