[R] Mean of difftime vectors : code infelicity or intended behaviour ?

Dear list, + (and -) being defined for difftime class, I expected mean() to return something sensible. This is only half-true : mean(c(1:5, 5:1),na.rm=TRUE) [1] 3 mean(as.difftime(c(1:5, 5:1),unit=mins),na.rm=TRUE) Time difference of 3 mins Fine so far. However : mean(c(1:5,

Re: [R] Mean of difftime vectors : code infelicity or intended behaviour ?

Oops. Clicked Send too fast (don't shoot, Brian !). I forgot : sessionInfo() R version 2.8.1 (2008-12-22) i486-pc-linux-gnu locale: LC_CTYPE=fr_FR.UTF-8;LC_NUMERIC=C;LC_TIME=fr_FR.UTF-8;LC_COLLATE=fr_FR.UTF-8; LC_MONETARY=C;LC_MESSAGES=fr_FR.UTF-8;LC_PAPER=fr_FR.UTF-8;LC_NAME=C;