#6641: [with patch, needs work] switch the poset antichains method to use
GenericBacktracker and add antichains_iterator.
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Reporter: saliola | Owner: saliola
Type: enhancement | Status: new
Priority: major | Milestone: sage-combinat
Component: combinatorics | Keywords:
Reviewer: | Author: Franco Saliola
Merged: |
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Changes (by ddrake):
* type: task => enhancement
Comment:
I like using the backtracker code, and I'm the one who showed it to Franco
and said it was all great and stuff...but I think this is "needs work".
I've done a bunch of testing, and this patch is consistently 30-50% slower
than the current code. For some things, it was only about 15-20% slower,
but mostly it's 30-50%. Here's what I tested:
* antichain posets 5 and 10 elements
* symmetric group Bruhat order 3, 4
* chains with 10-14 elements
* random posets: 100 elements and 500 elements, with probabilities .05,
.2, and .5. The .sobj files for these are in my home directory on
sage.math.
A slowdown might be acceptable if there's a big win in code clarity,
memory use, ease of doctesting, etc, but I'm not sure we get any of that,
except maybe the memory usage. Thoughts?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6641#comment:2>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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