Hi, I am wondering if there is an option to control how R sort characters on different machines. For example, on my Mac OS X > sort(c("H", "a"), decreasing = TRUE) [1] "a" "H" The same command on a Linux machine gives me > sort(c("H", "a"), decreasing = TRUE) [1] "H" "a" I don't know if there is an option to control the behavior of 'sort'. Thanks, Wen