Activity

From 04 Mar 2015 to 02 Apr 2015

17:55 CoCoA-5 Support #677 (New): Credits to CoCoA-5 contributors: If we want (and we want) to attract contributions we need to find a proper way to give them credits for their work, a... Anna Maria Bigatti
17:53 CoCoALib Support #676 (In Progress): Credits to CoCoALib contributors: If we want (and we want) to attract contributions we need to find a proper way to give them credits for their work, a... Anna Maria Bigatti

09:18 CoCoALib Slug #675: Matrix determinant over multivariate poly ring: In my specific instance the direct algorithm (as alternating sum of products) would be best.
The problem with mult... John Abbott
09:16 CoCoALib Slug #675 (In Progress): Matrix determinant over multivariate poly ring: CoCoA can be too slow and require too much RAM for computing determinant of a matrix of multivariate polynomials.
... John Abbott

11:53 CoCoALib Bug #15: Adjoint of a non-invertible matrix: I am planning to implement a direct algorithm: each entry in the @adj@ is just a determinant, and each determinant is... John Abbott

15:59 CoCoALib Bug #15: Adjoint of a non-invertible matrix: Even @AdjByDetOfMinors@ takes too long for a 6x6 matrix of distinct indets. Why?
*2015-03-26 NOTE* I think the prob... John Abbott
15:22 CoCoALib Bug #15: Adjoint of a non-invertible matrix: @adj@ is a very simple function: it chooses between @AdjByDetOfMinors@ and @AdjByInverse@.
What do you think @AdjB... John Abbott
14:52 CoCoALib Bug #15 (In Progress): Adjoint of a non-invertible matrix: I do not recall when, but @adj@ has aleady been added to CoCoALib.
It has a *VERY BAD SLUG*: even after several mi... John Abbott

14:50 CoCoA-5 Feature #674: Ring constructor: allow empty range for indices?: John Abbott wrote:
> I understand your point.
> Actually, I suppose the correct solution is to use anonymous ind... Anna Maria Bigatti
14:35 CoCoA-5 Feature #674 (In Progress): Ring constructor: allow empty range for indices?: I understand your point. Actually, I suppose the correct solution is to use anonymous indets for the dummies, but we... John Abbott
13:56 CoCoA-5 Feature #674: Ring constructor: allow empty range for indices?: John Abbott wrote:
> There would be no technical problem allowing a range such as 1..0; perhaps the main question is... Anna Maria Bigatti
13:21 CoCoA-5 Feature #674: Ring constructor: allow empty range for indices?: There would be no technical problem allowing a range such as 1..0; perhaps the main question is whether the gain in e... John Abbott
11:08 CoCoA-5 Feature #674 (Rejected): Ring constructor: allow empty range for indices?: I am writing a CoCoA-5 program which may need some "dummy" variables. My code looks like this:... John Abbott
13:55 CoCoA-5 Support #654 (Feedback): Rename adjoint to adjugate???: After speaking to Anna about it on Skype, we decided that it is simplest to call the function @adj@ (in the same way ... John Abbott

13:14 CoCoA-5 Feature #673: Error message: I was expecting...: The relevant source code is @Parser.H:156@
The following rule may help identify the "type" of a parser token:
* s... John Abbott
13:10 CoCoA-5 Feature #673 (Closed): Error message: I was expecting...: The generic error message... John Abbott
13:07 CoCoA-5 Design #668: Remove keyword "weights"?: It works... more or less. @A["weights"]@ gives the error I wanted, but @A.weights@ still gives a less helpful error.... John Abbott

21:09 CoCoA-5 Design #668: Remove keyword "weights"?: At the moment I have implemented @setField@ and @setFieldNoCheck@; the latter is just the old fn renamed. The new fn... John Abbott
20:13 CoCoA-5 Design #668: Remove keyword "weights"?: In @Interpreter.H:718@ the mem fn @setField@ is declared as @virtual@; why??
John Abbott
16:27 CoCoA-5 Bug #670: Error column indicator misaligned with non-printing (unprintable) characters: Relevant source code is @Lexer.C:615@ and following lines.
Already have a prototype; currently prints out # instea... John Abbott
11:38 CoCoA-5 Bug #672: Emacs UI: strange string literal causes crash: The EmacsUI really seems to do strange things when the input contains unprintable chars. I am guessing that it is th... John Abbott

00:45 CoCoA-5 Bug #672: Emacs UI: strange string literal causes crash: Other chars which give trouble include those with ASCII code 3, ...
[to be completed]
John Abbott
21:35 CoCoA-5 Bug #672 (Closed): Emacs UI: strange string literal causes crash: I created a file (@CRASH.cocoa5@) containing the following:... John Abbott
13:49 CoCoA-5 Bug #671 (New): Emacs UI: swapped splitting: In some cases emacs splits (top+bottom) swapping the buffers, i.e. *cocoa5* at the bottom.
Investigate and fix. Anna Maria Bigatti
13:33 CoCoA-5 Bug #670 (In Progress): Error column indicator misaligned with non-printing (unprintable) characters: I was thinking that the substitution for unprintable chars would occur only when printing out source code for the pur... John Abbott
11:26 CoCoA-5 Bug #670: Error column indicator misaligned with non-printing (unprintable) characters: John Abbott wrote:
> A very simple idea would be to replace unprintable characters by a single printable character (... Anna Maria Bigatti

20:31 CoCoA-5 Design #668: Remove keyword "weights"?: After speaking to Anna by Skype we have decided:
* Anna will remove the keyword @weights@ (from interpreter and UIs)... John Abbott
11:21 CoCoA-5 Design #668: Remove keyword "weights"?: I should also modify @RECORD::setField@ so that it gives an error if the field name is not a valid identifier for CoC... John Abbott
11:10 CoCoA-5 Design #668: Remove keyword "weights"?: This is trickier than I originally thought.
The way the CoCoA-5 interpreter is designed a keyword is always seen a... John Abbott
20:28 CoCoA-5 Bug #670: Error column indicator misaligned with non-printing (unprintable) characters: A very simple idea would be to replace unprintable characters by a single printable character (_e.g._ @?@) this would... John Abbott
20:24 CoCoA-5 Bug #670 (Closed): Error column indicator misaligned with non-printing (unprintable) characters: While doing some "fuzz" testing with CoCoA-5 I noticed that error messages seemed to indicate the wrong columns; then... John Abbott
17:26 CoCoA-5 Bug #669 (New): NUL char in input terminates CoCoA-5: I tried a "fuzzing" test with CoCoA-5 (feeding the executable as input).
CoCoA-5 treats a NUL (ASCII code 0) as end-... John Abbott

18:43 CoCoA-5 Design #668: Remove keyword "weights"?: The involved lines are:... Anna Maria Bigatti
18:40 CoCoA-5 Design #668 (In Progress): Remove keyword "weights"?: The problem arose when Claudia Fassino worked with @PreprocessPoint@, and had trouble getting the value of @P.weights... Anna Maria Bigatti
18:26 CoCoA-5 Design #668 (Closed): Remove keyword "weights"?: In CoCoA-4 "Weights" was used to set weights in a polynomial ring construction.
Now weights are dealt with in a comp... Anna Maria Bigatti

20:08 CoCoALib Feature #667: factor: multivariate + finite characteristic: Factorizing in @F_q[x]@ is largely the same as factorizing in @F_p[x]@; the algorithm is essentially the same (but co... John Abbott
16:45 CoCoALib Feature #667: factor: multivariate + finite characteristic: John Abbott wrote:
> The squarefree decomposition is the normal first step, but there are other problematic steps (_... Anna Maria Bigatti
13:31 CoCoALib Feature #667: factor: multivariate + finite characteristic: The squarefree decomposition is the normal first step, but there are other problematic steps (_e.g._ mapping down to ... John Abbott

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