#16879: OA caching in C
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Reporter: ncohen | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.4
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: public/16879 | f13a4fd01da823289aedecf029277f515eac29f2
Dependencies: #16875 | Stopgaps:
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Comment (by ncohen):
Yo !
> The cache part is cool!
Yep.
> I am not confident of having everything switched into Cython.
I don't like it either. And it takes a lifetime to compile.
> It is much harder to debug and can also makes things slower.
Really ? Do you have an example ? `O_o`
> Why not only switch to C for the cache part?
Well, I can't cimport a cdef function in a .py file, but perhaps that does
not matter. I will move th caching code to designs_pyx.
> The function `orthogonal_array` might also move and we might also
recreate the `orthogonal_array_available` from #16875.
I am thinking about that. What is the difference between this
`orthogonal_array_available` and the current `orthogonal_array` ? I don't
talk about the user interface, just about speed. When the answer is cached
(most frequent case), what is it that `orthogonal_array_is_available` does
that `orthogonal_array` does not ? Only check that `k is not None` ?
> In the function `orthogonal_array`, I do not remember what was the point
of the variable `may_be_availale` in `orthogonal_arrays`... And I am
confused by the way it is used: if it is `False` then there is no need to
go further (but it concerns only the case when `existence=False`).
No need to go further to test constructions. But there may be non-
existence proofs implemented. That was the logic.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/16879#comment:4>
Sage <http://www.sagemath.org>
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