On Thu, 9 Dec 2021 15:47:02 +0100
Martin Maechler <maech...@stat.math.ethz.ch> 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.
I've also considered editing the call, like lm() does:
`[<-.foo` <- function(x, i, ..., value) {
cl <- match.call(expand.dots = FALSE)
cl[[1L]] <- quote(`[`)
cl$value <- NULL
x.subset <- eval(cl, parent.frame())
# ... checks on x.subset ...
NextMethod()
}
...but that fails _some_ of my tests (but not others) with "object
`*tmp*` not found"). Non-standard evaluation is probably not the answer
here. I'll have to handle the forms of the call with different nargs()
manually and separately.
--
Best regards,
Ivan
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