#19161: LatticePoset: faster is_complemented()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/faster_is_complemented| bf8fdd5dd0702a6158691183ac6a3351461a650e
Dependencies: | Stopgaps:
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Description changed by jmantysalo:
Old description:
> As playing with matrices is much faster than looping over elements, this
> patch makes `is_complemented()` much faster.
>
> Let `L10` bet the list of all lattices of 10 elements and `B10` be the
> Boolean lattice with `2^10` elements. Then without the patch it takes
> 7,76 seconds to run `len([L for L in L10 if L.is_complemented()])` and
> 101,84 seconds to run `L.is_complemented()`. With the patch the time
> reduces to 0,38 and 0,23 seconds.
New description:
As playing with matrices is much faster than looping over elements, this
patch makes `is_complemented()` much faster.
Let `L10` bet the list of all lattices of 10 elements and `B10` be the
Boolean lattice with `2^10` elements. Then without the patch it takes 7,76
seconds to run `len([L for L in L10 if L.is_complemented()])` and 101,84
seconds to run `B10.is_complemented()`. With the patch the time reduces to
0,38 and 0,23 seconds.
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Ticket URL: <http://trac.sagemath.org/ticket/19161#comment:3>
Sage <http://www.sagemath.org>
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