[Rd] number of parameters of a function.
Prof Brian D Ripley
ripley@stats.ox.ac.uk
Tue, 25 Jul 2000 12:22:48 +0100 (BST)
On Tue, 25 Jul 2000, Duncan Temple Lang wrote:
>
> Is there a way to programmatically determine how many arguments a function
> accepts? In S, one can compute this as
> length(theFunction) - 1
> and determine the parameter names as
> names(theFunction)
> due to the representation of functions.
length(formals(theFunction))
Something similar works in S-PLUS 5.x:
length(functionArgs(theFunction))
as I guess Duncan knows.
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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