slot named C

Prof Brian Ripley wrote:

On Mon, 17 Apr 2006, Paul Gilbert wrote:

Ok, but I'm surprised. I thought partial matching only happened for
named arguments. I guess I've been lucky.

Here C is named, so what did you mean?

Now I guess I've really been confused. I thought named arguments in a
function were the optional ones you named when you define the function
(with name=default, so Class is not a named argument in the call to

new). Are you saying the named arguments are the ones you name when you
call the function?

Paul

Partial matching happens for all arguments called by name, except for
those following ... in the formals.

Paul

Prof Brian Ripley wrote:

It's an error in your usage  The args of new() are

args(new)

function (Class, ...)

and what does 'C' match?  You need to name your arguments here.

On Mon, 17 Apr 2006, Paul Gilbert wrote:

"C" appears to be an illegal name for a slot in an S4 class (example
below).

It is rather an example of something which does not work.

foo <- new("testobj")
foo at C <- 2

does, for example.

If this is a known limitation, and not a bug, it would be nice
if it were caught by setClass.

Paul Gilbert

setClass("testobj", representation ( C = "numeric"))

[1] "testobj"

new("testobj", C= 2)

Error in methodsPackageMetaName("C", name) :
       'The name of the object (e.g,. a class or generic function) to
find in the meta-data' must be a single string (got an object of class
"numeric")

setClass("testobj", representation ( C. = "numeric"))

[1] "testobj"

new("testobj", C.= 2)

An object of class "testobj"
Slot "C.":
[1] 2
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