[Rd] Wrong move of NEWS item

[Peter Dalgaard]

I do hope Martin sees this. Code freeze for 4.5.3 is Wednesday @0:02 ...
 
- Peter

 
> On 28 Feb 2026, at 12.57, Suharto Anggono Suharto Anggono via R-devel <r-devel using 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 using 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]]
> 
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-- 
Peter Dalgaard, Professor,
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