[Rd] Re: [R] Several R vs S-Plus issues
Kurt Hornik
Kurt.Hornik@ci.tuwien.ac.at
Thu, 4 Oct 2001 10:13:54 +0200
>>>>> David Brahm writes:
> ...
> OK, so here's what I think I've learned. Feedback please if I've
> still got it wrong.
> 1) Do not Cc: to r-bugs!!!
> 2) Bugs go individually to r-bugs. Here is the only one I think qualifies:
> - myfun <- function(x, ...) {x[...] <- 0; x} fails if no ... given
> 3) Feature and compatibility requests go to r-devel, to which I am just now
> subscribed. Separate messages, I suppose. These would be:
> - LETTERS[c(NA,2)] in S is c("","B"), but in R is c("NA","B")
I think we do not want to change this.
Splus has
> (1:2)[c(NA,2)]
[1] NA 2
> is.na((1:2)[c(NA,2)])
[1] T F
> is.na(c(TRUE, FALSE)[c(NA,2)])
[1] T F
etc, so I think the logic would be that we get NA whenever we subscript
by NA. The current Splus behavior for character vectors is different,
and I do not see why it should. Note that in R,
R> is.na(LETTERS[c(NA,2)])
[1] TRUE FALSE
so we really have NA but it is printed as "NA" (and this might be
another case where <NA> would be better).
> - system() has no "input" argument in R
> - No slice.index()
> - No rowSums(), colSums(), colVars(), etc.
Doug Bates had raised this issue some time ago. In the interest of
keeping the S language core as small as possible, I'd rather recommend
against adding these. We can basically do that same using apply(), and
if the point is to have fast C code I think we should rather
special-case apply accordingly.
> - No unpaste()
This is a function from the chron package, and it is also available in
the R version of chron. Again, I am not sure whether this should be in
the S language core: we have strsplit.
-k
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