#13240: Give posets polynomials (order, characteristic, zeta, etc.)
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Reporter: csar | Owner: sage-combinat
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.10
Component: combinatorics | Resolution:
Keywords: sd40, days45 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Alex Csar, Kevin Dilks | Merged in:
Dependencies: | Stopgaps:
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Old description:
> Adding some of the polynomials from Stembridge's Posets package for Maple
> (see http://www.math.lsa.umich.edu/~jrs/software/posetshelp.html),
> namely:
>
> * characteristic polynomial (done)
> * zeta polynomial (done)
> * flag f-polynomial (done)
> * flag h-polynomial (done)
> * f-polynomial (done)
> * h-polynomial (done)
> * order polynomial (done)
> * chain polynomial (done)
> * W-polynomial
> * antichain polynomial
>
> apply:
> * [attachment:trac_1324O_first_step-fc.patch]
> * [attachment:trac_12340_poset_polynomials-csar.patch]
New description:
Adding some of the polynomials from Stembridge's Posets package for Maple
(see http://www.math.lsa.umich.edu/~jrs/software/posetshelp.html), namely:
* characteristic polynomial (done)
* zeta polynomial (done)
* flag f-polynomial (done)
* flag h-polynomial (done)
* f-polynomial (done)
* h-polynomial (done)
* order polynomial (done)
* chain polynomial (done)
* W-polynomial
* antichain polynomial
apply:
* [attachment:trac_1324O_first_step-fc.patch]
* [attachment:trac_12340_poset_polynomials-csar.patch]
* [attachment:trac_13240-review1-fc.patch]
--
Comment (by chapoton):
ok, here is a short review patch of your code.
I have removed trailing whitespaces that you had introduced, and made
small changes to the code. I have also made sure that each method starts
with a brief (one-line) description of what it does. Details are then
given on other lines.
I would prefer not to propose the use of another variable in the code, but
rather give no option. The user will get a polynomial, that he can then
evaluate on whatever he wants. I think this keeps the code cleaner and
shorter.
Combining patches is indeed easy, and can be done just once when
everything is ready.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13240#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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