[Rd] No is.formula()

[A.J. Rossini]

"Warnes, Gregory R" <gregory_r_warnes at groton.pfizer.com> writes:

> 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?

why not just 

    is(x,"formula") 

?

best,
-tony

-- 
Anthony Rossini			    Research Associate Professor
rossini at u.washington.edu            http://www.analytics.washington.edu/ 
Biomedical and Health Informatics   University of Washington
Biostatistics, SCHARP/HVTN          Fred Hutchinson Cancer Research Center
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