#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):
> > BTW, fmpz_mat_hadamard succeeds for every multiple of 4 below 92;
current code for the Paley construction in Sage doesn't succeed to
construct a size 20 Hadamard matrix.
Two updates:
1) With this branch, Sage can build a matrix for n=20. It's one of the
bugs I fixed
2) There is no Paley construction for 52 according on [1]. Either you get
the data somewhere else or there is something wrong in that code.
Nathann
[1] http://neilsloane.com/hadamard/
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Ticket URL: <http://trac.sagemath.org/ticket/19340#comment:10>
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