#21109: Faster meet() for lattice
-------------------------------------+-------------------------------------
Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-7.3
Component: combinatorics | Resolution:
Keywords: lattice poset | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/jmantysalo | Commit:
/faster-meet | b679b3ddc7f7e1552a098ee5b231d5e3eeff4249
Dependencies: | Stopgaps:
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Changes (by jmantysalo):
* status: needs_review => needs_work
Old description:
> This trivial patch will speed up computation of meet matrix in lattices.
> Before:
>
> {{{
> sage: P = Posets.BooleanLattice(10)
> sage: timeit("_ = P._hasse_diagram._meet", repeat=1, number=1)
> 1 loops, best of 1: 2.24 s per loop
> }}}
>
> After:
>
> {{{
> sage: P = Posets.BooleanLattice(10)
> sage: timeit("_ = P._hasse_diagram._meet", repeat=1, number=1)
> 1 loops, best of 1: 917 ms per loop
> }}}
New description:
This trivial patch will speed up computation of meet matrix in lattices.
Before:
{{{
sage: P = Posets.BooleanLattice(10)
sage: timeit("_ = P._hasse_diagram._meet", repeat=1, number=1)
1 loops, best of 1: 2.24 s per loop
}}}
After:
{{{
sage: P = Posets.BooleanLattice(10)
sage: timeit("_ = P._hasse_diagram._meet", repeat=1, number=1)
1 loops, best of 1: 917 ms per loop
}}}
And for small lattices:
{{{
sage: P10 = [P.with_bounds() for P in Posets(8)]
sage: timeit("len([P for P in P10 if P.is_meet_semilattice()])", repeat=1,
number=1)
}}}
Without this patch it took 5.46 seconds, after the patch 1.54 seconds.
--
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Ticket URL: <https://trac.sagemath.org/ticket/21109#comment:6>
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