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Message-ID: <CAF8bMca+ZaiVH0A9wKCgyhV_gO9rchYV_THpyVNOiOrawqjPJQ@mail.gmail.com> Date: 2014-08-07T15:36:26Z From: William Dunlap Subject: ask for help In-Reply-To: <7C35CC8C-6BC0-469D-858D-463CB09EC09B@kasterma.net> I prefer the idiom c(TRUE, a[-1] != a[-length(x)]) because it works for character and other data types as well. I also find that thinking in terms of runs instead of subscripting tricks is easier.