#16846: a difference_matrices module
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Reporter: ncohen | Owner:
Type: enhancement | Status: new
Priority: major | Milestone:
Component: combinatorial designs | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies: #16817
Stopgaps: |
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This commit creates a `difference_matrices` module which does not do much
at the moment: it can creates DM for prime powers, and return DM from the
database.
In the database, however, a lot changes as many OA were actually
difference matrices. The constructors are turned into difference matrices
constructors, and `orthogonal_array` now calls `difference_matrix` to get
them.
All in all what this patch does is mostly code administration, but well,
that's the way to go ...
Quasi-difference matrices will be handled later as there are some problems
with them, in particular in the way `orthogonal_array` will query the
future `quasi_difference_matrix` constructor.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16846>
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