Activity
From 09 Apr 2019 to 08 May 2019
05 May 2019
- 10:07 CoCoALib Feature #1282 (New): subresultant
- A long time ago Ring Xiao sent an implementation of Ducos's subresultant chain algorithm.
Clean it, and incorporate ...
04 May 2019
- 21:05 CoCoALib Bug #1281: Factor of multivariate sometimes prints ERROR
- The simplest examples (with 3 terms) seem to be of deg 7 (none found in deg 6 or deg 5)....
- 20:55 CoCoALib Bug #1281 (New): Factor of multivariate sometimes prints ERROR
- Here is an example:...
03 May 2019
- 20:36 CoCoALib Bug #1280: Determinant & Inverse of matrix over non integral domain
- I'm now wondering what is the difference between @ConstMatrixViewBase::myDet@ and @DenseMatImpl::myDet@...
- 16:35 CoCoALib Bug #1280: Determinant & Inverse of matrix over non integral domain
- I'd like to rewrite @ConstMatrixViewBase::myDet@ so that it calls the "fast" impls for small matrices. How to do thi...
- 15:59 CoCoALib Bug #1280 (In Progress): Determinant & Inverse of matrix over non integral domain
- Some thoughts about computing the determinant.
There is special case code for:
* small matrices (up to 5x5 incl.)... - 13:57 CoCoALib Bug #1280: Determinant & Inverse of matrix over non integral domain
- Here is a simple failing case:...
- 13:51 CoCoALib Bug #1280 (In Progress): Determinant & Inverse of matrix over non integral domain
- CoCoA gives unnecessary errors when computing det or inverse of a matrix over a non-integral domain.
Rectify! - 14:05 CoCoALib Support #1263: Tidy CoCoALib test directory
- I have just checked that running *all* @test-bugNNN@ executables takes about 0.03s on my computer. Since these files...
- 13:45 CoCoALib Feature #303: Rows and Columns of a matrix
- I have now added @GetRow@, @GetCol@, @GetRows@ and @GetCols@ to @MatrixOps.txt@
Fixed a couple of minor bugs. Is ... - 13:24 CoCoALib Feature #303 (Resolved): Rows and Columns of a matrix
- I have just implemented @GetRow@, @GetCol@, @GetRows@ and @GetCols@.
Perhaps the names are not ideal, but they are... - 11:47 CoCoALib Design #1279 (Closed): Tidy up code for matrix determinant
- I recently encountered an unexpected error while trying to compute the determinant of a 2x2 matrix over @ZZ/(841)@ wh...
- 11:42 CoCoALib Feature #1278 (New): Port old "clever" code for matrix determinant over ZZ to CoCoALib
- In CoCoA-4 there was a "clever" implementation of matrix determinant(over ZZ) based on the paper with Bronstein and M...
- 11:39 CoCoALib Feature #11 (Closed): Bareiss algorithm
- This was done ages ago. It has been working trouble-free for over 2 years.
Closing. - 11:35 CoCoALib Slug #691 (Closed): Matrix determinant over ZZ
- I think this was resolved some time ago when I arranged for the code to recognise the case that the entries are all i...
30 Apr 2019
- 17:18 CoCoALib Design #925: MachineInt or long for args which are indices (yet again)
- Postponing because there are too many other more pressing issues. Anyway the current code works adequately, so it is...
- 11:51 CoCoALib Feature #813: Implement "elim" in CoCoALib
- It would be nice to complete this before the next release! To this end, I have increased the priority...
- 10:54 CoCoALib Feature #1277: Gaussian row reduction
- NTL's doc shows just one fn *@gauss@* which accepts 2 args: matrix @M@ and an optional integer @w@ (default is number...
- 10:44 CoCoALib Feature #1277: Gaussian row reduction
- The request seems reasonable to me.
Not yet sure what the best design might be, but I suggest the following as a s... - 10:40 CoCoALib Feature #1277 (Closed): Gaussian row reduction
- Julian Danner (Passau) would like CoCoA to offer matrix row reduction via gaussian elimination.
Discuss, design, i... - 10:35 CoCoA-5 Bug #1273: NewPolyRing and SymbolRange together make a crash
- I must get my CVS access sorted out, so I can check in.
29 Apr 2019
- 21:05 CoCoALib Support #1276: Release 0.99650
- List of principal changes made: *19th november 2019*
* NO LONGER C++03 compatible! We are moving towards C++14 (#89... - 21:03 CoCoALib Support #1276 (Closed): Release 0.99650
- Description
Everything related to making a CoCoALib release:
* Redmine Roadmap: close or postpone issue
* ... - 18:38 CoCoALib Support #1039 (Resolved): Rename iroot?
- I have changed the names into *@FloorRoot@* and *@IsExactFloorRoot@*.
Added *@iroot@* to @obsolescent.H/C@.
Test an... - 13:25 CoCoALib Support #1039: Rename iroot?
- Even though GMP allows negative inputs to its @mpz_root@ function, I like the idea of limiting the number whose root ...
- 18:21 CoCoA-5 Bug #1273: NewPolyRing and SymbolRange together make a crash
- Another problem was in @evalArgAsListOfSymbols@ which did a dynamic pointer cast and used the result without checking...
- 14:21 CoCoA-5 Bug #1273 (Resolved): NewPolyRing and SymbolRange together make a crash
- One problem appears to be on line 46 of @cocolib.cpkg5@: replace *@[i]@* with just *@i@*.
- 14:18 CoCoA-5 Bug #1273: NewPolyRing and SymbolRange together make a crash
- The *@SymbolRange@* impl looks very suspect. It does not properly check its arg types.
Fn is defd in @coclib.cpkg... - 14:14 CoCoA-5 Bug #1273 (Closed): NewPolyRing and SymbolRange together make a crash
- The problem is with double indices. Here is a small failing example:...
- 18:00 CoCoA-5 Slug #1228: SLUG: filling an array
- I think I have found a situation where my simple idea in comment 6 causes trouble......
- 17:53 CoCoA-5 Slug #1275 (New): incr and decr are slow
- The CoCoA-5 functions @incr@ and @decr@ are disappointingly slow....
- 15:26 CoCoA-5 Bug #1274 (Resolved): SortBy and SortedBy sometimes give wrong result
- The bug was at the end of the first loop in *@QuickSortBy1@* where the case @Up = Down@ was not handled.
Added 1 l... - 14:56 CoCoA-5 Bug #1274 (In Progress): SortBy and SortedBy sometimes give wrong result
- Example found by calling @SortedBy@ on random permutations of 1..17.
Seems to work find for lists with only 16 or fe... - 14:53 CoCoA-5 Bug #1274 (Closed): SortBy and SortedBy sometimes give wrong result
- In CoCoA5 the *@SortBy@* and *@SortedBy@* functions sometimes give wrong answers!
Here is an example:... - 13:57 CoCoALib Support #1263: Tidy CoCoALib test directory
- I have noticed that there some tests which run quickly (_e.g._ less than 0.01s on my computer), but the compilation t...
18 Apr 2019
- 18:10 CoCoA-5 Feature #1272: Groebner Bases over ZZ
- Very subtle: it gets to this...
- 17:49 CoCoA-5 Feature #1272: Groebner Bases over ZZ
- @NR@ bug:...
- 17:36 CoCoA-5 Feature #1272: Groebner Bases over ZZ
- As a starting point Elisa Palezzato noticed a bug in @NR@: it does not check the ring of coefficients is a field.
- 17:26 CoCoA-5 Feature #1272 (Closed): Groebner Bases over ZZ
- Write a basic implementation for Groebner Bases over the integers
17 Apr 2019
- 10:17 CoCoA-5 Feature #1271 (In Progress): Allow Interruption of printing?
- Which printing commands should allow themselves to be interrupted?
* lists
* matrices
* ideals (?)
I think prob... - 08:26 CoCoA-5 Feature #1271: Allow Interruption of printing?
- I agree this would be very useful.
Strange for the error!
16 Apr 2019
- 17:49 CoCoA-5 Feature #1271: Allow Interruption of printing?
- I have a tried a first approach, but it did no work as I would have liked...
What I tried:
* in @Interpreter.C@ a... - 17:43 CoCoA-5 Feature #1271 (In Progress): Allow Interruption of printing?
- Inside emacs, if you print out a very long list then it takes ages before you can use emacs/CoCoA-5 again.
Conside...
09 Apr 2019
- 17:48 CoCoALib Feature #1267: Ideal equality
- I'm very uneasy in doing an automatic choice: the "trick" might work out as a slow overhead in a long loop with many ...
- 10:50 CoCoALib Support #1134: Organize better the documentation for CoCoALib
- I am postponing this issue. Even though I think it is important, it is likely to need a lot of time; anyway, the doc...
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