[Rd] No is.formula()

[Warnes, Gregory R]

There appears to be no "is.formula()" function in R-1.9.1.  May I suggest
that

	is.formula <- function(x) inherits(x, "formula")

be added to base, since formula is a fundimental R type?

Gregory R. Warnes
Manager, Non-Clinical Statistics
Pfizer Global Research and Development



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