Dear all, I have noticed a little change in the behaviour of as.factor from R-2.2.1 to R-2.3.0, and can't find it in the NEWS.
In R-2.3.0: > times <- 1:5 > class(times) <- "Date" > as.factor(times) [1] 1 2 3 4 5 Levels: 1 2 3 4 5 In R-2.2.1: > as.factor(times) [1] 1970-01-02 1970-01-03 1970-01-04 1970-01-05 1970-01-06 Levels: 1970-01-02 1970-01-03 1970-01-04 1970-01-05 1970-01-06 Is this the intended behaviour? Note that the change is reflected on other functions which seems to use as.factor internally, for example 'tapply'. Consider the following code: times <- 1:5 class(times) <- "Date" id <- rep(times, each=2) vals <- rep(1:2,5) tapply(vals, id, mean) Under R-2.2.1 this gives: 1970-01-02 1970-01-03 1970-01-04 1970-01-05 1970-01-06 1.5 1.5 1.5 1.5 1.5 But under R-2.3.0 the output is: 1 2 3 4 5 1.5 1.5 1.5 1.5 1.5 Antonio, Fabio Di Narzo. [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html