CoCoA » CoCoA-5

01 Mar 2021

21:13 Bug #1171: RealRoots: first point is sometimes wrong?

I have added a short comment to the documentation.
I can see that it might be nice to have a version of @RealRoots... John Abbott

18:04 Support #911: CoCoA-5 prompt for incomplete input

I have now removed dot-dot-dot from the prompt prefix.
Also when inside a multi-line comment, the prompt now says *@... John Abbott

23 Feb 2021

10:39 Slug #1578: SLUG: RationalSolve slow and stupid

Some ideas:
* if there is a univariate poly, factorize it, and take just the univariate factors; use these to elim a... John Abbott

10:27 Bug #1537 (Resolved): EmacUI: strange colours, sometimes

I have just updated issue #1538. This can probably be considered as an acceptable resolution of the problem reported... John Abbott

22 Feb 2021

23:03 Feature #1536 (Feedback): Implement xel?

I have added doc, but no tests (too lazy/tired).
John Abbott

22:00 Feature #1536: Implement xel?

Anna has too much else to do. So I have knocked up a quick impl... brain off, just cut-and-paste... and hope!
Per... John Abbott

20:47 Bug #1171: RealRoots: first point is sometimes wrong?

We could try to mimic the hack described in issue #1573, where the values are checked at the approx solutions, and re... John Abbott

20:31 Support #911: CoCoA-5 prompt for incomplete input

I am not convinced of the utility of the dot-dot-dot when the supplementary prompt is non-empty.
It is hard to expla... John Abbott

20:27 Support #911: CoCoA-5 prompt for incomplete input

The supplementary part of the prompt comes from *@openBlocks@*.
I have no idea how the value of @openBlocks@ is upda... John Abbott

20:25 Support #911: CoCoA-5 prompt for incomplete input

Here is what my personal CoCoA does currently:... John Abbott

17:31 Support #911: CoCoA-5 prompt for incomplete input

I am wondering about enclosing the prompt prefix in square brackets.
I also wonder whether the case of a prefix cont... John Abbott

17:21 Feature #500: Interpreter: is it possible to avoid useless prompts?

I have added a command line option *@--no-prompt@* which forces the function which produces the prompt string to retu... John Abbott

15:22 Slug #1578 (New): SLUG: RationalSolve slow and stupid

The following system can easily be solved by hand, but CoCoA is very slow... John Abbott

19 Feb 2021

17:26 Bug #1577 (Resolved): radical: lex order, ERROR: Ring is not standard graded

Anna has implemented the obvious workaround: map into a new poly ring (with degrevlex), and then unmap the result.
S... John Abbott

17:00 Bug #1396 (Resolved): Website: download page for CoCoA-4 burns CPU

Anna removed some Java script... now seems OK.
John Abbott

09:50 Feature #1112: New function: IsEmpty

The function *@IsEmpty@* is slower than explicitly testing for equality to the empty list; why should that be?
He... John Abbott

18 Feb 2021

22:18 Feature #1112 (Resolved): New function: IsEmpty

I have just added a first impl to @BuiltInFunctions.C@.
A couple of trivial tests passed.
Still need to: write te... John Abbott

22:07 Feature #250 (Feedback): CoCoALib BuildInfo vs CoCoA-5 VersionInfo

The code in @VersionInfo.C@ looks clean and simple to me.
I think this issue has been resolved some time ago.
Movin... John Abbott

22:05 Bug #1396: Website: download page for CoCoA-4 burns CPU

The problem still exists :-(
John Abbott

22:03 Design #474: Eliminate package BinRepr

It looks to me as though this could easily be converted into C++ (in CoCoALib).
Perhaps just an afternoon suffices..... John Abbott

22:00 Bug #1215 (Feedback): RationalSolve: gives "Error: must be non-zero"

Is this issue a *duplicate* of issue #724?
I think so. Anyway, I tried the example mentioned in the description, an... John Abbott

17 Feb 2021

19:03 Bug #946: Function "ideal" evaluates the argument twice

I have just checked in my revised code (even though it still needs to be cleaned).
We must develop a proper test s... John Abbott

18:33 Design #1540 (Resolved): Double power

I think I have solved the main problem and also the one mentioned in comment 2.
Solution is not elegant, but I do no... John Abbott

16 Feb 2021

14:41 Bug #946: Function "ideal" evaluates the argument twice

I might have fixed this (for ideals)... and probably introduced some new weird bugs.... the interpreter code is not e... John Abbott

14:09 Slug #1392 (Resolved): ApproxSolve: another slow example

The example given is quite quick now (0.5s on my computer).
Marking as "resolved" (don't know by whom or when).
John Abbott

14:04 Bug #1574: ApproxSolveTF

The code seems to be a bit convoluted. It'll take time to work out what it is supposed to be doing... not today!
John Abbott

15 Feb 2021

22:49 Bug #1577: radical: lex order, ERROR: Ring is not standard graded

The full error mesg is:... John Abbott

22:48 Bug #1577 (Closed): radical: lex order, ERROR: Ring is not standard graded

This should not happen:... John Abbott

22:20 Bug #1567 (Feedback): Radical in non-zero char

I have check in the changes (some time ago). So moving status to _feedback_. John Abbott

12 Feb 2021

12:19 Bug #724 (Resolved): RationalSolve: wrongly complains about non zero-dim even in finite char

The example from issue #723 is way too slow to act as a test case -- do we have a more sane test case? How about the... John Abbott

12:16 Feature #723: Referring to indets with multiple indices from a polyring

The example in comment 2 is slow because it takes along time to test @IsZeroDim@ _i.e._ compute a GB.
I stopped th... John Abbott

11:54 Slug #1270 (Feedback): RationalSolve: use MinPolyQuot instead of elim

I have just tried the example from comment 5, and @RationalSolve@ is now tolerably fast (less than 2s).
John Abbott

11 Feb 2021

00:13 Support #1252: ShapeLemma: no manual entry

What is the status of this issue?
John Abbott

00:12 Bug #1573 (Resolved): ApproxSolve: very imprecise

I have now added an extra loop which checks the values of the polys at the points found.
If the values are not "heur... John Abbott

00:08 Bug #1216 (Feedback): RationalSolve: gives wrong answer

I have implemented the new field names, and updated doc, tests, manual.
New state: Feedback. John Abbott

17:56 Bug #1216: RationalSolve: gives wrong answer

> Possible names are *@AffinePts@* and *@ProjectivePts@* (or *@ProjPts@*).
I vote for *@AffinePts@* and *@Projecti... Anna Maria Bigatti

10 Feb 2021

21:33 Bug #1216: RationalSolve: gives wrong answer

Feedback and constructive criticism are welcome!
I'd like to close this issue soon.
John Abbott

21:28 Bug #1216: RationalSolve: gives wrong answer

Now I wonder what the names of the fields in the records should be.
It may be sensible to use different names for th... John Abbott

20:50 Bug #1216: RationalSolve: gives wrong answer

Anna has approved the suggestion in comment 13 (just above) about returning a record.
Now I must impl, and revise th... John Abbott

09 Feb 2021

15:22 Bug #727: Emacs UI: send-file (C-c C-f) should check if buffer and file are synchronized

I got caught out by this just a short while ago.
I have searched on internet, but there does not seem to be an eas... John Abbott

05 Feb 2021

15:41 Bug #1216: RationalSolve: gives wrong answer

I am wondering about changing the return value of @RationalSolve@ into a record, _e.g._
*currently* we get... John Abbott

04 Feb 2021

21:05 Bug #1216: RationalSolve: gives wrong answer

I have modified my copy of the code. It now behaves more "predictably".
*@RationalSolve@* now searches only for _... John Abbott

03 Feb 2021

17:48 Bug #1574: ApproxSolveTF

I have set the target version as 5.3.6, but maybe it could be postponed?
It is a bit strange that the solution [0,... John Abbott

17:46 Bug #1574 (New): ApproxSolveTF

@ApproxSolveTF@ is not documented. Maybe that is a good thing...... John Abbott

17:26 Bug #1216: RationalSolve: gives wrong answer

I now think it might be better to avoid the "clever" function @RationalSolve@ which tries to guess whether it should ... John Abbott

31 Jan 2021

10:43 Bug #1216: RationalSolve: gives wrong answer

Bernhard Andraschko reportes the following:... John Abbott