options(warnPartialMatchArgs=TRUE) is available to those who do regrets,
e.g.
options(warnPartialMatchArgs=TRUE)
fooA("hi",m=1)
foo.default: m is 1
Warning message:
In fooA("hi", m = 1) : partial argument match of 'm' to 'model'
On Mon, 28 Apr 2008, Peter Dalgaard wrote:
Aaron Rendahl wrote:
I'm seeing some funny behavior when using methods (the older S3 type)
and having variables that start with the same letter. I have a vague
recollection of reading something about this once but now can't seem
to find anything in the documentation. Any explanation, or a link to
the proper documentation, if it does exist, would be appreciated.
Thanks, Aaron Rendahl
University of Minnesota School of Statistics
# set up two function that both use method "foo" but with different
variable names
fooA<-function(model,...)
UseMethod("foo")
fooB<-function(Bmodel,...)
UseMethod("foo")
# now set up two methods (default and character) that have an
additional variable
foo.character <- function(model, m=5,...)
cat("foo.character: m is", m, "\n")
foo.default <- function(model, m=5,...)
cat("foo.default: m is", m, "\n")
# both of these use foo.character, as expected
fooA("hi")
fooB("hi")
# but here, fooA uses foo.default instead
fooA("hi",m=1)
fooB("hi",m=1)
# additionally, these use foo.character, as expected
fooA("hi",1)
fooA(model="hi",m=1)
This is partial matching on argument names, a feature regretted by its
designers, but a feature nevertheless.
It has nothing to do with S3 as such, it is just that fooA("hi",m=1)
matches "m" to "model" and believes that you meant fooA("hi", model=1).
It often bites people in S3 methods though, because in most other cases,
you can put the arguments after "..." where they require exact matching
(consider the naming forms of c() and cbind(), for instance).
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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--
Brian D. Ripley, [EMAIL PROTECTED]
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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