#15286: Latin squares
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.1
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
combinatorics | Work issues:
Keywords: | Commit:
Authors: | e02d42c390b8f3841cea5548abb1588efb6d99a3
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/15286 |
Dependencies: |
#15285 |
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Comment (by ncohen):
Hellooooooooo !!
> As far as I understand, when you raise the ValueError at line 162, it
means that the code does not exist. Not that the entries are not
consistent, right ? (I guess this is the purpose of your Warning in the
documentation). I would then prefer a NotImplementedError.
Well, it means that we have no idea whether it exists or not, and in
particular that Sage cannot built it. I don't really think it matters, but
I can change it if you want.
For instance, this paper was published not very long ago :
http://onlinelibrary.wiley.com/doi/10.1002/jcd.21384/abstract;jsessionid=6D04BFDDEA53369FE1ACDF6839FB7BD5.f01t01
So you can see what these MOLS mean : some guys are actually fighting to
know the maximum order of MOLS of a given size.
> Could you give the definition of your product (in the doc) ? Note that
there is also a different product in sage.combinat.matrices.latin_square
called `direct_product` and needs four latin squares as entries.
`O_o`
Well, the product I use is also called a direct product in Stinson's book.
Only his actually takes two latin squares of sizes `n,m` and returns a
latin square of size `nxm`, which makes infinitely more sense than taking
`4` squares as input with disjoints sets of symbols and concatenating them
in a larger matrix. Sigh.. Combinat code..
Anyway. Done, too.
> Because of your rebase on 6.1.beta2 I need some time to compile ;-(
Yeah, that's one of the problems with git.. If you just checkout an old
patch, you recompile everything. Well, at least now your Sage is up to
date `^^;`
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/15286#comment:8>
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