CoCoA

25 Oct 2014

17:06 CoCoA-5 Design #637: Undesirable consequence of automatic mapping of RingElems?

Here is a short session valid with the current version of CoCoA-5... John Abbott

23 Oct 2014

22:23 CoCoA-5 Design #637 (In Progress): Undesirable consequence of automatic mapping of RingElems?

I think the values of @deg(A)@ and @deg(B)@ are well defined.
If we have @not(deg(A) = deg(B))@ then it would be q... John Abbott

22:12 CoCoA-5 Design #637 (Closed): Undesirable consequence of automatic mapping of RingElems?

Suppose we allow automatic mapping of ringelems into superrings.
Consider the following scenario:... John Abbott

22:05 CoCoA-5 Design #636: Distinguish indets from symbols in coeffring in Use command

Consider the following scenario:... John Abbott

18:42 CoCoA-5 Design #636 (Rejected): Distinguish indets from symbols in coeffring in Use command

The @use@ command assigns the top-level variables whose names match those of the symbols in the ring. The assigned v... John Abbott

18:37 CoCoA-5 Design #635: Automatic mapping of RingElem (in operation with a compound value)

At the moment the idea of automatically "mapping down" ring elements makes me feel uneasy (perhaps solely because I h... John Abbott

12:57 CoCoA-5 Design #635: Automatic mapping of RingElem (in operation with a compound value)

The description says it all, but I prefer phrase it also like this:... Anna Maria Bigatti

12:32 CoCoA-5 Design #635 (In Progress): Automatic mapping of RingElem (in operation with a compound value)

I note that this proposal would still produce an error if one tries to compute:... John Abbott

12:21 CoCoA-5 Support #548: Printing rings with ID

I think it has just been forgotten; it seems like a good idea to me. Indeed now that direct printing produces a very... John Abbott

11:08 CoCoA-5 Support #548: Printing rings with ID

I have implemented in CoCoALib ... Anna Maria Bigatti

22 Oct 2014

20:11 CoCoA-5 Design #635: Automatic mapping of RingElem (in operation with a compound value)

Robbiano's scenario was the following... a bit simplified:... John Abbott

20:07 CoCoA-5 Design #635 (Closed): Automatic mapping of RingElem (in operation with a compound value)

If we decide to allow automatic mapping of @RingElem@ values, Anna suggests that only simple/single values can be aut... John Abbott

20:02 CoCoA-5 Design #634 (Rejected): Symbol in the coeff ring

My previous comment convinces me that it is not feasible to make @a@ have the value of the symbol @a@ in the smallest... John Abbott

18:35 CoCoA-5 Design #634: Symbol in the coeff ring

There is a potential problem with my suggestion of symbols being mapped into the smallest containing subring. In the... John Abbott

16:11 CoCoA-5 Design #634: Symbol in the coeff ring

The problem was highlighted when Robbiano wanted to multiply a matrix (over @K@) by @a@; CoCoA-5 gave a _mixed rings_... John Abbott

16:08 CoCoA-5 Design #634 (Rejected): Symbol in the coeff ring

Consider the following mini-session... John Abbott

14:39 CoCoALib Bug #593: Temporary directories used during configuration

Christof reported problems with my one of my shell scripts which uses the @trap@ facility to guarantee proper cleanin... John Abbott

15 Oct 2014

12:13 CoCoALib Bug #631: Ambiguous: rank for matrix (in ex-matrix1.C)

John Abbott wrote:
> After speaking to Anna by phone, I have changed the name of @rank@ into @rk@.
>
> I'm ready ... Anna Maria Bigatti

12:06 CoCoALib Bug #631: Ambiguous: rank for matrix (in ex-matrix1.C)

John Abbott wrote:
> I now believe the ambiguity would disappear if the entire function were placed inside @namespac... Anna Maria Bigatti

14 Oct 2014

21:34 CoCoALib Design #619: Modulus (for CRTMill) ambiguous

(see #631 comment 5) I think the problem goes away if the code is put inside @namespace CoCoA@.
John Abbott

18:26 CoCoALib Design #619: Modulus (for CRTMill) ambiguous

Assuming my explanation in the _correction_ in comment 1 is correct, then the STL people could break our code at any ... John Abbott

18:22 CoCoALib Design #619: Modulus (for CRTMill) ambiguous

John Abbott wrote:
> I think the C++ rules will compel us to change name -- asking the user to write @CoCoA::modulus... Anna Maria Bigatti

18:18 CoCoALib Design #619 (In Progress): Modulus (for CRTMill) ambiguous

I think the C++ rules will compel us to change name -- asking the user to write @CoCoA::modulus@ every time is not ac... John Abbott

21:32 CoCoALib Bug #631: Ambiguous: rank for matrix (in ex-matrix1.C)

I now believe the ambiguity would disappear if the entire function were placed inside @namespace CoCoA@. We could mo... John Abbott

21:25 CoCoALib Bug #631: Ambiguous: rank for matrix (in ex-matrix1.C)

Strictly speaking the proper solution to the problem is to put a @using CoCoA::rank;@ inside the function which will ... John Abbott

20:03 CoCoALib Bug #631: Ambiguous: rank for matrix (in ex-matrix1.C)

After speaking to Anna by phone, I have changed the name of @rank@ into @rk@.
I'm ready to do CVS check in, but fi... John Abbott

18:26 CoCoALib Bug #631: Ambiguous: rank for matrix (in ex-matrix1.C)

John Abbott wrote:
> I think the problem arises because @rank(M)@ entails a user type conversion from @matrix@ to @C... Anna Maria Bigatti

18:23 CoCoALib Bug #631 (In Progress): Ambiguous: rank for matrix (in ex-matrix1.C)

I think the problem arises because @rank(M)@ entails a user type conversion from @matrix@ to @ConstMatrixView@.
@s... John Abbott

13:05 CoCoA-5 Feature #633 (New): New operations? ScalarProduct(MODULELEM,LIST), MATRIX * MODULELEM

I think that ScalarProduct(MODULELEM,LIST) is OK
but MATRIX * MODULELEM may be ambiguous (row or col?)
For sure we ... Anna Maria Bigatti

13 Oct 2014

23:00 CoCoALib Bug #593 (In Progress): Temporary directories used during configuration

I now think that a good solution would be to put tmpdirs in @configuration/TMP/@. That way they can all be "cleaned"... John Abbott

20:47 CoCoALib Feature #630: Add graeffe function?

If I recall correctly, Bini said that graeffe can also be done for polynomial systems. Right now I cannot see when i... John Abbott

03 Oct 2014

12:03 CoCoA-5 Support #632: MacOSX: many warnings with compiler CLANG/LLVM when compiling BOOST code.

I have revised some impls in @CoCoALibSupplement.C@ to avoid some warnings by Clang/LLVM; the problem derived from th... John Abbott

12:00 CoCoA-5 Support #632: MacOSX: many warnings with compiler CLANG/LLVM when compiling BOOST code.

Currently the edit has to be done by hand.
Is it worth trying to add the flag automatically? (_e.g._ during config... John Abbott

11:57 CoCoA-5 Support #632 (Closed): MacOSX: many warnings with compiler CLANG/LLVM when compiling BOOST code.

Recent MacOSX compilers produce lots of (spurious?) warnings when compiling BOOST code.
The warnings can be suppre... John Abbott

26 Sep 2014

15:40 CoCoALib Bug #631 (Closed): Ambiguous: rank for matrix (in ex-matrix1.C)

Apple LLVM version 6.0 (Laura's new computer) reports that @rank@ is ambiguous in @ex-matrix1.C@
John Abbott