#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 | a5a4bbff80f2aed2a5b549d6b64f215967bc5ec7
Dependencies: | Stopgaps:
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Comment (by fredrik.johansson):
That part of the tests amounts to approximately 0.000% of the total
running time.
In any case, a constant factor anywhere in the code doesn't fundamentally
change the imbalance between testing and generating, as you suggested
above.
The reason testing is far slower is not a factor 2 inefficiency (or even a
factor 6 or whatever from not using BLAS) in the matrix multiplication,
but the fact that constructing a Hadamard matrix is only {{{O(n^2)}}}
while testing is {{{O(n^omega)}}}.
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Ticket URL: <http://trac.sagemath.org/ticket/19340#comment:21>
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