sage-combinat-devel Google Group

list your publications!

2013-05-15T20:10:36Z

Dear Sage-combinat developers and Users!

As you know, we obtained funding from the NSF for sage-combinat development.
In particular, the grant funded the new combinat server in Seattle, graduate
students, and various Sage Days.

The NSF is very picky this year about the annual reports and requested

Re: [sage-combinat-devel] problems with dot2tex

2013-05-15T19:42:55Z

By the way, it should be pyparsing 1.5?.x and not 2.x as that's only in
python 3.
Paul

Re: [sage-combinat-devel] problems with dot2tex

2013-05-15T16:32:06Z

Hi!

Oh, this is really terrible since we are constantly using the dot2tex option
to view pictures!

I created a ticket

[link]

Best,

Anne

Re: [sage-combinat-devel] problems with dot2tex

2013-05-15T00:49:56Z

Dear Sage-Combinat developers, dear Nathann,

Shoot, this is annoying:

sage: import dot2tex
...
ImportError: No module named pyparsing

dot2tex indeed needs pyparsing. And pyparsing used to ship with
matplotlib, but apparently the new version of matplotlib does not
include it anymore. So one need to install it somehow.

problems with dot2tex

2013-05-15T00:29:35Z

Hi!

Travis noticed that with sage-5.10.beta2, even if dot2tex is installed, sage
does not notice that it is installed. I seem to have the same problem

sage: B = CrystalOfTableaux(['A',2],shap e=[1])
sage: view(B)
dot2tex not available. Install after running 'sage -sh'

Any idea why?

Anne

Re: [sage-combinat-devel] Re: Algebra associated with a magma or monoid?

2013-05-14T14:53:35Z

Hi Simon,

Luckily, there is very little left to review; see my last comment on
the ticket.

I went through it yesterday and did a few small changes. For me it's
good to go. I left notes on the ticket for what remains to be double
checked (not much either).

Well, I haven't touched it in one year, so I still need to double

Re: [sage-combinat-devel] Re: Algebra associated with a magma or monoid?

2013-05-14T14:48:57Z

That's a good question. It's little code anyway, so if #12630 is ready
feel free to implement a temporary quiver algebra with a note stating
that the code will be removed soon.

Cheers,
Nicolas
--
Nicolas M. Thi�ry "Isil" <nthi...@users.sf.net>
[link]

Re: Algebra associated with a magma or monoid?

2013-05-14T14:35:52Z

By this statement, I mean: Does it make sense to make it depend on your
functorial construction patch, or would it be better to get quivers in
ASAP, even though some part of it will become redundant as soon as your
patch is merged?

Best regards,
Simon

Re: Algebra associated with a magma or monoid?

2013-05-14T14:28:04Z

Hi Nicolas,

Then I wonder what to do with #12630 (quiver representations and so on).

It does provide an implementation of quiver algebras, but I don't see why
one could not rely on a general construction (hence, on your functorial
construction patch). Of course, one does need new code for the quiver

Re: [sage-combinat-devel] Algebra associated with a magma or monoid?

2013-05-14T12:34:19Z

Hi Simon,

Yes, the dreaded functorial construction patch!

So at least you might get something back from reviewing its
prerequisites :-) After 12876 and 11935, I hope to post shortly 12895
(subcategory methods) and 13589 (c3 under control). And then off for
the big one.

Cheers,
Nicolas

Algebra associated with a magma or monoid?

2013-05-14T10:36:03Z

Hi!

If F is a (free associative) magma, for example given by a quiver, then
F.algebra(QQ) is supposed to return the QQ-algebra over F. However,
F.algebra(QQ) currently just returns a Combinatorial Free Module, and
multiplication of its elements is not available.

Are there patches on trac which would make F.algebra(QQ) return an

Re: [sage-combinat-devel] Set, sequence and multiset of combinatorial object

2013-05-11T13:08:23Z

Hi Jean-Baptiste,

That's precisely what species are about. I am not sure whether the
current implementation supports any enumerated set with grading as
leaf of the grammar though (the implementation in MuPAD-Combinat
did). It would not be hard to add though.

See sage.combinat.species.

Re: Set, sequence and multiset of combinatorial object

2013-05-11T07:10:03Z

ps: I know Florent has made a *SetFactory* but it is not what I ask.

(I think to something like *sage: Seq(Permutations())*.)

Le samedi 11 mai 2013 09:04:55 UTC+2, Jean-Baptiste Priez a écrit :

Set, sequence and multiset of combinatorial object

2013-05-11T07:04:55Z

Hello,
I would like to know if there exists a factory or something to build
automatically set, sequence or multi set of combinatorial classes.
If I am not clear, we have *rooted trees* then it seems natural to have
*forest of rooted trees* (may be there exists and I am interested)... so we
can create a new combinatorial class or we could use a factory to build

Re: [sage-combinat-devel] sage-queue does not apply to sage-5.10.beta2

2013-05-11T01:54:30Z

Yes, that's the one I am working on.

Nicolas
--
Nicolas M. Thiï¿½ry "Isil" <nthi...@users.sf.net>
[link]