Activity

From 11 Mar 2015 to 09 Apr 2015

21:46 CoCoALib Feature #678: Accumulator (like a geobucket): Note: perhaps also consider the design of C++ @std::accumulate@? Is there anything in BOOST?
My (vague) idea is t... John Abbott
21:36 CoCoALib Feature #678: Accumulator (like a geobucket): I have just written @DetDirect@ which computes the sum of many terms (one for each permutation). In order to get dec... John Abbott
21:30 CoCoALib Feature #678 (In Progress): Accumulator (like a geobucket): Consider creating a general "accumulator" for ring elems, a sort of generalization of a geobucket. John Abbott

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

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