#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 ncohen):
> You might consider using the flint functions fmpz_mat_hadamard and
fmpz_mat_is_hadamard, which should be faster.
How easily can I call them on a Sage matrix?
> 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.
Sorry to disappoint, but I have thousands of line behind me (in
combinat/designs/) that implement old combinatorial designs from lost
papers. I know the value of this kind of testing.
> 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.
Are you saying that flint can be easily accessed from Sage *and* that it
contains a database of hadamard matrices? If so, I woulld be glad to call
it from the general constructor of hadamard matrices in Sage.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/19340#comment:7>
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