Activity

From 30 Sep 2017 to 29 Oct 2017

17:45 CoCoALib Bug #1113 (Closed): gcd crashes (Floating point exception): In an old file (from 2006) I found two examples where GCD (in CoCoA4) crashes because it runs out of primes; since we... John Abbott
11:53 CoCoALib Design #703: Add more operations between modules (CoCoALib): Reminder. Add +. Anna Maria Bigatti
11:33 CoCoA-5 Feature #1112 (Closed): New function: IsEmpty: add function @IsEmpty(L)@ for LIST.
Anna Maria Bigatti

16:14 CoCoA-5 Support #1111: CoCoAManual: searching for ?? mat and for ?? matrix give different results: I was hoping to have an interesting issue with number 1111; instead it is just this... sigh!
My guess is that a Co... John Abbott
16:12 CoCoA-5 Support #1111 (Closed): CoCoAManual: searching for ?? mat and for ?? matrix give different results: In CoCoA-5... John Abbott
13:29 CoCoALib Slug #1110 (Closed): Determinant of matrix over QQ (whose entries are actually integers): CoCoA-5 can be much faster as computing @det(M)@ if @RingOf(M)@ is @ZZ@ than the same matrix but over the ring @QQ@.
... John Abbott

17:12 CoCoA-5 Slug #1109 (In Progress): Emacs UI can be slow in M$ Windows: I searched on internet and found some descriptions of similar problems. The suggestion is to add the following line ... John Abbott
17:08 CoCoA-5 Slug #1109 (Closed): Emacs UI can be slow in M$ Windows: At the school in Cameroon I saw that some Microsoft Windows computers were terribly slow (_e.g._ 30s delay after each... John Abbott

17:15 CoCoALib Feature #1108 (Resolved): New fn: IsCoprime (whenever gcd makes sense): I have written a first trivial implementation. Seems to work.
John Abbott
16:50 CoCoALib Feature #1108: New fn: IsCoprime (whenever gcd makes sense): The fn should be defined when *@gcd@* makes sense (_i.e._ for true GCD domains and @BigInt@).
At the moment I pref... John Abbott
16:48 CoCoALib Feature #1108 (Closed): New fn: IsCoprime (whenever gcd makes sense): Define a new fn *@IsCoprime@* which is equivalent to *@IsInvertible(gcd(arg1, arg2))@*
JAA thinks it is better to ... John Abbott
15:47 CoCoALib Feature #630 (Feedback): Add graeffe function?: Added code; doc; example.
Also made accessible to CoCoA-5.
John Abbott

16:54 CoCoA-5 Feature #1107: CoCoA Online: install (using InteractiveShell): First hard work: install properly vagrant.
(with the help of Alessandro Cartatone) Anna Maria Bigatti
16:49 CoCoA-5 Feature #1107 (New): CoCoA Online: install (using InteractiveShell): install CoCoA Online (using InteractiveShell)
Anna Maria Bigatti

15:23 CoCoA-5 Support #977: "universal denominator" (related with GroebnerFanIdeals): John Abbott wrote:
> JAA prefers INT to RINGELEM (at least for the moment).
OK, I'll change it back.
> If the co... Anna Maria Bigatti
15:19 CoCoA-5 Support #977: "universal denominator" (related with GroebnerFanIdeals): JAA prefers INT to RINGELEM (at least for the moment).
If the coeff ring is not QQ but is FracField then I'm not s... John Abbott
12:53 CoCoA-5 Support #977: "universal denominator" (related with GroebnerFanIdeals): Should @UniversalDenominator@ return @INT@ or @RingElem@?
We should also choose its name: @UniversalDen@?
Current... Anna Maria Bigatti

10:21 CoCoA-5 Slug #907: ApproxSolve very slow on this example: This is another example where @ApproxSolve@ is too slow (in CoCoA-5.2.2).
The example came from "playing with" palin... John Abbott

13:43 CoCoALib Design #1106 (Closed): Remove READLINE from CoCoALib: CoCoALib does not depend on READLINE.
Change the LDLIBS and CPP flags so that CoCoALib is completely independent of ... John Abbott

14:56 CoCoALib Slug #1105: Primary Decompositon (zero-dim) slow cases: Here are some more examples: each gen here has 4 terms... John Abbott
13:39 CoCoALib Slug #1105: Primary Decompositon (zero-dim) slow cases: The examples were generated by random search printing out successively slower cases.
John Abbott
13:38 CoCoALib Slug #1105 (Closed): Primary Decompositon (zero-dim) slow cases: Here are some cases where @PrimaryDecomposition0@ in CoCoA-5.2.2 is slow:... John Abbott
13:30 CoCoA-5 Feature #731 (In Progress): Primary Decomposition in CoCoA-5: PD for 0-dim ideals has been implemented (see issue #845)
John Abbott

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