#19019: Very careless typoes in strongly_regular_db
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Reporter: ncohen | Owner:
Type: defect | Status: closed
Priority: major | Milestone: sage-6.9
Component: graph theory | Resolution: fixed
Keywords: | Merged in:
Authors: Nathann Cohen | Reviewers: Dima
Report Upstream: N/A | Pasechnik
Branch: | Work issues:
cb0b3fbd221fb01c0e392d141ba50427b0a0294f | Commit:
Dependencies: #19018 | Stopgaps:
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Comment (by dimpase):
Replying to [comment:24 ncohen]:
>
> > * the definition of RSHCD here does not match one in [BH12], where
the diagonal entries are all 1, and (n,e)-RSHCD has row sums e\sqrt{n}.
>
> So what do we do? With two papers that say contradictory things?
I was comparing your definition with the one from
http://homepages.cwi.nl/~aeb/math/ipm/ipm.pdf
and your definition is more complicated.
I did not check the other one.
> > And another thing - RSHCD should be mentioned in the module
description in the beginning of the corr. file.
>
> I don't understand.
If look at combinat/matrices/hadamard_matrix.py there is a paragraph
saying
{{{
The module below implements the Paley constructions (see for example
[Hora]_) and the Sylvester construction. It also allows you to pull a
Hadamard matrix from the database at [HadaSloa]_.
}}}
But there is no word about RSHCDs.
Should it instead get a list of methods, etc, as more modern Sage modules
have?
As well, you're not in the list of authors.
As I am gearing up for skew-Hadamard matrices, it can be done on the
corresponding ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/19019#comment:27>
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