Activity
From 22 Mar 2012 to 20 Apr 2012
20 Apr 2012
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12:19 CoCoALib Feature #125: Matrix equation solving; linear system solving
- While speaking to Renzo about choosing the name, I realised that solving a linear system is slightly different from s...
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- I really don't like the name @CardExp@ -- I think it is too cryptic.
The value it returns is log(cardinality)/log(... -
- After starting work on the reimplementation of @DUPFF@ in C++, I discovered that the interface to @SmallFpImpl@ is ne...
19 Apr 2012
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- Here are some ideas for convenient ring ctors which make homs too:
* change PPOrdering (makes new poly ring, and pro... -
- The following input:...
18 Apr 2012
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- First impls have been made.
The cardinality is represented by a fn called @CardExp@ which gives the exponent of @p... -
- I sometimes have a similar problem with Firefox: if I double click on a @*.html@ file and Firefox was not already run...
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- After trying some possibilities, my preference is now for the reason to appear in brackets, like this:...
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- I suggest the following format for the error message:...
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- I agree that names exported from packages should be protected (probably with the reason being that it was exported fr...
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- Corrected erroneous actual parameters in a call in @ColonExpression:implEval@ in file @Interpreter.C@.
I simply co... -
- We cannot use the Iverson bracket syntax directly because it already has a meaning: @[N>0]@ will produce a list conta...
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- Re Automatic conversion:
* Advantages: no need to choose a name, compactness
* Disadvantages: possible ambiguity, uns... -
- JAA suggests that @BringIn@ should be simple rather than "clever". For instance it should give an error in the follo...
17 Apr 2012
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- Increased priority to "high".
Waiting for Anna's return to discuss the correctness/usefulness of allowing CoCoA-5 ... -
- Currently @BringIn@ does not allow one to move from char 0 to char non-zero....
16 Apr 2012
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- Alessio would like a conversion from {false,true} to {0,1}.
Wikipedia mentions a function called "Iverson bracket" w... -
- Alessio did numerous timing experiments to understand whether reordering the variables could lead to a useful gain in...
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- As mentioned in the previous post, currently I have used several fn names for solving linear systems: a generic fn, a...
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- What names should we use for the fns which find a solution to a linear system? The name may be related to the name f...
15 Apr 2012
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- Now that there is a linear system solver I tried to write a general implementation for
@SparsePolyRingBase::IdealImp... -
- Implemented a first version where some GCD computations are passed to the old CoCoA-4 code. It is a poor implementat...
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- Currently CoCoALib computes GCDs using GBasis/syzygy computations. This is often terribly slow -- there is faster co...
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- Fixed.
*BUT* there remains a more subtle problem: the way the GUI determines the state of the parser appears to be...
13 Apr 2012
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- Added some doc in @MatrixArith.txt@, and a new test @test-matrix3.C@.
No new example program yet.
New fns not yet a... -
- JAA has an impl of the generic case (over a field).
JAA has written a test for this first impl.
No example, and no ...
10 Apr 2012
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- To answer the question "why...?" in the last update: the fn @access@ returns 0 if the file exists, and -1 if it does ...
05 Apr 2012
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15:36 CoCoA-5 Feature #128 (Closed): wordlist.txt generation
- Autocompletion depends on the file wordlist.txt
Right now we are still using the cocoa-4 wordlist (because we cannot... -
- Convert the old factorizer C code "DUPFF" into C++.
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- Create a new datastructures directory to hold source code for impls of various datastructures (e.g. the various Distr...
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- Add code for solving linear systems. There are several subcases:
* generic case over a field
* full rank and not f... -
- The args being considered are "indices"; we should be consistent regarding all sorts of index (well, at least non-neg...
04 Apr 2012
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- The purpose of the original code is unclear -- indeed it looks implausible/wrong....
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- For "public" functions (not member functions) like...
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- Think about the implementation of IdealOfPoints in the case of generic coefficients (_e.g._ in *@QQ(a)@*)
Implement ... -
- This issue is *closed*; it is a *DUPLICATE* of #206
Port cocoa-4 C code about LinKer to cocoalib.
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- Port in cocoalib the cocoa-4 C code about BuchbergerMoeller.
An important step in it is the lifting from Fp --> QQ...
03 Apr 2012
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- My "noddy" program for computing GBases can do the whole computation in a few seconds...
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- Here is another suspect starting ideal in @QQ[x,y,z],Lex@
@[x^4 +x*y^2*z +y^4, x^3*y +x^2*z^2 +z^2]@
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- The following should compute a LT ideal of a small ideal (using lex).
It takes longer than I would expect over QQ --... -
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- Sundry other changes to accomodate MSVC bugs.
Added some @#if@ conditionals as workarounds; ideally these should e... -
- Added include directives for @iterator@ in the cases where it was needed.
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- Exercising the option not to define static data members if their addrs are not needed, I have removed all such defns,...
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- All references to @unistd.h@ have been removed. The code now compiles on Windows (as well as Linux & MacOSX). This ...
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- The problem was that @BOOST_SCOPE_EXIT@ requires at least 1 arg, though this is not entirely evident from their docum...
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- The file @CoCoA4io@ should not be inside CoCoALib -- it belongs in CoCoAServer.
Move it... will lead to some consequ... -
- Discovering that BOOST seems to offer a ready-made solution, and that @access@ is old-style C-library.
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- Replace call to @access@ in Main.C (about line 192) by calls to BOOST filesystem fns such as @exists@ and @is_regular...
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- As far as I can tell BOOST does not offer such a simple fn.
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- To enable compilation on MSVC, I had to add defn of @isblank@.
Currently there are 3 separate (but identical) defns ...
02 Apr 2012
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30 Mar 2012
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- it is useful to allow rational coefficients (why not?) and appropriate conversion into ZZ when necessary (optimized O...
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- We have not yet decided about internal impl names.
JAA still likes his suggestion made two posts ago.
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- We don't have time to complete this change before 0.9950.
However we have decided that it is simplest for the user... -
- Alessandra reports:
# the examples are mostly OK; she reported some minor problems which J+A attended to immediately...
28 Mar 2012
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- The error was in Interpreter.C: I got the wrong "symmetry" with LessOrEqual....
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27 Mar 2012
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- John Abbott wrote:
> I do not like the "abandoned" square bracket at the end of the first line.
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> Generally I pref... -
- I do not like the "abandoned" square bracket at the end of the first line.
After speaking yesterday, we also conclud...
26 Mar 2012
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- Currently operations special to ideals in polynomial rings are located in @SparsePolyRing.H@ -- this seems incorrect....
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- after using the "old style" for a while I'm getting more and more convinced that a matrix should also print its own r...
23 Mar 2012
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- Currently CoCoALib does not distinguish between proper homs and partial homs.
Thus we can create a (partial) RingH... -
- Probably the simplest definition is simply that R1 is "simpler" than R2 if the construction of R2 passed explicitly v...
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- Alessandra reports:
* doc for almost all rings (except @ring@, @RingElem@) needs to be better organized
* reference... -
- Is it possible to create a readable collection of all function signatures and (more difficult) to link to the correct...
22 Mar 2012
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- I wonder why the only reports I can find on the internet about problems with @BOOST_SCOPE_EXIT@ and Visual C++ are ou...
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- John Abbott wrote:
> At the moment it is not clear to JAA what the CoCoALib interface should be if we adopt the RING...
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