Activity
From 06 Jan 2024 to 04 Feb 2024
03 Feb 2024
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19:56 CoCoALib Bug #1361 (Closed): Compilation fails when compiling with libgsl
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18:10 CoCoALib Bug #1361: Compilation fails when compiling with libgsl
- Hi John, the new version compiles without problems.
02 Feb 2024
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- Here is a list of files which have been checked (so that we do not repeatedly check them):
* @ApproxPts2.C@
* *@END@* -
- The ctor for @homogenizer@ will create the extended polynomial ring.
What properties should this extended ring have?... -
- Following KISS, it is probably best to try the simple interface first.
If it works well, and we like it, then we can... -
- I am not yet sure of the details, but I am hoping that it can be used as in this example:...
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- Here is a suggestion for a cleaner, simpler way to effect homogenization.
The main idea is to create a new type of o... -
- Here is an example where the resulting gens could clearly be cleaned up:...
01 Feb 2024
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- Anna, are you willing to investigate point (1): the implementation behaving cleverly if the term order is wdeg-compat...
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12:10 CoCoALib Slug #1737: Homogenization of an ideal with ZZ^1-grading
- By Robbiano: No need to allow homogenization by an indet whose degree is not 1.
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- (2) I think we should *not* provide homogenization by an indet whose degree is not 1, because this is not entirely tr...
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- By Kreuzer-Robbiano: *Corollary 4.3.20*. It requires that P is positively graded.
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- @MakeSet@ is OK for CoCoA-5 and *affine points.* In CoCoALib/C++ and/or with projective points it is not so simple.
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- The CoCoA-5 manual already says that the points must be distinct (as a quick reaction to the problem reported by puw...
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- I'm more inclined to suggest @IdealOfPoints(R, MakeSet(pts))@ in the manual, if one wants to allow duplicates. Maybe...
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- Currently we allow any non-negative machine integer as the "verification level", but there is no clear semantics.
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- Could it be useful to have also *@IsHomog3@* which returns a @bool3@?
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- Source is in @SparsePolyOps-ideal.C:908@ more or less
31 Jan 2024
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- There is some non-trivial code in *@MatrixOps-IsZeroDet.C@* developed from a project in Passau...
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- Should we implement this? Or postpone it? Or reject it?
What is most natural?
Is it really a mistake to ask for... -
- I say impl the suggestion in the main description: it should be very little code, and may make some computations fast...
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- Yes, it would be possible to implement this, and perhaps not even too hard. *But why?*
When would it be useful? Is ... -
- Is this still a problem? Maybe we can ask Nico?
25 Jan 2024
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- *SUMMARY*
Offering proper thread-safety is likely trickier than I had hoped, and probably decidedly more costly at r... -
- Anna reported compilation warnings with @clang@:
@std::mutex@ cannot be copied or moved, so attempting to have defau... -
- Still to do: check other cases.
I modified only @ReadExpr(string)@ and @ReadAtom@ (for symbol).
I prefer to documen... -
- I think I improved these error messages (hard to spot in string otherwise):...
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- Here is another test case: @RingElem(R, "y(x)")@
Looks like a function call...
23 Jan 2024
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- If I recall well, a first attempt was disappointing.
One may have to be clever if many factors are small integers.
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- 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... -
- I discussed withe the OSCAR people about putting something similar into Oscar. There it seemed simpler/clearer to of...
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- Should there be just 3 @VerificationLevel@ values?
* *@low@* fast but greater chance of wrong answer
* *@high@* sl...
22 Jan 2024
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- Do you have a good use-case for this?
So far I have not needed such a function. Anyway priority is _low_.
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- What is the status of this issue?
The previous comment suggests that it should be _feedback_ or _closed_. Is there ... -
- I have cleaned the code:
* removed the InvTotient iterator which is superseded by the new code (which is fast enough... -
- Which ideal operations could benefit from @CleanGens@?
Sum, product, maybe colon. Radical?
It might make sense t... -
- Here is an outline heuristic for cleaning the generators:
* remove zeroes
* collect all monomial gens, compute GBas... -
- Anna: recover ideas, read it all, decide, implement, and close!
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- Anna: read it all, decide, implement, close!
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- Neither the manual for CoCoALib nor for CoCoA-5 mention that the generators are the mere concatenation, so we are all...
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- Anna has just confirmed that the documentation *does not guarantee* that @gens(I+J) = concat(...)@. This is good!
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- Status on 2024-01-22...
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- JAA has some new code from Passau which should be in integrated...
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21 Jan 2024
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- The "stupid approach" gets the answer in 10s (on my Linux laptop)....
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- What is the status of this issue?
Is it now resolved if one uses the updated @txt2tags@ which Nico mentioned? Which... -
- 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... -
- In comment 8 Anna says that practically all uses could be replaced by *@FirstRows(M,n)@*, so it makes a lot of sense ...
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- Hi Florian. Does compilation still fail with version 0.99818 (from website)? Thanks!
19 Jan 2024
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- JAA has revised the manual entry, and changed calls in @packages@ to @ZeroMat@
Anna will revise the defn in @Backwar... -
- Tested also for @DenseUPolyRing@ (and made example for DUP)
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- Done:...
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- John Abbott wrote:
> Does the printing change if we use @indent@? I suppose not; but could it, should it?
It is ...
16 Jan 2024
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- Not bad! Minor variant: using square brackets for lists...
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- New suggestion (the most compact I can think of)...
15 Jan 2024
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- Can we conclude this discussion, implement, and close? :-)
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- [2024-01-15] I have just confirmed that the bug is still there.
If the code is commented out with *@//@* or *@--@* ... -
- Yes, we should make @NewMat@ obsolete/backward-compatible-only.
This should be an easy change (don't forget the doc ... -
- Postponing this issue because it requires discussion, and could be tricky/lengthy if we opt to to make the change.
I... -
- 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...
13 Jan 2024
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- I have re-run the example from comment 2: it now takes 0.001s.
I'm undecided about the extra generality handling t... -
- Can we close this?
*Anna* do you agree? -
- This should be easy to implement, right?
I was wondering how often one would want to know whether an ideal is homog ...
12 Jan 2024
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- I changed this page, which may be updated only by admin, so that it just contains links to other pages.
It now refer... -
- (Just keep updating the description)
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- Links to the list of issues dealt with in each release:
*CoCoA-5*: Computer Algebra System
- (2020) *CoCoA-5.3.... -
- (Just keep updating the description)
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- Links to the list of issues dealt with in each release:
*CoCoALib: C++ library*
- (2024) *CoCoALib-0.998??* h...
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