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From 12 May 2015 to 10 Jun 2015

10 Jun 2015

17:12 Feature #728: Noncommutative algebra "of solvable type"
For starters Ore algebra as a simple case of polynomial algebras of solvable type should be enough. Their main advant... Werner M Seiler
12:55 Feature #728: Noncommutative algebra "of solvable type"
I made a slight mistake in the original description. It should have been:
* @x[i]*x[j] = q*x[j]*x[i] + tail@ where @...
John Abbott
14:24 Slug #725: Example database: Slow ideal equality test
John Abbott wrote:
> In the specific example of this issue there are 36 indets (all used), 15 polynomials, and @dim(...
Anna Maria Bigatti
13:41 Feature #386 (In Progress): add resolution data type
Mario and I have discussed some possible designs; neither of us has much experience with resolutions, so it is possib... John Abbott
13:19 Feature #729 (In Progress): Betti numbers, betti diagram
Mario suggested that the internal representation should be @vector< map<degree, long> >@.
The resolution is a list...
John Abbott
11:30 Feature #730: Stats in GBMill (GReductor)
I suppose Mario ought to write about this. He has followed my design suggestion, and seems to be happy with it. If ... John Abbott
11:24 Feature #730: Stats in GBMill (GReductor)
Mario asked about gathering stats for his involutive basis code.
I suggested using a @struct@ to keep all the stats ...
John Abbott
11:18 Feature #730 (Closed): Stats in GBMill (GReductor)
There is already some implementation for gathering stats in G-basis computation.
Review it!
Perhaps separate st...
John Abbott

08 Jun 2015

22:27 Feature #728: Noncommutative algebra "of solvable type"
Sounds like a generalisation of RingWeyl.
... Werner, are you willing to test it out? ;-)
I was thinking of porti...
Anna Maria Bigatti
18:45 Feature #728 (In Progress): Noncommutative algebra "of solvable type"
Werner asked about the possibility of having non-commutative algebras of solvable type. They are nice enough that Bu... John Abbott
18:52 Feature #729: Betti numbers, betti diagram
Mario points out that for a non-graded case we will also need a datastructure.
*UPDATE* (20150608) Mario thinks it is...
John Abbott
18:50 Feature #729 (In Progress): Betti numbers, betti diagram
Design a good data structure for storing Betti numbers (also for multigraded case).
John Abbott
11:09 Feature #718: Insert calls to CheckForInterrupt
Mario asked about the possible run-time cost of calling @CheckForInterrupt@.
Currently it may be needlessly expensiv...
John Abbott

07 Jun 2015

12:46 Slug #725: Example database: Slow ideal equality test
In the specific example of this issue there are 36 indets (all used), 15 polynomials, and @dim(P/I)@ gives 21. Isn't... John Abbott

06 Jun 2015

22:49 Slug #725: Example database: Slow ideal equality test
For completeness here is the list of generators in @QQ[x[1..6,1..6]]@ ... John Abbott
22:46 Slug #725: Example database: Slow ideal equality test
Anna, you are right (in principle). In practice, I think almost the whole time is spent computing a G-basis (rather ... John Abbott
21:17 Slug #725: Example database: Slow ideal equality test
Instead of checking equality you should just check whether g_j is in the ideal generated by the others. However, thi... Anna Maria Bigatti
20:32 Slug #725: Example database: Slow ideal equality test
It has finally finished:... John Abbott
14:25 Slug #725: Example database: Slow ideal equality test
Progress...... John Abbott
13:19 Slug #725: Example database: Slow ideal equality test
Re-running the program (over @QQ@) I get the following output (still incomplete):... John Abbott
13:14 Slug #725 (New): Example database: Slow ideal equality test
This is probably not important, but I wanted to record this example which seems to be unexpectedly slow -- it might b... John Abbott

01 Jun 2015

22:31 Slug #722 (In Progress): valuation slow for large inputs
I have implemented a version which divides repreatedly by the largest power of the prime which fits into @unsigned lo... John Abbott
10:39 Slug #722: valuation slow for large inputs
Probably @QuoRem@ is a more sensible choice than @gcd@.
John Abbott

31 May 2015

11:58 Slug #722: valuation slow for large inputs
Source code is in @NumTheory.C@.
It is just a very simple loop. Presumably I could test divisibility by a small pow...
John Abbott
11:56 Slug #722 (Closed): valuation slow for large inputs
I tried @valuation(5,factorial(1000000))@ and it took too long.
Make @valuation@ faster if the prime is small (and...
John Abbott

30 May 2015

14:52 Feature #721: CheckForInterrupt: string arg to specify where it was called?
I have implemented my suggestion in note 1.
It occurred to me that if we do allow a string as arg (to where @Check...
John Abbott
10:01 Feature #721 (In Progress): CheckForInterrupt: string arg to specify where it was called?
I prefer that the exception thrown is not of the same type as a normal @CoCoA_ERROR@ because the reasons behind the e... John Abbott
10:22 Feature #385: Design new errors using inheritance
I think it may be a cleaner design to use (impose) the convention that all exceptions CoCoALib are derived from a sin... John Abbott

29 May 2015

17:20 Feature #721: CheckForInterrupt: string arg to specify where it was called?
In fact I was suggesting something else: @CheckInterrupt@ throws something which is not a CoCoA_ERROR, so cocoa-5 doe... Anna Maria Bigatti
16:19 Feature #721: CheckForInterrupt: string arg to specify where it was called?
It looks to be almost trivial to add @CheckForInterrupt(const char*)@ and @CheckForInterrupt(const std::string&)@.
...
John Abbott
16:16 Feature #721 (Closed): CheckForInterrupt: string arg to specify where it was called?
Anna indirectly suggested that it might be nice to have an optional arg to @CheckForInterrupt@ which takes a string i... John Abbott
12:03 Feature #718 (In Progress): Insert calls to CheckForInterrupt
Nice! I added it into @TmpGReductor.C@ (I was actually doing something else with very slow GB ;-) )... Anna Maria Bigatti

22 May 2015

13:45 Slug #675: Matrix determinant over multivariate poly ring
A Google search for "division free algorithm for determinant" produces several hits. Possibly something there may be... John Abbott
13:21 Slug #675 (In Progress): Matrix determinant over multivariate poly ring
I have changed @myDet@ in @DenseMatrix.C@ so that it calls @DetDirect@ only if there are at least 3 indets and the ma... John Abbott

21 May 2015

16:02 Bug #666 (Feedback): RatReconstructByLattice fails in some simple cases
I have added a comment to the documentation.
I discussed with Christof the possibility of throwing an exception wh...
John Abbott
10:54 Feature #718: Insert calls to CheckForInterrupt
I suggest we keep a log here of the files we have looked at with a view to inserting calls to @CheckForInterrupt@. John Abbott
10:52 Feature #718 (Resolved): Insert calls to CheckForInterrupt
So that interrupts are acted upon we must insert calls to @CheckForInterrupt@ in various places -- principally in loo... John Abbott
09:41 Feature #714 (Resolved): Interrupt mechanism
I have checked in the impl with both *(A)* and *(B)*.
Then I deleted *(A)* and checked in again. This way I hope *(...
John Abbott
09:38 Feature #715 (Resolved): RandomSubsetIndices, RandomTupleIndices?
I have already reported this (and logged time) in issue #622.
I think @RandomSubsetIndices@ is likely to be useful...
John Abbott

20 May 2015

19:13 Feature #573: Use symbolic links for external libraries
John Abbott wrote:
> What is the current status? Has the cleaning been done? It has been working fine for several ...
Anna Maria Bigatti
17:24 Feature #573 (Feedback): Use symbolic links for external libraries
What is the current status? Has the cleaning been done? It has been working fine for several months, so changing st... John Abbott
12:47 Feature #715 (Closed): RandomSubsetIndices, RandomTupleIndices?
In CoCoA we have *RandomSubsetIndices, RandomTupleIndices*.
Could they be useful in CoCoALib?
If so implement trans...
Anna Maria Bigatti
12:38 Feature #714: Interrupt mechanism
John Abbott wrote:
> Is there any sense in offering approach *(A)*? Perhaps it is best to offer just *(B)*, and add ...
Anna Maria Bigatti
12:21 Feature #714: Interrupt mechanism
I am undecided about which ways to offer for telling the GlobalManager which interrupt flag to watch:
* *(A)* specif...
John Abbott
10:22 Slug #675: Matrix determinant over multivariate poly ring
in the cocoa manual there is this example... Anna Maria Bigatti

19 May 2015

17:55 Feature #714: Interrupt mechanism
Also seems to work with the C5 GUI now :-)
John Abbott
16:56 Feature #714 (In Progress): Interrupt mechanism
I have implemented a first version following the outlines given above.
It seems to pass a quick test -- I have mad...
John Abbott
11:41 Feature #714: Interrupt mechanism
Here is a further complication: how to handle several libraries together?
Let us suppose that CoCoALib has a mechani...
John Abbott
10:16 Feature #714: Interrupt mechanism
There is a slight risk in my proposal above. If @SignalInterrupt@ is called asynchronously while @CheckForInterrupt@... John Abbott
10:09 Feature #714: Interrupt mechanism
As far as CoCoA-5 is concerned CoCoALib is "external software", and the problem noted in #713 applies as much to CoCo... John Abbott
10:04 Feature #714 (Closed): Interrupt mechanism
Add an interrupt mechanism to CoCoALib.
John Abbott

18 May 2015

12:16 Feature #222: Printing polynomials - spaces between terms
This issue has been idle for another year.
John Abbott

17 May 2015

10:31 Design #710: Update normaliz interface?
The revised @normaliz@ interface aims to be backward compatible.
JAA prefers the new names in @normaliz@, and woul...
John Abbott
10:29 Design #710 (In Progress): Update normaliz interface?
Normaliz is about to release version 3.0.
This has a revised interface (_e.g._ new names for certain existing feat...
John Abbott
10:27 Feature #253: W.Bruns's wish list
Can we finish this issue in the near future?
John Abbott

15 May 2015

19:28 Design #683 (Resolved): Module index component in internal compressed representation
tested both with @unsigned int@ and @unsigned char@: it works!!... Anna Maria Bigatti
18:43 Design #683: Module index component in internal compressed representation
Bug probably found.... my fault
John has implemented in GBEnv.C...
Anna Maria Bigatti
19:11 Design #707 (In Progress): MatrixOrderingMod32749Impl: test and write documentation!
Some notes:
In @OrdvArith.H@ there is this comment:...
Anna Maria Bigatti
18:47 Design #707 (In Progress): MatrixOrderingMod32749Impl: test and write documentation!
32749 is the biggest prime with some guarantee for <I-cant-remember-what>, so the order matrix is actually over ZZ/(3... Anna Maria Bigatti
15:51 Bug #705 (Feedback): DetDirect calls myAddMul with 0 argument -- funny compilation problem??
I still don't understand why it seemed to work (maybe a missing cvs checkout)
The problem is a simple (when you know ...
Anna Maria Bigatti
12:28 Bug #705 (Closed): DetDirect calls myAddMul with 0 argument -- funny compilation problem??
with (CoCoA-5) input:... Anna Maria Bigatti
09:12 Design #703 (New): Add more operations between modules (CoCoALib)
Add more module operations: +, colon, ...
(there are also some operations for modules in CoCoA-5 packages)
The ma...
Anna Maria Bigatti

13 May 2015

17:59 Feature #658: Indets actually in a poly (or vector or matrix)
An advantage of @vector<bool>@ is that it avoids the problem/incompatibility of indices in C++ starting from 0 (both ... John Abbott
14:40 Slug #701: Makefile; limit dependencies on external libs
This issue is not so important (hence priority *low*); not even sure it is worth fixing, as it may complicate the bui... John Abbott
14:37 Slug #701 (Rejected): Makefile; limit dependencies on external libs
If you have CoCoALib already (configured and) compiled, and want to repeat compilation but also including an external... John Abbott
 

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