Activity
From 28 Mar 2016 to 26 Apr 2016
26 Apr 2016
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19:05 Feature #872 (In Progress): LinSolve for matrices over FFp
- Currently CoCoALib uses generic code for solving linear systems over small finite fields.
Implement some special c... -
- Review the design of ideals.
Some points to bear in mind:
* an ideal should probably be immutable -- any operatio...
22 Apr 2016
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18:09 Slug #866: implicit, ImplicitHypersurface: improve output verification
- I checked in @IsZeroEvalHorner@ in case you want to play with it.
The call is currently commented out. Just look fo... -
- Anna Maria Bigatti wrote:
> > But I'd like another try: I'm planning to try to implement a sort of recursive Horner.... -
- I seem to recall vaguely seeing a paper by Mourrain (or someone in his group) possibly about this. I think the quest...
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- Anna Maria Bigatti wrote:
> But I'd like another try: I'm planning to try to implement a sort of recursive Horner. M... -
- I would like to use @unsigned short@ to store @SmallFp@ values, but still have a decent range _i.e._ without the rest...
19 Apr 2016
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- Perhaps I should have read the @configure@ script better: I have already inserted (ages ago) a warning for versions o...
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- John Abbott wrote:
> Mario suggested that we could modify the CoCoALib configuration script to check that GMP is at ... -
- Mario suggested that we could modify the CoCoALib configuration script to check that GMP is at least version 5.0.0; c...
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- Mario has found a web page which explains that the preprocessor flag @__cpluscplus@ has a numerical value indicating ...
18 Apr 2016
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- John Abbott wrote:
> I suggest adding a probabilistic check of correctness: use the parametric formulas to generate ... -
- I suggest adding a probabilistic check of correctness: use the parametric formulas to generate a random (numerical) p...
13 Apr 2016
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- John Abbott wrote:
> The example below takes about 12s on my computer, but only about 0.25s if the coeff field is @Z... -
- The example below takes about 12s on my computer, but only about 0.25s if the coeff field is @ZZ/(32003)@. Why is it...
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- The current impl of @SliceCoreQQ@ is simple rather than efficient.
It uses modular+CRT to build the answer.
Current... -
- Thanks to Anna (grrrr!) you can build CoCoALib (and CoCoA-5) with an uninstalled version of GMP, _i.e._ a "private" v...
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15:23 Bug #867 (Closed): Compilation Error: C++11 and old GMP-Version
- I tried to compile CoCoALib at our LinuxCluster with a pretty old GMP version (4.3.1) and C++11 activated (with addit...
07 Apr 2016
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- I have commented out the parts which disable the default assignment. Everything compiled fine, and all tests passed....
06 Apr 2016
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- Since assignment is allowed for @ring@ (and presumably causes no trouble), I see no reason for blocking it for "speci...
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- In issue #244 we approved the activation of assignment for objects of type @ring@.
Mario has pointed out that assign...
05 Apr 2016
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- One possible explanation for @ContFracIter@ being so slow is that its implementation is "very clean" (_e.g._ it uses ...
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- I have just tried another timing test with a list of about 90000 copies of @fibonacci(400)/fibonacci(401)@ mapped int...
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- I have just tried a speed test with more complicated rationals (all of the form @p1/p2@ where @p1@ and @p2@ are disti...
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- I have implemented a variant of @myIsRational@ which uses @SimplestBigRatBetween@. The implementation is certainly m...
04 Apr 2016
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- I have just read through the code for @RingTwinFloatImpl::myIsRational@ and it looks OK to me.
The only dodgy aspe...
31 Mar 2016
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- JAA tried compiling on a recent Linux box (with recent gcc, version 5.3.1) explicitly setting the flag @-std=c++11@. ...
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- Some notes about Bruns's platform:...
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- Bruns reported the following errors during compilation:...
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- Bruns has reported compilation errors in the Janet Basis code (files called @TmpJB...@) when compiling with the flag ...
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- Mario has downloaded the GINV source, but has had several problems with compilation -- he has not yet succeeded in co...
30 Mar 2016
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- Since the old impl of @RingTwinFloat::myIsInteger@ simply called @myIsRational@ and then checked that the denominator...
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- I have added a new "boolean" data member saying whether *@myIsEqualNZIgnoreSign@* should allow the outer intervals to...
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- One unfortunate aspect of the mem fn @myCmp5@ is who throws @InsuffPrec@ when a comparison operator needs to throw?
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- With the impl I have in mind for @op>=@ and @op<=@ via @myCmp5@, it is not possible to have values @X@ and @Y@ such t...
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- I have cleaned the impl considerably; it is now obviously correct (but possibly slower than necessary as a wasteful t...
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- I am now happy with the impls; they are simple enough that they are "obviously correct" (I hope!). Also I believe th...
29 Mar 2016
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- The idea of changing @operator>=@ and @operator<=@ is trickier than I had originally thought (or hoped) because they ...
28 Mar 2016
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- Perhaps I could implement both approaches and let the user choose. If so, should it be a compile-time switch or a ru...
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- I am still unsure whether it is reasonable for a test such as @Y <= X@ to give @true@ when @Y = X@ throws @InsuffPrec...
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- *Variant A* is notionally quite simple; I think I prefer it to the other possibilities. I can try implementing it (i...
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- A simpler idea would be to modify when comparisons throw @InsuffPrec@.
The model I have in mind is a fixed (non-ze... -
- If we want to keep the behaviour of the comparison functions unchanged (esp. regarding when to throw @InsuffPrec@) th...
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- The critical step is comparing two twin-floats for equality. If the two values are quite different then it is easy t...
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- Consider the following code excerpt:...
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- I have some philosophical questions about comparisons between twin-floats.
For the equality test there are 3 possi...
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