#19340: Better interface for hadamard_matrix
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Reporter: ncohen | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/19340 | 247a2bb4dcec180227cd9fb9bcd331a27a289016
Dependencies: | Stopgaps:
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Comment (by fredrik.johansson):
You might consider using the flint functions fmpz_mat_hadamard and
fmpz_mat_is_hadamard, which should be faster.
Checking by default seems kind of useless since this is much slower than
generating the matrix (generating a size 1000 Hadamard matrix takes 0.01
seconds and checking it takes 0.5 seconds), and unit testing should
provide reasonable certainty that the algorithm is correct. Flint's test
suite already checks for every size up to 300 that fmpz_mat_hadamard
either constructs a correct Hadamard matrix or reports that the size is
unsupported.
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Ticket URL: <http://trac.sagemath.org/ticket/19340#comment:6>
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