John Abbott's activity
From 01 Apr 2019 to 30 Apr 2019
30 Apr 2019
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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...
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- It would be nice to complete this before the next release! To this end, I have increased the priority...
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- NTL's doc shows just one fn *@gauss@* which accepts 2 args: matrix @M@ and an optional integer @w@ (default is number...
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- The request seems reasonable to me.
Not yet sure what the best design might be, but I suggest the following as a s... -
- Julian Danner (Passau) would like CoCoA to offer matrix row reduction via gaussian elimination.
Discuss, design, i... -
- I must get my CVS access sorted out, so I can check in.
29 Apr 2019
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- List of principal changes made: *19th november 2019*
* NO LONGER C++03 compatible! We are moving towards C++14 (#89... -
- Description
Everything related to making a CoCoALib release:
* Redmine Roadmap: close or postpone issue
* ... -
- I have changed the names into *@FloorRoot@* and *@IsExactFloorRoot@*.
Added *@iroot@* to @obsolescent.H/C@.
Test an... -
- Even though GMP allows negative inputs to its @mpz_root@ function, I like the idea of limiting the number whose root ...
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- Another problem was in @evalArgAsListOfSymbols@ which did a dynamic pointer cast and used the result without checking...
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- One problem appears to be on line 46 of @cocolib.cpkg5@: replace *@[i]@* with just *@i@*.
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- The *@SymbolRange@* impl looks very suspect. It does not properly check its arg types.
Fn is defd in @coclib.cpkg... -
- The problem is with double indices. Here is a small failing example:...
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- I think I have found a situation where my simple idea in comment 6 causes trouble......
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- The CoCoA-5 functions @incr@ and @decr@ are disappointingly slow....
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- The bug was at the end of the first loop in *@QuickSortBy1@* where the case @Up = Down@ was not handled.
Added 1 l... -
- Example found by calling @SortedBy@ on random permutations of 1..17.
Seems to work find for lists with only 16 or fe... -
- In CoCoA5 the *@SortBy@* and *@SortedBy@* functions sometimes give wrong answers!
Here is an example:... -
- I have noticed that there some tests which run quickly (_e.g._ less than 0.01s on my computer), but the compilation t...
17 Apr 2019
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- Which printing commands should allow themselves to be interrupted?
* lists
* matrices
* ideals (?)
I think prob...
16 Apr 2019
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- I have a tried a first approach, but it did no work as I would have liked...
What I tried:
* in @Interpreter.C@ a... -
- 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
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- I am postponing this issue. Even though I think it is important, it is likely to need a lot of time; anyway, the doc...
05 Apr 2019
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- Before we decide to replace @elim@ by @MinPolyQuot@ we should check that @MinPolyQuot@ is usually faster (I would cer...
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- Currently @RationalSolve@ uses @elim@, but every use is equivalent to a call to @MinPolyQuot@ (in the subring generat...
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- This really the same as #743.
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- It would be nice to have a quiet moment to get this matter properly sorted out.
We really should try to deal with ... -
- I have modified the subject and description to refer to C++14 instead of C++11.
There is a summary of the integral... -
- We should check whether this still makes sense with C++14. I should also check on my little 32-bit machine...
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- The idea is simple: compute the det modulo various primes, and if any is non-zero then we know the non-modular det is...
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- A similar trick could be used for ideal membership: if @x@ is not in @I+J@ then it is certainly not in @I@.
04 Apr 2019
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- It seems that there is already an impl in @SparsePolyOps-RingElem@.
There is no doc, no test. Also not exported t... -
- Long sent me one example which wanted to test if a large ideal (in a ring with 36 indets) contained 1. He actually d...
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- A colleague here in Passau was disappointed that @intersection(ideal(1), J)@ was taking a long time, even though the ...
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- Generators which are monomials are also a special case.
Then one could imagine a more complicated "mixed" situatio...
03 Apr 2019
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- I can make some notes based on the questions I've been asked.
These notes could form a basis for a better guide; b... -
- Some students here in Passau have been given the task of writing a CoCoA package, and have asked me for guidance. It...
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- What is the status of this issue?
The package still exists, and there is a *@BinRepr@* builtin function.
Can we d... -
- This has already been done. Closing.
02 Apr 2019
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- Anna has just sent me some code with redundant @#include@ directives removed.
Most compilation times are the same. ... -
- I believe that built-in functions (for extlibs, at least) are "registered" by constructing a global object. So the a...
01 Apr 2019
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- Indeed "duplication" is generally undesirable (as is the use of @goto@), but it may still be a good idea in certain "...
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- Yesterday I ran the compiler with the *@-E@* option, which just does the preprocessing steps. Since currently I do n...
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