Dear all, I don't know if you consider this a bug or feature, but it breaks reasonable code: 'unlist' and 'sapply' convert 'ordered' to 'factor' even if all levels are equal. Here is a simple example:
o <- ordered(letters) o[[1]] lapply(o, min)[[1]] # ordered factor unlist(lapply(o, min))[[1]] # no longer ordered sapply(o, min)[[1]] # no longer ordered Jens Oehlschlägel P.S: The above examples are silly for simple reproduction. The current behavior broke my use-case which had a structure like this # have some data x <- 1:20 # apply some function to each element somefunc <- function(x){ # do something and return an ordinal level sample(o, 1) } x <- sapply(x, somefunc) # get minimum result min(x) # Error in Summary.factor(c(2L, 26L), na.rm = FALSE) : # ‘min’ not meaningful for factors > version _ platform x86_64-pc-linux-gnu arch x86_64 os linux-gnu system x86_64, linux-gnu status major 3 minor 4.0 year 2017 month 04 day 21 svn rev 72570 language R version.string R version 3.4.0 (2017-04-21) nickname You Stupid Darkness ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel