John Abbott's activity
From 22 Oct 2020 to 20 Nov 2020
20 Nov 2020
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15:04 CoCoA-5 Design #1520: Replace BOOST_FOREACH by new C++14 range for syntax
- We still need to see where the new the @for@ syntax can be used in cocoalib -- that is issue #1346.
Maybe I should... -
- I think I have done most of the code in @src/CoCoA-5@.
It compiles and the CoCoA-5 tests all pass.
I made the chang... -
- I would like to maintain reasonable compatibility between the way CoCoA-5 parses expressions and the way @RingElem@ o...
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- Apparently the ability to suppress prompts could be useful for the ApCoCoA interface.
For that application, it wou... -
- What was nice was that Bernhard wrote "shouldn't cocoa-5.2 be cocoa-5.2?"
So even bug reporters can make typos ;-)
17 Nov 2020
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- The input functions are quite messy: not really a coherent design philosophy.
It seems that *@ReadExpr@* gives err... -
- Last week a student came with some problems with making CoCoA work on her MacBook; most of these are dealt with elsew...
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- A possible way to address the problem is to discourage users from typing *@/-@* by making it issue a warning.
As a... -
- This is probably not solvable :-(
I changed the emacs syntax declaration for "minus" into just a plain "." (punctu... -
- Here is some doc about emacs;...
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- Around line 335 in @cocoa5.el@ there is this...
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- As far as I can tell the following "digraphs" are recognized as starting a comment:
slash-star, slash-slash, slash-m... -
- I have tried a few tests. slash-minus seems to be recognised as a comment start; I have tried slash-char where char w...
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- If we do look at handling exponents, it might be nice to improve the error mesg when a negative exponent is given wit...
16 Nov 2020
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- I think CoCoA should give a warning or even an error. Currently, it gives neither!
On my computer I got *@x^8@*
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- What do you think CoCoA does with the following input?...
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- The installation instructions for Microsoft refer to the directory *@C:\cocoa-5.2\emacs@* instead of *@C:\cocoa-5.3\e...
13 Nov 2020
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- The C++ version does not work: @WhatsNext@ causes too much trouble :-(
Groan... -
- Remove the CoCoA-5 and make it call the cocoalib version.
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- *Anna will do the following*
(1) move the info about BOOST into the subrecord @ExternalLibs@ (_i.e._ added to the li... -
- Anna could you do the following on your old MacBook:
(1) download the official distrib
(2) follow the instructions ... -
- I have had trouble installing CoCoA-5 from our website on my old mac.
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- My personal opinion is that I do not like *@1/-2@* and *@2*-3@*; they both look like typos to me. Perhaps the user m...
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- Similar problem for *@RingElem(QQ, "2*-3");@*
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- What should the following do...
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- The matter was raised by Bernhard Andraschko. His argument is below:...
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- At the moment CoCoA-5 does not recognise the keyword @xel@ for specifying a term order when defining a new ring.
I...
12 Nov 2020
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- Here is a little background/motivation.
I demoed to the students how one can impl in CoCoA-5 the algm to compute a m...
11 Nov 2020
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- What should the names be?
In most contexts they are written @argmin@ (or maybe @arg min@ with a space).
Should be u... -
- Should this actually be in CoCoALib?
Might it be handy to have a version which returns the index (or indices) of t... -
- Here is a first prototype in CoCoA-5...
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- Proposal:
create new functions @argmin@ and @argmax@ which operate on lists.
The idea is that they return an/all ...
10 Nov 2020
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- Review the instructions for installing CoCoA-5.3 on MacOS.
Unfortunately it seems that an administrator account an... -
- It might be possible to extend the impl give above to handle quotients of poly rings, and perhaps also "towers" of po...
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- I suggest for the "Num bits" fields to the names *@NumBits_MachineInt@*, *@NumBits_MachineLong@* and *@NumBits_Small...
09 Nov 2020
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- It is not clear to me how to implement @+=@ etc. better than the naive way, and maintain exception safety.
It migh... -
- Revised example (now that we're mostly 64 bit)...
06 Nov 2020
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- Florian mentions that Singular has something called *@imap@*...
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- Here is a prototype in CoCoA-5... we would also need a version for cocoalib!!...
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- Here is the example Florian wanted:...
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- CoCoALib should offer some convenient pseudo-ctors for @RingHom@.
One example would be from @QQ[x,y,z]@ into @QQ(x... -
- The obvious convenient solution would be to allow @RingElem@ to accept the @RECORD@ produced by @IndetSymbols@.
Migh... -
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- The funcrions @RingElem@ and @IndetSymbols@ are sort-of-inverses; but we could perhaps do better?...
05 Nov 2020
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- At least + is commutative: @HilbertSeries(...)+1@ also causes a crash!
I have modified @Interpreter.C@, and checked ... -
- I have just tried using my last idea @rightOp->getType()->isProperSybstypeOf(..)@.
It compiled, and now produces a v... -
- The troublesome call is on line 1536 of @Interpreter.C@.
The problem is that @rightType@ has @dispatchIndex@ equal t... -
- The following input causes an assertion failure, followed by abort:...
04 Nov 2020
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- One mild concern is that the reading fns in C++ try to accept the maximum length initial string which gives "valid" i...
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- The code for reading a @BigRat@ can read it either as a fraction @N/D@ or as a decimal @Int.frac@.
For the "decima... -
- Ooops! I have had a look a what happens when a @BigInt@ is read... and I found a bug :-(
For @BigInt@ no space is... -
- Regarding point *(1)*... what should input of a @BigRat@ do with the following input streams?
* *@1/2@* -->JAA: ... -
- One possibility would be to require that an integer literal start with a decimal digit: _e.g._ there is no problem in...
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- I presume the timings in comment 4 were with @unsigned short@ as @SmallExponent_t@ (otherwise CoCoA has suddenly beco...
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- I would like @VersionInfo@ to tell me also how many bits are in @SmallExponent_t@ (since this does seem to affect exe...
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- The order of the fields printed by @VersionInfo@ is alphabetical. This means that some pieces of info are ordered st...
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- Is this issue still relevant?
Close? Reject? -
- Currently the script reports a very succinct error message if the executables cannot run (probably due to shared libr...
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- I have checked in the code.
03 Nov 2020
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- Can we make the link for the imminent (interim) release?
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- This is what happens now:...
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- I have made a change (by adding a call to mem fn @asRightValue@).
Now the code seems to be doing more or less what I... -
- Here is a little doc (where should it really go?)
The new script expects one of two possibilities for the @bin/@ d... -
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- I have checked in (despite the presence of some experimental changes).
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- I have implemented *@RingElemVec@*; the code is mostly shared with @RingElems@.
02 Nov 2020
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- I do not understand lines 146 and 147 in @AST.H@.
They seem to say that everything can be indexed by both INT and ST... -
- Na toll:...
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- There is a fn *@canBeIndexedByBigInt@*, but there does not seem to be a @canBeIndexedByString@*.
Maybe I should ma... -
- I have a partial fix: the error mesg now says "Expecting type STRING" if the value being indexed is a @RECORD@ otherw...
31 Oct 2020
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- I have some questions about what inputs should be accepted.
*(1)* when reading a @BigRat@ we accept <Integer-liter...
30 Oct 2020
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- I have changed the impl so that only a single name after @export@ is expected.
Amazingly it compiled first time, and... -
- Checked in, but not @symbol.C@.
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- The function @symbol::myInput@ reports an error by setting the channel state (@failbit@) rather than throwing an exce...
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- I have added checks to all input fns so that an exception is thrown if the istream is not in a good state when called...
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- After discussion with Anna, we have decided that it is more helpful if an exception is thrown if the @istream@ is not...
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- Checked in.
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- I have also implemented @RingElemVec@ (even though Anna did not want it).
I'll check in so we can test it.
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- Anna suggest using a virtual fn for printing which is specialized in PPMs which can have big exps.
JAA will think ... -
- Anna is uneasy about making a header file for just a single function.
Ideally, there could be some other similar fun... -
- Anna says it compiled cleanly now.
JAA: must remove the commented out code.
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- The relevant function seems to be *@IndexedAccessExpression::implEval@* in @Interpreter.C@ around lines 3677--3695.
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29 Oct 2020
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- I do not think it is dangerous.
We cannot easily compare with C++ input via the @>>@ operator since that reads int... -
- The current impl is acceptable for the time being; out efforts need to be directed elsewhere.
Closing.
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- The current version is acceptable; it could be made better, but there are plenty of other more important issues (at t...
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- I have fixed the bug: part of the code incorrectly assumed that the base was a prime number... ooops! (probably an o...
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- @FactorMultiplicity(3^39,factorial(21))@ goes into infinite loop :-/
It gets worse...
@FactorMultiplicity(9, fact... -
- Oh no! I have hit a bug:...
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- The current situation is acceptable. Further splitting might be a good idea at some point, but it is not so importan...
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- This has been in feedback for a month or so. CLosing:
Conclusion: fn name changed @KroneckerProd@, impl creates n... -
- Here is a guess as to why the observed times are as they are:
with @myBigExponents@ the ctor for @BigInt@ is called ... -
- What about *@utils-LongRange@*?
This name should also make it clear why the file is included.
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- The empirical complexity appears to be quadratic. Here is my test:...
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- Since we are no longer guaranteeing pre-C++11 compatibility, we can remove from Mario's code all @#if@ trickery relat...
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- Perhaps it could make sense to have a version of *@mul(mat,mat,mat)@* which is deliberately not exception safe (but a...
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- Ideally the installation process should also make available an easy way to uninstall the installed stuff.
We also ... -
- There are already fns *@IdealOfGBasis@* and *@SetGBasisAsGens@*. Where is the doc for the 2nd fn?
Despite some in... -
- The relevant source code is in @Parser.C@ from line 556 to 595.
It is surprisingly long; allowing just a single nam... -
- I propose the following new names:
* *@--allow-non-threadsafe@* for the @configure@ script
* *@CoCoA_ALLOW_NON_THRE...
28 Oct 2020
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- According to cppreference, the return value of @std::system@ is _implementation defined._
The CoCoA manual was too s...
27 Oct 2020
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- At the moment all fns which allow automatic promotion of ringelems call the function *@AutomaticConversionHom@*.
I... -
- I have changed the impl so that there is no auto promotion for matrices.
The example in comment 1 now gives... -
- I must change the impl so that only the ringelem gets mapped. To map the matrix one must make an explicit call.
O... -
- As suggested in comment 10 above, I have copied the "done list" and the "todo list" to issue #7.
Closing this issue ... -
- Here are done list and todo list copied from issue #1461 comments 7 & 8. Moving them here.
*DONE LIST*
* @Matri... -
- *I have decided to make this the "master issue" for questions related to automatic ring conversion* (mainly because i...
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- I have revised the manual entry for @matrix@. I did note that in the examples @mat@ is used rather than @matrix@ -- ...
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- *Conclusion: no automatic mapping of ringelems in equality tests*
A user working in several rings at once has to s... -
- *I am rejecting this because of the example in comment 3 above.*
I have also rejected the duplicate issue #636.
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- I am rejecting this. This issue is essentially duplicated in #1515.
*Main reason for rejection is in comment 3 of... -
- I have just tried again but with @SmallExponent_t@ being @unsigned short@ (previously it was @unsigned int@).
Printi... -
- I have just repeated the experiment, but in CoCoALib. This is the test program:...
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- This issue is a generalized version of issue #1500 (which itself is concerned with the example in comment 1 of this i...
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- I changed @SmartPtrIRC@ so that an @std::atomic<std::size_t>@ is used for the ref count instead of @std::size_t@.
I ...
26 Oct 2020
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- I have just tried modifying the impl (@PPMonoid.C@ around lines 215--230, @PPMonoidBase::myOutput@).
The modified ve... -
- Here is a reference test:...
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- I propose the following revision to the design:
* *(A)* each @PPMonoid@ has a fn which says whether it can handle on... -
- I now think it is probably a good idea to abandon the current design with explicit "NextLoaf" pointers (currently @s...
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- I think I have found the cause... it is in "invisible code" written by the compiler. The invisible code is correct, ...
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- Ahhh! Perhaps I should have guessed: @valgrind@ reports that the problem is *@stack overflow@*.
Now, why are we usi... -
- I got a SEGV with debugging on and MemPool disabled. Let's see what valgrind says...
BTW it was even slightly faste... -
- Triggered by the example from issue #1514.
The SEGV seems to arise during destruction at the end of the program!
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- See comment 4 below, where I understand the root cause.
Original report:
I get a SEGV reading about 4500 random l... -
- I now think that it is probably better to default to threadsafe code; the user must configure with "not threadsafe" t...
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- If we do follow this recommendation, which files must be considered?
* @RingElemInput@
* @BigInt@ and @BigRat@?
* ... -
- At the moment my preference is to recommend (strongly) that input fns immediately check whether the @istream@ is not ...
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- Output fns in CoCoALib check whether the @ostream@ is in a bad state, and if so, return without doing anything more.
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- I have improved (??) the code. It should give better err mesgs now. Here are some examples:...
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- *FINAL DECISION:*
* do not allow 0 multiplicity (will throw an exception)
* do not allow factorization objects over... -
- A temporary workaround for Julian is probably the following:
* obtain the CoCoA sources, modify @include/CoCoA/confi... -
- I was not able to get the information I wanted from @valgrind@ (probably my fault).
After some thinking (but less ... -
- See note 5 in issue #1514.
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- I tried Julian's example from issue #1514 using smaller types for @SmallExponent_t@, and found that it was significan...
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- The C++ substring function has the following interface:
* @substr(str,n)@ the substring starting at the n-th posn u... -
- I have done a little checking.
*The GMP header is automatically C++ safe:* it contains all necessary @extern "C"@ ... -
- Presumably the CoCoA-5 interpreter has a function which performs the command *@source@*. If this function can accept...
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- The template function for lists (of all sorts) is actually called @LIST::LIST@... mmm, is that a ctor?
It is defined... -
- Investigate whether the template fn @Value::from@ (see @Interpreter.H@ around lines 1422--1442) can avoid copying by ...
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- Low priority because the current code works (but I would like to reduce dependency on BOOST).
This is likely to be... -
- The CoCoA-5 interpreter uses @BOOST_FOREACH@ in several places; I think the C++14 "range" @for@ syntax is essentially...
23 Oct 2020
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- MemPool causes a SEGV! 8-O
I'll try without MemPool... if I can remember how.
*ANS:* configure with @--thread... -
- I have just made a first run with debugger/profiler --> SEGV
Ooops!
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- I have modified the test program so that it first generates a list of random linear forms (and then prints it).
Wi... -
- I have just recompiled CoCoALib to use @unsigned char@ as exponent type.
The program ran noticeably faster: about 3 ... -
- The test example as in the description took about 7 mins to generate the 20Mbyte file. That is disappointingly slow ...
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- According to the profiler: printing 250 polys each with about 500 terms (@RandomLinearForm@ from polyring with 1000 i...
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- It seems that printing polys in polyrings with many indets is slower than I would like: the example from issue #1514 ...
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- It could be that the problem is simply copying lots of PPs (each occupying 4000 bytes).
Could the memory manager be ... -
- The profiler tells me that @RandomLinearForm@ spends most (almost all!) of its time in @operator+=@.
If the indets... -
- I like Anna's suggestions:
* by default start with the initial ring @QQ[x,y,z]@ (why should it be assigned to a var... -
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- I wonder if we should be using @extern "C"@ when including the gmp header (but not the gmpxx header). -- *NO!!* (see ...
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- This ought to be very easy: I am sure that C++ already has such a function.
I came across the problem while lookin... -
- Proposal: a new function to extract a substring.
Syntax would be something like @substr(str, start, end)@ where ind... -
- Ah, me too. I have just checked in my code... oddly, there were no clashes. What does that mean?
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- *I am increasingly convinced that this is not a good idea.* The example in comment 3 is already fairly convincing.
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22 Oct 2020
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- This is almost a duplicate of issue #636.
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- The proposed change might be inconvenient in view of issue #637: the equality test @x = a@ would throw a @MixedRings...
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- A suggestion (but maybe not a good one).
Now that we have some degree of automatic ringelem conversion, we could say... -
- Clarification: the example in comment 1 does indeed run, but the resulting matrix is over @P@ not @K@.
To obtain a m... -
- I suggest closing this issue, and copying any unresolved parts into issue #7.
It would be nice to have issue #7 as t... -
- I now suggest that we make equality-test throw an error (@MixedRings@) if the args are elements of two different ring...
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- Idle for more than 6 years: perhaps because there is no clear answer, and implementation might be tricky :-/
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- I have just added to @SparsePolyRing.txt@ that the default term ordering is @StdDegRevLex@ (should we give an explic...
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