On Thu, 9 Dec 2021 15:47:02 +0100
Martin Maechler wrote:
> What you should take from there:
> Do work with *both*
> missing(drop)
> and
> nargs()
>
> (and more)
> in order to distinguish m[i] from m[i,] etc
Thanks for the advice! `[<-.data.frame` does make for enlightening
reading.
> Ivan Krylov
> on Wed, 8 Dec 2021 16:52:00 +0300 writes:
I have always learnt a lot about programming when reading other
people's code .. notably if those people new what they are
doing.
In this case, studying R-core's
`[.data.frame` and
`[<-.data.frame`
{or for S4 methods, the
I haven't followed this thread, so this may be stupid, but have you
looked at the do.call(`[`,...) idiom? Something like:
x <- array(1:8, c(2,2,2))
> x
, , 1
[,1] [,2]
[1,]13
[2,]24
, , 2
[,1] [,2]
[1,]57
[2,]68
> l <- as.list(rep(TRUE, 2))
>
Got some progress on this, but still not sure how to continue. First, a
much more simple script reproducing the behaviour that confuses me:
foo <- function(x, ...) structure(x, class = 'foo')
`[.foo` <- function(x, i, ..., drop = TRUE) {
print(sys.call())
print(match.call())
On Thu, 02 Dec 2021 13:41:52 -0800
Jeff Newmiller wrote:
> I think you need a reprex... I don't think your claim is correct as
> stated.
Sorry, let me try again. The following "works" for me in the sense of
throwing the same error on R 3.3 and R-devel:
foo <- function(x, ...) UseMethod('foo')
I think you need a reprex... I don't think your claim is correct as stated.
On December 2, 2021 1:00:01 PM PST, Ivan Krylov wrote:
>Sorry for sending an unfinished message!
>
>On Thu, 2 Dec 2021 23:57:11 +0300
>Ivan Krylov wrote:
>
>> Why can I forward missing i,j to built-in `[`
>
>Why can I
Hi everyone,
Suppose I've got a class 'foo' that's a matrix tagged with a vector of
length() == nrow(foo):
foo <- function(x, ...) UseMethod('foo')
foo.matrix <- function(x, y, ...) {
stopifnot(
!is.recursive(y),
length(y) == nrow(x),
Sorry for sending an unfinished message!
On Thu, 2 Dec 2021 23:57:11 +0300
Ivan Krylov wrote:
> Why can I forward missing i,j to built-in `[`
Why can I forward missing i,j to the built-in `[` method but not
to user-defined methods? How can I fix this? Default i and j to TRUE?
Are there less
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