CoCoA Project

03 Feb 2024

19:56 CoCoALib Bug #1361 (Closed): Compilation fails when compiling with libgsl

John Abbott

02 Feb 2024

20:34 CoCoALib Bug #1764: Verbosity messages: avoid printing BIG values

Here is a list of files which have been checked (so that we do not repeatedly check them):
* @ApproxPts2.C@
* *@END@* John Abbott

20:21 CoCoALib Feature #1778: Homogenizer

The ctor for @homogenizer@ will create the extended polynomial ring.
What properties should this extended ring have?... John Abbott

20:13 CoCoALib Feature #1778: Homogenizer

Following KISS, it is probably best to try the simple interface first.
If it works well, and we like it, then we can... John Abbott

20:10 CoCoALib Feature #1778: Homogenizer

I am not yet sure of the details, but I am hoping that it can be used as in this example:... John Abbott

20:04 CoCoALib Feature #1778 (In Progress): Homogenizer

Here is a suggestion for a cleaner, simpler way to effect homogenization.
The main idea is to create a new type of o... John Abbott

20:01 CoCoALib Design #1647: Suppress zero from ideal generators? Detect 1 and simplify generators?

Here is an example where the resulting gens could clearly be cleaned up:... John Abbott

01 Feb 2024

19:59 CoCoALib Slug #1737: Homogenization of an ideal with ZZ^1-grading

Anna, are you willing to investigate point (1): the implementation behaving cleverly if the term order is wdeg-compat... John Abbott

10:42 CoCoALib Design #1750: IdealOfPoints: allow duplicate points?

@MakeSet@ is OK for CoCoA-5 and *affine points.* In CoCoALib/C++ and/or with projective points it is not so simple.
... John Abbott

10:17 CoCoALib Design #1750: IdealOfPoints: allow duplicate points?

The CoCoA-5 manual already says that the points must be distinct (as a quick reaction to the problem reported by puw... John Abbott

10:03 CoCoALib Design #1777: VerificationLevel: just 3? Low, high, guaranteed?

Currently we allow any non-negative machine integer as the "verification level", but there is no clear semantics.
John Abbott

09:50 CoCoALib Slug #1739: IsHomog for ideals

Could it be useful to have also *@IsHomog3@* which returns a @bool3@?
John Abbott

09:47 CoCoALib Slug #1739: IsHomog for ideals

Source is in @SparsePolyOps-ideal.C:908@ more or less John Abbott

31 Jan 2024

22:26 CoCoALib Feature #1197: IsZeroDet: new fn

There is some non-trivial code in *@MatrixOps-IsZeroDet.C@* developed from a project in Passau... John Abbott

22:16 CoCoALib Design #1750: IdealOfPoints: allow duplicate points?

Should we implement this? Or postpone it? Or reject it?
What is most natural?
Is it really a mistake to ask for... John Abbott

22:14 CoCoALib Slug #1739 (In Progress): IsHomog for ideals

I say impl the suggestion in the main description: it should be very little code, and may make some computations fast... John Abbott

22:07 CoCoALib Slug #1737 (In Progress): Homogenization of an ideal with ZZ^1-grading

Yes, it would be possible to implement this, and perhaps not even too hard. *But why?*
When would it be useful? Is ... John Abbott

22:02 CoCoALib Support #1665: Compilation on Windows: problems for normaliz

Is this still a problem? Maybe we can ask Nico?
John Abbott

25 Jan 2024

20:27 CoCoALib Design #1703 (Resolved): Threadsafety, multithreading: optional fn arg (or separate fn)

*SUMMARY*
Offering proper thread-safety is likely trickier than I had hoped, and probably decidedly more costly at r... John Abbott

20:22 CoCoALib Design #1703: Threadsafety, multithreading: optional fn arg (or separate fn)

Anna reported compilation warnings with @clang@:
@std::mutex@ cannot be copied or moved, so attempting to have defau... John Abbott

10:12 CoCoALib Bug #1579: Readexpr/RingElem: unhelpful error message when input is wrong

Here is another test case: @RingElem(R, "y(x)")@
Looks like a function call...
John Abbott

23 Jan 2024

22:14 CoCoALib Feature #1715: ProductBigInt (also ProductBigRat???)

If I recall well, a first attempt was disappointing.
One may have to be clever if many factors are small integers.
John Abbott

22:13 CoCoALib Feature #947: IsRadical for ideal?

I think my idea might not work in general.
Let @I := ideal(x+y^2)@ then @I@ *is* radical. But if I add an extra ge... John Abbott

09:27 CoCoALib Design #1777: VerificationLevel: just 3? Low, high, guaranteed?

I discussed withe the OSCAR people about putting something similar into Oscar. There it seemed simpler/clearer to of... John Abbott

09:25 CoCoALib Design #1777 (New): VerificationLevel: just 3? Low, high, guaranteed?

Should there be just 3 @VerificationLevel@ values?
* *@low@* fast but greater chance of wrong answer
* *@high@* sl... John Abbott

22 Jan 2024

20:28 CoCoALib Feature #539: Functions to clean up a factorization

Do you have a good use-case for this?
So far I have not needed such a function. Anyway priority is _low_.
John Abbott

20:24 CoCoALib Feature #1349 (In Progress): ideal ctor where given gens are a gbasis

What is the status of this issue?
The previous comment suggests that it should be _feedback_ or _closed_. Is there ... John Abbott

20:14 CoCoALib Design #1753 (Feedback): Clean up EulerTotient, InvTotient jungle in NumTheory-misc

I have cleaned the code:
* removed the InvTotient iterator which is superseded by the new code (which is fast enough... John Abbott

19:41 CoCoALib Design #1647: Suppress zero from ideal generators? Detect 1 and simplify generators?

Which ideal operations could benefit from @CleanGens@?
Sum, product, maybe colon. Radical?
It might make sense t... John Abbott

19:39 CoCoALib Design #1647: Suppress zero from ideal generators? Detect 1 and simplify generators?

Here is an outline heuristic for cleaning the generators:
* remove zeroes
* collect all monomial gens, compute GBas... John Abbott

10:47 CoCoALib Design #908: Sum of ideals: what are the generators of (x) + (0)?

Anna has just confirmed that the documentation *does not guarantee* that @gens(I+J) = concat(...)@. This is good!
John Abbott

10:44 CoCoALib Design #908: Sum of ideals: what are the generators of (x) + (0)?

Status on 2024-01-22... John Abbott

10:37 CoCoA-5 Feature #368: port SmithNormalForm (CoCoA-4)package to CoCoA-5

JAA has some new code from Passau which should be in integrated...
John Abbott

10:36 CoCoALib Design #1768 (Closed): Limit indentation in verbose mesgs?

John Abbott

21 Jan 2024

20:33 CoCoALib Slug #1569 (In Progress): IsInRadical too slow (test-RadicalMembership)

The "stupid approach" gets the answer in 10s (on my Linux laptop).... John Abbott

20:21 CoCoALib Bug #1662: txt2tags: problem with filenames containing "_" or "-"

What is the status of this issue?
Is it now resolved if one uses the updated @txt2tags@ which Nico mentioned? Which... John Abbott

20:16 CoCoALib Bug #1579: Readexpr/RingElem: unhelpful error message when input is wrong

I have added a new error mesg for the case that the first extra char is open-bracket or letter or digit.
The err mes... John Abbott

20:01 CoCoALib Design #64: submat takes only vector<long>

In comment 8 Anna says that practically all uses could be replaced by *@FirstRows(M,n)@*, so it makes a lot of sense ... John Abbott

19:46 CoCoALib Bug #1361: Compilation fails when compiling with libgsl

Hi Florian. Does compilation still fail with version 0.99818 (from website)? Thanks! John Abbott

19 Jan 2024

18:11 CoCoA-5 Design #1626 (Feedback): NewMat: should be obsolescent?

JAA has revised the manual entry, and changed calls in @packages@ to @ZeroMat@
Anna will revise the defn in @Backwar... John Abbott

16 Jan 2024

19:07 CoCoA-5 Bug #1623: EmacsUI: annoying colours

Not bad! Minor variant: using square brackets for lists... John Abbott

15 Jan 2024

19:54 CoCoA-5 Bug #1623: EmacsUI: annoying colours

Can we conclude this discussion, implement, and close? :-) John Abbott

19:49 CoCoA-5 Bug #469: Emacs UI: keywords in multiline comments

[2024-01-15] I have just confirmed that the bug is still there.
If the code is commented out with *@//@* or *@--@* ... John Abbott

19:42 CoCoA-5 Design #1626: NewMat: should be obsolescent?

Yes, we should make @NewMat@ obsolete/backward-compatible-only.
This should be an easy change (don't forget the doc ... John Abbott

19:39 CoCoA-5 Feature #1541: foreach with ref to list entry?

Postponing this issue because it requires discussion, and could be tricky/lengthy if we opt to to make the change.
I... John Abbott

19:32 CoCoA-5 Slug #1363 (In Progress): Emacs UI: slow with long lines

I did take a look at @so-long.el@, and it did help a bit.
Handling of long lines is a known emacs weakness; probably... John Abbott

13 Jan 2024

22:27 CoCoALib Slug #1756: deg(f) is slow if f is long

I have re-run the example from comment 2: it now takes 0.001s.
I'm undecided about the extra generality handling t... John Abbott

22:20 CoCoALib Design #1768: Limit indentation in verbose mesgs?

Can we close this?
*Anna* do you agree? John Abbott

22:16 CoCoALib Slug #1739: IsHomog for ideals

This should be easy to implement, right?
I was wondering how often one would want to know whether an ideal is homog ... John Abbott