#17216: Poset / LatticePoset: [meet|join]matrix algorithm
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers: Nathann Cohen
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/poset___latticeposet___meet_join_matrix_algorithm|
a649be931b249028ff1e5961fc948c2daf50c695
Dependencies: | Stopgaps:
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Changes (by tscrim):
* status: positive_review => needs_info
Comment:
Has anyone checked that we do get speedups in meet/join matrix?
For the definition of a lattice, I've also been told you want a ''unique''
meet and join. Otherwise just the existence is something like regular
poset, sorry I forget the exact term right now.
Also could you make the very minor change:
{{{#!diff
- return matrix(ZZ, [[n-1-join[n-1-x][n-1-y] for y in range(n)] for
- x in range(n)])
+ return matrix(ZZ, [[n-1-join[n-1-x][n-1-y] for y in range(n)]
+ for x in range(n)])
}}}
IMO it makes the code easier to read, but feel free to disregard.
--
Ticket URL: <http://trac.sagemath.org/ticket/17216#comment:11>
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