Here is the code: summary(c(1:5, NA)) summary(c("a", NA))
It seems in the firs case the number of NAs is reported, but not in the second. Tested with R 3.3.1 on a mac. Best regards, Kaiyin ZHONG [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel