#16272: redesign transversal designs
-------------------------------------+-------------------------------------
Reporter: vdelecroix | Owner: Vincent Delecroix
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: combinatorics | Resolution:
Keywords: designs, | Merged in:
orthogona arrays | Reviewers:
Authors: Vincent Delecroix | Work issues:
Report Upstream: N/A | Commit:
Branch: public/16272 | d81f265637099f93495dafac54e2d354be0d66d5
Dependencies: #15310, #16227, | Stopgaps:
#16281 |
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Comment (by ncohen):
> I do not care too much about calling twice the function.
Cool. Then I changed the code to have a nice "if/elif" structure. In some
very specific cases the projective plane function is called three times,
but
1) This is only when the answer has been found, so it does not happens
often per call
2) A tricky replacement is possible too, as
{{{
elif (t == 2 and
(projective_plane(n, existence=True) or
(k == n+1 and projective_plane(n, existence=True) is False))):
}}}
is equivalent to:
{{{
elif (t == 2 and
(projective_plane(n, existence=True) in (True,k<n+1))):
}}}
This being said the code of these things compared to the cost of building
the actual array ...
> We leave the idea of having an optional `k=None`? Might be an
independent ticket anyway.
Yep, let's close this one and get #16277 in. I will merge it in a second.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/16272#comment:52>
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