[R] Does a formula object have a "left hand side"

Erik Iverson eriki at ccbr.umn.edu
Mon Dec 13 21:17:21 CET 2010


Does anyone know of a function that will determine whether
or not a formula object has a left hand side?

I.e., can differentiate between

y ~ x + z


~ x + z

Perhaps I'm overlooking the obvious...


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