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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.
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.