Please excuse: I did NOT intend to send this to R-Devel at this
time. I was suggesting to Jim Ramsay a question we MIGHT want to pose
to R-Devel. (I've since decided we probably won't need to.)
Spencer
On 2020-11-10 07:58, Spencer Graves wrote:
Hi, Jim:
Could you please look at svd2.Rd and see what it says? It may
give an example, where it gave a better answer than svd -- i.e., a
marginal case, where svd2 honestly gave a better answer than svd.
If we find -- either in svd2.Rd or in one of the revdepchecks --
an example where svd2 gives a demonstrably different answer, we need to
consider what to do about that.
1. Is the different answer demonstrably better? If yes,
can we fix it without LINPACK? If yes, do that. If no, we document
those concerns, send them to R-Devel <r-devel@r-project.org>, and retain
svd2 in fda and keep its use as it was. Then R-Devel can deal with the
problem however they want, and it won't affect fda -- at least not right
now.
2. Does the different answer break something in
revdepcheck because of a cosmetic problem? If yes, try to communicate
that issue with the maintainer(s) of the package(s) that would be
affected by such a change. I suggest you send them tell then that svd2
is now deprecated -- AND mark svd2.Rd with such a message -- while also
sending them code for the function(s) they call that give them an error
message, and tell them that you plan to remove svd2 from the next
release, and ask them to fix that so a revdepcheck with that new code
won't be flagged as an error. AND ask them to notify you when they have
a version on CRAN that works with your new code.
3. If the new code gives a different answer that doesn't
seem better in at least one example AND deleting svd2 doesn't break
anything in revdepcheck, then delete it.
4. If you still need to retain svd2 because of a
revdepcheck problem, I'd also document that in "cran-comments.md".
What do you think?
spencer
On 2020-11-10 07:10, James Ramsay wrote:
Hi Spencer,
One thing I’d like check with you:
I removed svd2 because CRAN indicated that LINPACK had been
deprecated. I replaced calls to svd2 with svd in geigen and CSTRfn.
This could be the issue with the two broken codes … or not. But what
is your view about using svd instead of svd2, and do you have an idea
of what to do about the LINPACK calls?
Best,
Jim
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