[Rd] New generic functions in "R base" {was `truncate'}

[Gregory Warnes]

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1) What are the issues with making _existing_ functions in base into
generics?

EG, I've recently become annoyed that plot() is a generic which can be
applied to a formula:

	plot( outcome ~ predictor)

but functions like points, lowess, etc are not generic or don't have
methods defined for formulae.  I've created a points.formula() and a
generic lowess(), lowess.default(), and lowess.formula().

Are there any problems in replacing the current points() with a generic
function, provided that the default function does the same thing as the
original function?

2) I have a couple of other functions I just want to throw out:

- A generic ci()  (for confidence interval) with a method for lm and
summary.lm.   

- The function boxplot.n which gives a standard boxplot annotated with the
number of observations in each group. 

-Greg

Files are attached




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