CoCoA

19 Jan 2021

14:03 CoCoALib Bug #1565 (In Progress): IsInRadical: gives "weird" error

I have modified @RadicalHelpers@ in @SparsePolyOps-RadicalMembership.C@
Seems Ok now. Still testing. John Abbott

13:27 CoCoALib Bug #1565: IsInRadical: gives "weird" error

Also get:... John Abbott

13:25 CoCoALib Bug #1565 (Closed): IsInRadical: gives "weird" error

Specific example:... John Abbott

12:39 CoCoA-5 Feature #1469: Get indexed indets from a polyring

Hi,
I would highly appreciate such a function, however I think it would be even better if one must not first initial... Julian Danner

09:20 CoCoA-5 Feature #1564 (New): Geometrical theorem proving package

What is the stats of the _geometrical theorem proving_ package?
It seems the package is there, but the on-line man... John Abbott

15 Jan 2021

21:15 CoCoALib Feature #206: Matrix equation solving: LinKer

The source of *@LinKerBasis@* looks a bit dodgy.
Given a matrix it does what is expected; but it also works for a _l... John Abbott

21:07 CoCoALib Feature #206: Matrix equation solving: LinKer

This was originally in issue #122; moving it to here.
What is the difference between @LinKer@ and @LinKerBasis@?
... John Abbott

21:09 CoCoALib Feature #122 (Closed): Porting "LinKer"

This seems to be a *duplicate* of #206; since there is more info under that index, I'm closing this one. John Abbott

09:18 CoCoALib Feature #122: Porting "LinKer"

What is the difference between *@LinKer@* and *@LinKerBasis@*?
Is @LinKerBasis@ essentially the same as @GetCols(Lin... John Abbott

21:05 CoCoA-5 Design #1546 (Feedback): Improve 'describe' or 'print' for a function

This is now working fine (after Anna changed the impl of print in the interpreter). Moving to *feedback*.
John Abbott

20:56 CoCoA-5 Feature #346: Describe should indicate package name

Since @print@ and @sprint@ now produce the body of a CoCoA-5 function, it superfluous for @describe@ to do the same.
... John Abbott

20:52 CoCoA-5 Feature #346 (Resolved): Describe should indicate package name

*IMPORTANT*
* the @describe@ command describes a _value_ and not a _variable_;
* a fn defn *does not contain any in... John Abbott

09:13 CoCoA-5 Feature #346: Describe should indicate package name

Since Anna seems to have solved issue #1174, is it now possible to make progress here?
Since normal printing now p... John Abbott

20:42 CoCoA-5 Feature #531: Package protected variables should know which package protected them

In the source code indicated by Anna, there is a loop which sets @protectionReason@ (or some similar name).
These re... John Abbott

12:23 CoCoA-5 Feature #531: Package protected variables should know which package protected them

Anna Maria Bigatti wrote:
> There is something called @protectionReason@ but seems unset (very strange: the code for... Anna Maria Bigatti

10:39 CoCoA-5 Feature #531: Package protected variables should know which package protected them

modified also implementation of @unprotect@... Anna Maria Bigatti

10:30 CoCoA-5 Feature #531 (Feedback): Package protected variables should know which package protected them

Implemented: updated code of @CheckProtection@ (extra arg runtimeEnv) in Interpreter.C
(done it, before I forgot the... Anna Maria Bigatti

08:18 CoCoA-5 Feature #531: Package protected variables should know which package protected them

I might be able to fix this, see #1174 Anna Maria Bigatti

18:01 CoCoALib Support #1265 (In Progress): Unregistered TXT files in doc

Progress chart:
* *@SmallPrime.txt@* removed because very out of date
* _fill in as progress is made_ John Abbott

17:55 CoCoALib Design #1563 (Feedback): BigRat: ctor from machine int

I have now changed all calls @BigRat(...,1)@ into just @BigRat(...)@ in examples, tests, and source code.
Checking i... John Abbott

17:08 CoCoALib Design #1563 (Resolved): BigRat: ctor from machine int

I have added 2 new ctors (one from @MachineInt@ and one from @BigInt@).
They are @explicit@ (as is the ctor for @Big... John Abbott

17:05 CoCoALib Design #1563: BigRat: ctor from machine int

I have just discussed with Anna. Bruns's argument is persuasive: our original decision was to protect the user again... John Abbott

16:18 CoCoALib Design #1563 (In Progress): BigRat: ctor from machine int

There were 2 reasons for prohibiting ctor from a machine int: ambiguity of BigInt(0) since 0 could also be interprete... John Abbott

15:39 CoCoALib Design #1563 (Closed): BigRat: ctor from machine int

Bruns asks the following "why?"... John Abbott

17:13 CoCoALib Design #1180: BigRat(0) unexpectedly compiles! (calls ctor with mpq_t arg)

*IMPORTANT UPDATE*(2021-01-15) this decision has now been reversed in issue #1563 John Abbott

10:02 CoCoALib Feature #1559: Default ctor for rings

The class *@ring@* does have a default ctor (which assigns @RingZZ()@ as initial value).
In contrast, @SparsePolyRin... John Abbott

09:07 CoCoA-5 Feature #1174: package of a function --> of an identifier!

Well done! I suggest we accept the version taking a string for the time being (unless you can easily make a fn like ... John Abbott

08:29 CoCoA-5 Feature #1174: package of a function --> of an identifier!

Example:... Anna Maria Bigatti

08:11 CoCoA-5 Feature #1174: package of a function --> of an identifier!

should the name be @PackageOf@?
I have investigated: belonging to a package (variable) is a property of the variab... Anna Maria Bigatti

06:48 CoCoA-5 Bug #1531: CRASH: arithmetic with HilbertSeries (tagged object)

It (correctly) gives error both on right and left, no crash. Anna Maria Bigatti

14 Jan 2021

14:31 CoCoALib Feature #206: Matrix equation solving: LinKer

The fn *@LinKerZZ@* is available in my copy of CoCoA-5, but there is no doc.
The doc for CoCoALib seems explicit.
... John Abbott

14:27 CoCoALib Feature #122: Porting "LinKer"

Has this already been done? There are two fns in CoCoA-5: @LinKer@ and @LinKerBasis@.
What about @LinKerZZ@?
John Abbott

12 Jan 2021

14:32 CoCoALib Design #1558: CpuTimeLimit: more frequent clock checks

I have modified the impl so that it triggers only when the CPU time limit has been exceeded, but it does try to call ... John Abbott

11 Jan 2021

11:09 CoCoALib Design #1562 (New): matrix.H and MatrixView.H

To be able to use the type @ConstMatrixView@ I need to include @matrix.H@ rather than @MatrixView.H@.
Is this reas... John Abbott

10:19 CoCoALib Support #1561 (New): Doc for module term orderings

The documentation for module term orderings is unhelpful (to put it politely).
I wanted to find out whether a @Fre... John Abbott

10:02 CoCoA-5 Bug #1560: elim for modules

Not sure how hard this might be. Does it suffice to create a poly ring with elim order, and then compute the GB for ... John Abbott

09:59 CoCoA-5 Bug #1560 (New): elim for modules

Bernhard Andraschko reported the following NYI:... John Abbott

08:55 CoCoALib Design #1558: CpuTimeLimit: more frequent clock checks

John Abbott wrote:
> Now I am wondering whether it may not make more sense to base @CpuTimeLimit@ on the "steady clo... Anna Maria Bigatti

09 Jan 2021

18:20 CoCoALib Feature #1559 (In Progress): Default ctor for rings

Winfried Bruns sent the following by email:
"I wanted to define a class that contains two sparesepoly rings as mem... John Abbott

08 Jan 2021

18:46 CoCoALib Bug #1376 (Resolved): GBasisTimeout: not working as expected

Using just the one example "french students" example, the current (2021-01-08) version of @CpuTimeLimit@ works accept... John Abbott

09:48 CoCoALib Bug #1376: GBasisTimeout: not working as expected

Now I think it should be possible to make @CpuTimeLimit@ check the time more frequently without much overhead (by che... John Abbott

18:11 CoCoALib Design #1558 (Resolved): CpuTimeLimit: more frequent clock checks

I now have a version of @CpuTimeLimit@, which actually uses only "steady clock" rather than @CpuTime@.
It seems to... John Abbott

16:11 CoCoALib Design #1558: CpuTimeLimit: more frequent clock checks

Now I am wondering whether it may not make more sense to base @CpuTimeLimit@ on the "steady clock" (but then the nam... John Abbott

10:07 CoCoALib Design #1558 (In Progress): CpuTimeLimit: more frequent clock checks

Here is the code I used as a speed check:... John Abbott

09:38 CoCoALib Design #1558 (Closed): CpuTimeLimit: more frequent clock checks

The impl of @CpuTimeLimit@ is a bit complicated because the @CpuTime@ function is more expensive than I had expected.... John Abbott

15:23 CoCoA-5 Feature #1516 (Resolved): substring function

I have written a (short) manual entry.
Should there be some tests? :-/
John Abbott

15:16 CoCoA-5 Feature #1516: substring function

I have written a first version (in @BuiltinFunctions.C@).
* name: *@substring@*; I prefer not to use @sbstr@ as th... John Abbott

13:06 CoCoA-5 Feature #1516 (In Progress): substring function

Start pos and length seem reasonable to me.
Should we also allow the version which goes to end of string? KISS: m... John Abbott

13:03 CoCoALib Design #1391 (Closed): RingElems: syntax with [ and ] ?

I have added some tests (to @test-RingElem5.C@).
All seems OK. Closing. John Abbott

11:58 CoCoALib Bug #1484: ker bug (quotientinghom for R/ideal())

Anna! check ring for empty lists! Anna Maria Bigatti

11:56 CoCoA-5 Bug #1539: Website: installation instructions for Microsoft

add the instruction written by Henry O'Keeffe Anna Maria Bigatti

11:53 CoCoA-5 Bug #1512 (Closed): Package with unexpected EOF

John Abbott

11:51 CoCoA-5 Design #1495 (Closed): Package exporting nothing?

Tested. OK. Anna Maria Bigatti

11:35 CoCoA-5 Feature #1509 (Closed): RingElems with empty input

Anna Maria Bigatti

11:31 CoCoA-5 Design #1546: Improve 'describe' or 'print' for a function

And also fix the manual. Anna Maria Bigatti

11:30 CoCoA-5 Design #1550 (Closed): version number for CoCoA5 snapshot release?

For snapshot releases: (Anna) remember to change the links in the webpage. Anna Maria Bigatti

11:28 CoCoA-5 Feature #1543 (Closed): Default path for packages

Anna Maria Bigatti

11:24 CoCoA-5 Design #1530 (Closed): VersionInfo -- better field names?

John Abbott

11:23 CoCoA-5 Support #1498 (Closed): Export many names or just one?

John Abbott

11:20 CoCoA-5 Slug #1556: DivAlg slower than NR

I checked: not as easy as I thought.
@NR@ is defined in @SparsePolyOps-RingElem.C@ and make use of ReductionCog. Th... Anna Maria Bigatti

11:19 CoCoA-5 Bug #1527 (Closed): Inadequate error message on incorrect list access

John Abbott

07 Jan 2021

20:54 CoCoALib Bug #1376: GBasisTimeout: not working as expected

The relevant source is probably in *@SparsePolyOps-reduce.C@* around line 133.
The timer object is constructed in... John Abbott

20:42 CoCoALib Bug #1376: GBasisTimeout: not working as expected

Setting the timeout to 20s worked very well. Setting it to 25s triggered an interruption after 95s.
Setting it to 9... John Abbott

20:19 CoCoALib Bug #1376: GBasisTimeout: not working as expected

Why are there no test cases for this issue? Without them how can i know if it has been satisfactorily solved?
Usi... John Abbott

20:26 CoCoALib Support #1555 (In Progress): Software licence

Here is a suggestion:
* find out how many different copyright messages we need (headers, source, tests, examples, do... John Abbott

20:04 CoCoALib Design #855: Copyright and authorship?

I have added Bigatti to all files which had just Abbott as copyright holder.
Anna should now add Abbott to all files... John Abbott

20:02 CoCoALib Slug #1557 (Resolved): Reading list of rationals is too slow

There was a bug in my first version of the faster code: @in.get(ch)@ does not put EOF into @ch@ when EOF is reached -... John Abbott

06 Jan 2021

11:40 CoCoALib Slug #1557: Reading list of rationals is too slow

I have found a potentially useful entry on *StackOverflow*: link @https://stackoverflow.com/questions/9272276/can-you... John Abbott

11:32 CoCoALib Slug #1557 (In Progress): Reading list of rationals is too slow

I'm still puzzled: @ScanUnsignedIntegerLiteral@ continue to be slower than whatever the CoCoA-5 interpreter does; cou... John Abbott

05 Jan 2021

21:55 CoCoALib Slug #1557: Reading list of rationals is too slow

The profiler indicates that major costs are @hgcd@ (from GMP) and @ScanUnsignedIntegerLiteral@ (from CoCoALib).
JA... John Abbott

21:43 CoCoALib Slug #1557 (Closed): Reading list of rationals is too slow

Winfried Bruns sent me a file with about 100000 rationals (total size about 130Mbytes).
If I read the file in using ... John Abbott

28 Dec 2020

17:56 CoCoALib Support #1555: Software licence

Here are what we need to do:
* ensure that all copyright lines are correct (Anna and me)
* remove the GPL blurb fro... John Abbott

23 Dec 2020

11:37 CoCoA-5 Design #1540: Double power

Relevant source is probably in @Parser.C@ around line 1890; *@Parser::parsePowerExpression@*
John Abbott

22 Dec 2020

17:19 CoCoA-5 Slug #1556: DivAlg slower than NR

Check the code for NR and see how to make the data type for the output. Anna Maria Bigatti

14:21 CoCoA-5 Slug #1556: DivAlg slower than NR

Just for the record: @NR@ took about 0.063s, @DivAlg@ took about 1280s.
Presumably @DivAlg@ should also be built-i... John Abbott

14:03 CoCoA-5 Slug #1556: DivAlg slower than NR

I verify that the problem is present in the current version on my computer.
*@NR@* is a built-in function; *@DivAl... John Abbott

13:57 CoCoA-5 Slug #1556 (New): DivAlg slower than NR

Andraschko reported the following by email:
Consider the following code which computes the minimal polynomial of sqr... John Abbott

16:20 CoCoA-5 Bug #1553 (Feedback): Timing SystemCommand

I have checked in *@ElapsedTime@* (incl. doc).
New qn: is the fn *@RealTime@* in CoCoALib obsolete? -- *NOTE:* may... John Abbott

16:16 CoCoALib Bug #1376: GBasisTimeout: not working as expected

What is the status of this issue? John Abbott

16:10 CoCoALib Bug #1542: gfan does not "deinitialize"

A non-solution is to modify the documentation to say that @GMPAllocator@ does not work well with GFan (or else the u... John Abbott

15:36 CoCoA-5 Design #1554: cocoa5-emacs-dir or cocoa5-root-dir?

The question arose after an email from Alasdair McAndrew (around 2020-12-18). Anna will investigate.
John Abbott

15:32 CoCoA-5 Design #1554 (In Progress): cocoa5-emacs-dir or cocoa5-root-dir?

Anna points out that there are complications on Microsoft where one cannot be entirely sure where the release is unpa... John Abbott

15:03 CoCoA-5 Design #1546: Improve 'describe' or 'print' for a function

Now "print/println ... (on ...)" prints the body of used defined functions.
To do: "describe" should give the name o... Anna Maria Bigatti