[Rd] What do you call the value that represents a missing argument?
hadley at rice.edu
Sat Oct 9 00:32:05 CEST 2010
What's the official name for the value that represents a missing argument?
What's the correct way to create an object like this? (for example if
you are manipulating the formals of a function to add an argument with
no default value, as in http://stackoverflow.com/questions/3892580/).
as.symbol("") returns an error. Both substitute() and bquote() return
that object, but it's not obvious if this is on purpose.
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
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