Dear I use *flights* database library(nycflights13) The following code is working as
colMeans(flights[2]) * 6.54851* but other code is not working as colMeans(flights$month) *Error in colMeans(flights$month) : * * 'x' must be an array of at least two dimensions* *flights[2]* is equal to the *month *column in database *Sincerely* Engin YILMAZ [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.