On 5/22/20 18:12, brodie gaslam wrote:
FWIW what convinces me is consistency with other aggregating functions applied to zero length inputs: sum(numeric(0)) ## [1] 0
Right. And 1 is the identity element of multiplication: > prod(numeric(0)) [1] 1And the empty string is the identity element of string aggregation by concatenation.
H. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel