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Gregory Warnes

2001-May-23 18:37 UTC

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

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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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Peter Dalgaard BSA

2001-May-23 19:12 UTC

head link

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

Gregory Warnes <warnes@ci.tuwien.ac.at> writes:
> 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?
Ummm, points.formula has been in base R since february 2000... slipped
in between 0.99.0 and 1.0.0 apparently.

Also note that loess() (with the correct spelling, in the modreg
library) does have a formula interface.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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Prof Brian Ripley

2001-May-23 19:33 UTC

head link

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

On Wed, 23 May 2001, Gregory Warnes wrote:
> 1) What are the issues with making _existing_ functions in base into
> generics?
There are some performance issues (not necessarily relevant here). Last
time I looked hard at this method dispatch was taking ca 0.2 secs (not on
my fastest machines ....), and some generics turn up rather high on
profiling list rather often.

The other issue I see is the argument list for the generic, given that
all method ought to agree with the generic (at least aesthetically).

[...]

-- 
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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kjetil halvorsen

2001-May-23 19:39 UTC

head link

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

Gregory Warnes wrote:> 
> 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().
lowess is supposed to handle formulas and will do so when the 
scope error in xy.coords is corrected.

Kjetil Halvorsen
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