@hadleywickham I used to do this, but stopped since it gives warnings when the input is a vector. Only 1st arg used.pic.twitter.com/KN6mKDB8mG
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@KirkegaardEmil works fine for me
@hadleywickham No error, but doesn't do as intended because is.null() only checks the first value in the vector. Can be a problem sometimes.
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@KirkegaardEmil NULL is not NAThanks. Twitter will use this to make your timeline better. UndoUndo
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