Activity
From 16 Jun 2016 to 15 Jul 2016
14 Jul 2016
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20:44 CoCoALib Design #908 (Closed): Sum of ideals: what are the generators of (x) + (0)?
- The current strategy is that the generators of the sum is the concatenation of the generators of the two ideals. Is ...
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09:25 CoCoA-5 Slug #907: ApproxSolve very slow on this example
- On my old MacBook with CoCoA-5.1.5 this computation took more than 1 hour (then I stopped it).
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- While "playing" with a demo of sparse squares, I noticed that @ApproxSolve@ is strangely slow on this example (while ...
13 Jul 2016
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- We should keep copies of external libraries guaranteed compatible with cocoalib.
(also useful for compiling old ver...
07 Jul 2016
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- I had a quick look at the txt2tags website. It seems likely that a "filter" can solve the problem, but I don't know ...
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- txt2tags does not correctly handle double quotes when generating LaTeX.
The end result is that the PDF generated h...
04 Jul 2016
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- The source code for @SmallFpDoubleImpl@ includes its own impl of @InvMod@ which uses @double@ rather than an integral...
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- The function @GFanIdeals@ (was @AllReducedGroebnerBases@) has a very big output.
Usually one needs to run a function...
30 Jun 2016
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- I am still a bit perplexed by this issue.
Having @InvMod@ always throw seems to me to be the cleanest and safest s...
29 Jun 2016
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- Perhaps the best approach is not to worry about @noexcept@ at the moment since we have no experience of the feature. ...
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- If we do adopt the idea of different signatures for throwing and non-throwing versions, which approach is better:
* ... -
- I have just thought of an argument in favour of Anna's proposed design (namely, different signatures).
In C++11 ther... -
- John Abbott wrote:
> Currently the @enum ErrorActionIndicator@ is defined inside @NumTheory.H@;
May we call it @e... -
- Currently the @enum ErrorActionIndicator@ is defined inside @NumTheory.H@; probably it should be moved to @utils.H@ s...
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- I have just checked in my impl. Perhaps Anna could have a look at it, and decide whether she thinks it is comprehens...
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- John Abbott wrote:
> Your approach requires me to add 5 new signatures (for a total of 10);
good point!
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- @Anna: your approach is quite possible but it is more awkward than what I have implemented.
My approach has an opt... -
- I'd rather have (as I said in comment #10)...
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- I have implemented @enum ErrorActionIndicator { ThrowOnError, NoThrow };@
And the functions now have a 3rd arg @co...
28 Jun 2016
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- John Abbott wrote:
> Perhaps the @NoThrow@ arg as suggested in comment 9 is clearer?
clearer
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- Here is another proposal for the interface:
* @InvMod(r,m)@ throws if the inverse does not exist
* @InvMod(r,m, fla... -
- John Abbott wrote:
> Another possible interface is an optional 3rd arg to say not to throw: _e.g._ @InvMod(res,mod,N...
27 Jun 2016
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- Another possible interface is an optional 3rd arg to say not to throw: _e.g._ @InvMod(res,mod,NoThrow)@. This avoids...
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- We can indeed supply two (or more?) fns.
I like @InvMod@ as it currently is: it can be used conveniently inside a fo... -
- The documentation was already updated to say that @ERR:DivByZero@ is thrown if the inverse does not exist.
Note th... -
- Thinking about it: I would prefer to have 0 if it is relatively costly to determine if it is divisible.
We also ha... -
- The actual implementations in @NumTheory.C@ do throw rather than return 0 -- I do not know when the code was changed....
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- *@ExtensionDeg@* is certainly clearer than *@ExtnDeg@*. Right now I cannot think of any good reason to push for succ...
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- John Abbott wrote:
> I think it makes most sense to change @LogCardinality@ to @ExtnDeg@ (any other candidate names?... -
- I think it makes most sense to change *@LogCardinality@* to *@ExtnDeg@* (any other candidate names?), and then to rej...
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- John Abbott wrote:
> I'm not enthusiastic about a function for computing the cardinality.
> * As Anna recalled, the... -
- I'm not enthusiastic about a function for computing the cardinality.
* As Anna recalled, there is already *@LogCardi... -
- JAA wrote in issue #107
> JAA wonders whether *@ExtnDeg@* may not be a better name for *@LogCardinality@*. The name ... -
- We currently have the function @LogCardinality@ for a finite field.
Should we also have @cardinality@?
Should it wo... -
- done, cvs-ed.
Needs proper testing -
- Convert code from CoCoA-5
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- From existing functions in CoCoA-5
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- Convert code from CoCoA-5
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- Convert code from CoCoA-5
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- Implemented, need proper testing.
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- *2017-11*: actual setting of flags is discussed in #924
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- Implementation of @IsMaximal@ for multivariate rings now allows working non-simple extensions.
25 Jun 2016
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- In this case I think that the "backward compatibility" aspect is of relatively little importance.
If someone has use... -
- This has largely been completed; there remains only the mystery as to why @SimplestBigRatBetween@ is too slow -- this...
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- Investigations in issue #860 showed that @SimplestBigRatBetween@ was mysteriously slower than expected (and than an e...
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- I note there could be a "mild inconsistency" in the @RingTwinFloat@ implementation: let @N@ be a @BigInt@ and @x@ a t...
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- Here are the new mem fns which every ring would have to offer:
* @myIsEqual(RingElem, MachineInt)@
* @myIsEqual(Rin... -
- Here are some pros and cons:
* *(+)* avoid making temporary ring-elem values (wasteful new-delete cycle);
* *(+)* s... -
- Currently all comparisons between a @RingElem@ and a @MachineInt@ (or @BigInt@ or @BigRat@) entails first converting ...
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- I have updated the documentation for @RingTwinFloat@.
In practice the current impl of @myCmp@ deals first with the... -
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- This has been in feedback for 3 months without any reports of problems.
Apparently the (new-ish?) test @test-Ordered... -
- I have added a new test (@test-bug7.C@) for this issue.
Since there have been no problems for 3 months, I am closing... -
- I have just tried a quick experiment comparing speeds: let @N := 10^(10^9);@
* @NumDigits(N,10)@ takes less than 0....
24 Jun 2016
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- Which variants of @NumDigits@ should exist and what should they be called?
* base 10 possible name @NumDigits10@
*... -
- The GMP function is guaranteed to be fast (very fast!).
The correct definition is @NumDigits(N,base) = 1 + FloorLo... -
- @NumDigits@ is a direct call to the CoCoALib fn called @NumDigits@ which is a direct call to the GMP fn @mpz_sizeinba...
22 Jun 2016
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- Anna says it seems to work mostly OK for her (on emacs 22 or 23). She did report a problem with sending only part of...
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- I have looked on the internet for "clever" ways to make our code compatible with both C++03 and C++11 (using @auto_pt...
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- Just a quick note about doing a global replacement of @auto_ptr@ by @unique_ptr@. Open all files in emacs, then use ...
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- I have just globally replaced @auto_ptr@ with @unique_ptr@.
Just 1 line in @TmpJBMill.C@ needed to be changed to get...
21 Jun 2016
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- Apparently C++11 offers "strongly typed enum" which do not have automatic conversion to integer values.
This seems... -
- On the other hand, if we choose not to be "clever" then we can use normal (inline?) functions which always evaluate a...
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- I would like that the definitions of @and3@ and @or3@ behave just like the built-in logical operators @operator&&@ an...
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- Here are the files which use @std::auto_ptr@:
@GlobalManager.H@
@MemPool.H@
@SparsePolyRing.H@
@SugarDegree.H@
@...
20 Jun 2016
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- The function @MinPoly@ (and @MinPolyQuot@) should be straight calls to @MinPolyDef/MinPolyDefQuot@
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- The current functions should be renamed @MinPolyXXQuot(f, I, z)@
17 Jun 2016
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- A quick check we should do is to string-replace all @auto_ptr@ with @unique_ptr@ and see if the code compiles cleanly...
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- Obviously we are not the first to encounter this problem.
My understanding is that @std::unique_ptr@ is intended a... -
- Compiling CoCoALib with @--std=c++11@ produces lots of warnings about @std::auto_ptr@ being deprecated
Reportedly ... -
- We have these (for short lists)...
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- What is the difference between issues #82 and #83 (this one)?
16 Jun 2016
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- What is the status of this issue?
I'm hoping it can be closed quickly and easily for the next (imminent) release.
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- What is the answer to the original question?
Comment 1 proposed an answer, and asked for discussion. The other co... -
- As reported in issue #842 execution speed is sometimes very disappointing, so currently it may not be such a good ide...
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- We could also offer 2 functions: @InvMod@ which throws, and @InvModNoThrow@ which returns 0.
To maintain backward ... -
- I have a possible solution: I have copied @comint-get-old-input-default@ into @cocoa5.el@ then edited it so that it a...
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