#11641: Implementation of decorator for combinatorial statistics and maps
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Reporter: stumpc5 | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-pending
Component: combinatorics | Resolution:
Keywords: combinatorial statistic | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Christian Stump | Merged in:
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Christian Stump', 'oldvalue': u'Chris Berg, Franco
Saliola, Christian Stump'}):
* status: new => needs_review
* work_issues: make it nice and smooth =>
* author: Chris Berg, Franco Saliola, Christian Stump => Christian Stump
* cc: cberg@…, saliola@… (removed)
* cc: chrisjamesberg, saliola (added)
Old description:
> An example:
>
> {{{
> sage: I = [
> (p,p.major_index()+2*p.number_of_inversions()-34*p.number_of_descents())
> for p in Permutations(3) ]
>
> sage: find_combinatorial_statistic(I)
> The tested combinatorial statistics on Standard permutations with values
> in Integer Ring where
> imajor_index
> longest_increasing_subsequence_length
> major_index
> number_of_descents
> number_of_fixed_points
> number_of_idescents
> number_of_inversions
> number_of_peaks
> number_of_saliances
>
> ((0, 0, 1, -34, 0, 0, 2, 0, 0), Free module of degree 9 and rank 3 over
> Integer Ring
> Echelon basis matrix:
> [ 3 0 0 0 2 -4 5 3 -6]
> [ 0 1 3 0 -1 -3 -1 -3 0]
> [ 0 0 0 1 0 -1 0 0 0])
> }}}
New description:
This patch implements decorators for combinatorial statistics and maps.
The aim is to be able to ask for all combinatorial statistics/maps for a
given combinatorial class.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11641#comment:3>
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