I stand corrected. It is possible for the S4 cbind to know the symbol of
unnamed arguments, by "cheating": colnames(base::cbind(...,deparse.level =
deparse.level)) -- which tells me that there ought to be a non-cheating way.
I note that the Rmpfr class union, Mnumber, means that the simple cbind(1
I truly am grateful for all the help.
I never would have thought defining a class union for objects that can be
combined with cbind, as you do in Rmpfr. That does the trick.
Is it true that the only difference in behavior between the S4 cbind and
base::cbind is that, unlike base::cbind, the S4 cb
> "DM" == Daniel Murphy
> on Sun, 4 Jul 2010 11:11:43 -0700 writes:
DM> Thank you, Professor, for drawing my attention to the nifty tracemem
DM> function. I'm using the ..1 syntax to check the properties of the S4
class
DM> at function call.
DM> The Description at ?"
Thank you, Professor, for drawing my attention to the nifty tracemem
function. I'm using the ..1 syntax to check the properties of the S4 class
at function call.
The Description at ?"cBind" tells me that I'm not alone in this predicament.
Just as Matrix needs its own cBind function, my package wil
I think you have missed the use of ..1 etc: see e.g. cBind() in
package Matrix.
So x <- attr(list(...)[[1L]], "foo") can be x <- attr(..1, "foo")
As for 'extra copying', it all depends on exactly what you are doing,
but compare
foo1 <- function(...) length(..1)
foo2 <- function(...) length(
Hi Hadley,
My actual goal is to have a cbind method in the mondate package that behaves
just like the base cbind function: class and shape of the result, names,
etc. Perhaps it's due to the fact that 'cbind' uses its own internal
dispatching, but I have not found a way to implement a "true" S3-sty
Hi Dan,
Is there a reason you can't change the function to
f <- function(x, ...) {}
?
Hadley
On Fri, Jul 2, 2010 at 4:26 PM, Daniel Murphy wrote:
> R-Devel:
>
> I am trying to get an attribute of the first argument in a call to a
> function whose formal arguments consist of dots only and do s
Hi Daniel,
On 02.07.2010, at 23:26, Daniel Murphy wrote:
> I am trying to get an attribute of the first argument in a call to a
> function whose formal arguments consist of dots only and do something, e.g.,
> call 'cbind', based on the attribute
> f<- function(...) {get first attribute; maybe or m
Hi Daniel,
On 02.07.2010, at 23:26, Daniel Murphy wrote:
> I am trying to get an attribute of the first argument in a call to a
> function whose formal arguments consist of dots only and do something, e.g.,
> call 'cbind', based on the attribute
> f<- function(...) {get first attribute; maybe or m
R-Devel:
I am trying to get an attribute of the first argument in a call to a
function whose formal arguments consist of dots only and do something, e.g.,
call 'cbind', based on the attribute
f<- function(...) {get first attribute; maybe or maybe not call 'cbind'}
I thought of (ignoring "deparse.
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