>>>>> Suharto Anggono Suharto Anggono
>>>>> on Wed, 4 Mar 2026 06:05:18 +0000 (UTC) writes:
> Then, please announce the change in NEWS. For example:
> The result of arithmetic and comparison operations of non-overlapping
"ts" objects where either is a matrix is now a matrix.
> It seems that the statement "diff(<ts-matrix>) remains
matrix, even when it has length zero" was meant for the change to
'Ops.ts'. But the wording is about diff(<ts-matrix>), which is
included in the previous statement.
> But I've just realized this.
> Suppose that
> x <- ts(0)
> With the change, x - lag(x, -1) and x == lag(x, -1) are NULL.
> In R 4.5.2, x - lag(x, -1) is integer(0) and x == lag(x, -1) is
logical(0).
Indeed, so we may even have to change R-devel further (for this
rare boundary case).
But the R 4.5.2 x - lag(x, -1) giving integer(0) is only somewhat better
than
giving NULL when in principle the "truly correct" answer should
be double(0) and we'd rather get that right in R-devel.
Re NEWS, you are right: I will add a small note, indeed {as it
is not "code" that's frozen}.
Martin
> ________
> On Tuesday, 3 March 2026 at 04:02:14 pm GMT+7, Martin Maechler
<maechler at stat.math.ethz.ch> wrote:
>>>>> Peter Dalgaard
>>>>>> ? ? on Mon, 2 Mar 2026 14:37:22 +0100 writes:
> ? ? > I do hope Martin sees this. Code freeze for 4.5.3 is
> ? ? > Wednesday @0:02 ...? - Peter
> Yes, I did see and think about it, but decided that it was "too
> late" now, *and* not a "problem" I think:
> `-` now exhibits the correct behaviour? but the diff()
> ? ? methods do not yet (but do in R-devel etc).
> Martin
> ? ? >> On 28 Feb 2026, at 12.57, Suharto Anggono Suharto Anggono
> ? ? >> via R-devel <r-devel at r-project.org> wrote:
> ? ? >>
> ? ? >> Now that the NEWS item is gone from "CHANGES IN R
4.5.2
> ? ? >> patched", please also revert the change to
'Ops.ts' in
> ? ? >> R-4-5-branch, as I have mentioned. In R-4-5-branch, the
> ? ? >> change makes diff(m) inconsistent with m - lag(m, -1) for
> ? ? >> 1-row ts matrix m. Previously, neither of them was a
> ? ? >> matrix.
> ? ? >>
> ? ? >> _______ On Monday, 23 February 2026 at 07:16:36 pm GMT+7,
> ? ? >> Martin Maechler <maechler at stat.math.ethz.ch>
wrote:
> ? ? >>
> ? ? >>
> ? ? >>>>>>> Suharto Anggono Suharto Anggono via
R-devel on Sun,
> ? ? >>>>>>> 22 Feb 2026 03:58:13 +0000 (UTC)
writes:
> ? ? >>
> ? ? >> > diff(m, lag, dif) for matrix m now still returns >
> ? ? >> matrices, also when lag * dif > nrow(m) (PR#18972,
thanks
> ? ? >> to > Mikael Jagan and Suharto Anggono).? >
> ? ? >> diff(<ts-matrix>) remains matrix, even when it has
length
> ? ? >> zero.
> ? ? >>
> ? ? >> > The above NEWS item has been moved to "CHANGES
IN R
> ? ? >> 4.5.2 patched".
> ? ? >>
> ? ? >> > In fact, in R-4-5-branch, diff(m, lag, dif) for
matrix
> ? ? >> m is still not a matrix when lag * dif > nrow(m) (see
> ? ? >>
https://svn.r-project.org/R/branches/R-4-5-branch/src/library/base/R/diff.R
> ? ? >> for 'diff.default';
> ? ? >>
https://svn.r-project.org/R/branches/R-4-5-branch/src/library/base/R/datetime.R
> ? ? >> for 'diff.POSIXt';
> ? ? >>
https://svn.r-project.org/R/branches/R-4-5-branch/src/library/base/R/dates.R
> ? ? >> for 'diff.Date';
> ? ? >>
https://svn.r-project.org/R/branches/R-4-5-branch/src/library/stats/R/ts.R
> ? ? >> for 'diff.ts').
> ? ? >>
> ? ? >> > And I suggest keeping it so. Because it has been like
> ? ? >> that simce the beginning, I think changing it in a patch
> ? ? >> release is not appropriate.
> ? ? >>
> ? ? >> We have ported bug fixes of "forever bugs" to
the "R
> ? ? >> patched branch", before, quite on purpose.? Typically
> ? ? >> they have been really rare use cases and for that reason
> ? ? >> probably were not detected and reported earlier... and we
> ? ? >> (R core) still thought these bugs should disappear as
> ? ? >> quickly as possible.
> ? ? >>
> ? ? >> For the above reason(s), I *had* actually planned to port
> ? ? >> this bug fix also to R "4.5.2 patched" ...? But
then it
> ? ? >> has become somewhat late to do the port only now, and R
> ? ? >> 4.5.3 will only be a "wrap up" release anyway..
> ? ? >>
> ? ? >> Hence, I agree with your opinion and will now move the
> ? ? >> NEWS entry instead of porting the bug fix which was the
> ? ? >> original plan.
> ? ? >>
> ? ? >> Martin
> ? ? >>
> ? ? >>
> ? ? >> > What have been ported to R-4-5-branch are just-
> ? ? >> replacing 'tsLag' with 'lag' in
'diff.ts'- 'Ops.ts' to
> ? ? >> return matrix when e1 or e2 is matrix but e1 and e2 are
> ? ? >> not overlapping > I suggest reverting the port. A
> ? ? >> justification of diff(m) for 1-row ts matrix m not being
> ? ? >> a matrix was that m - lag(m, -1) was not a matrix.? >
> ? ? >> Replacing 'tsLag' with 'lag' in
'diff.ts' is actually OK,
> ? ? >> but not necessary.
> ? ? >>
> ? ? >> [[alternative HTML version deleted]]
> ? ? >>
> ? ? >> ______________________________________________
> ? ? >> R-devel at r-project.org mailing list
> ? ? >> https://stat.ethz.ch/mailman/listinfo/r-devel
> ? ? > --
> ? ? > Peter Dalgaard, Professor, Center for Statistics,
> ? ? > Copenhagen Business School Solbjerg Plads 3, 2000
> ? ? > Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23
> ? ? > Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
> [[alternative HTML version deleted]]