Activity
From 03 Apr 2015 to 02 May 2015
30 Apr 2015
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10:07 CoCoALib Feature #520: Compute inverse in quotient ring (i.e. division in algebraic extn)
- Also @x/i@ is working now.
(will cvs it this afternoon) -
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29 Apr 2015
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- Polishing up all the code is always long and tedious....
Anyway!
The code is there and it works.
I still have prob... -
15:46 CoCoALib Slug #691 (In Progress): Matrix determinant over ZZ
- Hint: @DenseMatrix.C:462@ the dispatch function @DenseMatImpl::myDet@ does not handle matrices over ZZ specially -- t...
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- Just as a speed comparison reference I computed @3^(3^17)@ on both machines:
* old G4 took about 50s (on battery pow... -
- I've just tried a 1000x1000 matrix: the old G4 took about 550s, my newer MacBook Pro took 1400s. Embarrassing!
*NOT... -
- What?!? My dad's ancient iBook G4 is just as fast as my much newer MacBook Pro???
Something must be seriously wro... -
- I tried computing the following:...
24 Apr 2015
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- Let's start with just yours, for many reasons:
- it is simpler, as you said
- indeed that's also what I needed ;-)
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- We could simply have both; that way the user can choose which is more convenient (or efficient).
If we do choose t... -
- I wanted a @RandomSubset@ function which generated a random subset of @1..n@ of cardinality @r@. I was surprised whe...
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- I do find it annoying when CoCoA says that name @XYZ@ is a package-exported variable but then does not tell me which ...
23 Apr 2015
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- What exactly should the interface be?
Who does the Chinese remaindering?
Which single rational reconstructor shou... -
- Implement the algorithm for simultaneously reconstructing several rational numbers.
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- Suggested name of the new fn is @BadMFactor@; other candidates?
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- In @RatReconstructByContFrac@ the bad factor of the combined modulus is computed; make it publicly accessible
22 Apr 2015
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- I thought that it could be improved using geobuckets, so I searched the actual code performing the computation.
It i... -
- We found this slug while workig on @Implicit@ (evaluation for checking the final output can be very slow)
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- Application of PolyAlgebraHom can be unreasonably slow (this is indeed a problem in optimizing multivariate evaluation)
20 Apr 2015
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- Better names:
* *@myMoveLMToFront@*
* *@myMoveLMToBack@*
* *@myAddMulLM@*
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- John Abbott wrote:
> Mario Albert calls @myAddMul@ in a "bad" way in @TmpJBEnv.C:323@.
> From his comments it seems... -
- Renaming is done now. Isn't it?
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- As it works for me and for Anna, I'm closing the issue. The EmacsUI code really needs to be completely rewritten, bu...
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- It works for me.
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- also related to #91
19 Apr 2015
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- I ran the following test:...
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- While testing/profiling @IndetsIn@ (defined in @BuiltinOneLiners.C@) I noticed that the arg was copied by the fn, mak...
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- I am still undecided about the "return" value (and its type):
* *A* a list of integer indices (presumably of type @ve...
17 Apr 2015
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- I have impl'ed a first version (simple rather than efficient).
Not yet checked in; I want to do some testing first.
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- Mario Albert calls @myAddMul@ in a "bad" way in @TmpJBEnv.C:323@.
From his comments it seems he wants to do:... -
- I have just added a check that the first arg must be non-zero (o/w LM does not exist).
Should it be an error or a @C... -
- The mem fn @SparsePolyRingBase::myAddMul@ has strange semantics; the only documentation is a 1 line comment in the so...
16 Apr 2015
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- JAA does not much like the current approach (variable @PkgOut@).
If a package provokes an error then the screen fill... -
- Now resets error counter before reading each package (@Main.C:289@).
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- We shall need collections of @DivMask@ mirroring the elements of @myCornerList@ and @myAvoidList@. A complication ar...
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- Internally @QBGenerator@ usually makes very many divisibility tests; use @DivMask@ to make these tests faster.
Thi...
15 Apr 2015
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- Is there a @MaxExp@ function? At least one @PPMonoid@ has no upper limit on exponents; what value should be used in ...
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- Just to wake up this thread as I have modified @QBGenerator@ lately.
Does anyone actually need @myNewCorner@ list?... -
- I think I have fixed it; not entirely sure because several Emacs Lisp fns do not work the way I expected them too (or...
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- Perhaps the naive reverse search can be replaced by a call to @cocoa5-last-unended-begin@ which should be intelligent...
14 Apr 2015
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- I confirm it is just based on a trivial search for "define"
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- The following in complete code adds the wrong commented out name after doing @C-c C-e@ (calls @cocoa5-close-block@):
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- OK I can try doing the tests (sometime over the next few days).
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- I think 10000 can be replaced by @max_exp@ (how is it called in cocoalib?)
I don't think it is ever used in operation... -
- The internal representation of module in GBasis computations is through an embedding into a polynomial ring.
The ind... -
- Here are two potentially related fns:
* @InvolvesOnlyTheseIndets@ which returns a @bool@ -- could be much faster than... -
- A possible name: *@IndetsIn@*
I would like to have *IndetsIn* also for a list (which is assumed to be "homogeneous",... -
- Perhaps we will need two overflow check fns:
* @myMulOverflowCheck@
* @myMulByIndetPowerOverflowCheck@
It would ... -
- I have recently added the fn @PowerOverflowCheck@ for PPs; implemented via mem fn @myPowerOverflowCheck@. Currently ...
13 Apr 2015
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- I have just looked at some stats about @MemPool@ in one very particular example, and now wonder whether sorting the e...
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- Currently it is possible to get some stats reports from @MemPool@ objects by doing all of the following:
* @MemPoolD... -
- I wanted to get some usage stats from @MemPool@ objects; it was not as easy/helpful as I would have liked.
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- Why is the @MemPool@ object which is given to @DistrMPoly@ ignored?
MemPool logging shows that the summand pool is... -
- It seems that @DistrMPolyClean@ does not use @MemPool@ for summands even though a suitable @MemPool@ as passed as arg...
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- Not quite this topic, but very close. I made a "mistake" in a package file which produced an annoying "warning"; thi...
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- I have just tried all tests with @SmallExponent_t@ set to @unsigned char@, and @myMaxComponentIndex@ set to 100 (inst...
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- I have again encountered the problems (failing tests) with using @unsigned char@ for exponents. I wanted to use very...
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- I have implemented a first version. All tests pass. Still needs cleaning; must update doc. I'll pass prototype to ...
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- The proposed design is for each @PPMonoid@ to offer 2 fns:
* @myPower@ which just computes the power *without checkin... -
- Profiling showed that powering PPs incurred a significant time penalty in the (prototype) code for @ImplicitDirect@.
...
10 Apr 2015
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- Implemented @SparsePolyRingBase::IdealImpl::myDivMod@ for the 0-dimensional case....
09 Apr 2015
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- Note: perhaps also consider the design of C++ @std::accumulate@? Is there anything in BOOST?
My (vague) idea is t... -
- I have just written @DetDirect@ which computes the sum of many terms (one for each permutation). In order to get dec...
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- Consider creating a general "accumulator" for ring elems, a sort of generalization of a geobucket.
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