#19418: skew-Hadamard matrices and related srg's
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Reporter: | Owner:
dimpase | Status: needs_work
Type: | Milestone: sage-6.10
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Nathann Cohen
combinatorics | Work issues:
Keywords: | Commit:
Authors: | c5a7eee39d4c6dce006d1f6f8fd7a23383d540b7
Report Upstream: N/A | Stopgaps:
Branch: |
public/19418 |
Dependencies: |
#19309 |
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Comment (by ncohen):
Helloooooooooooooooooooo,
> (back to Oxford with huge jetlag)
Wow. Common timezone again. Cool `;-)`
> `normalize_hadamard` does not do what I need; I need a different type of
normalization, in fact, where the matrix has the 1st row consisting of 1s,
and still H+H.T==2*I,
> i.e. the 1st column of H is all -1 (with exception of the top left
entry)
>
> Should I perhaps introduce `skew_normalize_hadamard`,
> that can only be applied to skew Hadamard matrices?
> (I'd have uses for it in graph constructions, too)
Sounds right. Then you can have a proper documentation and stuff. If you
plan to use it elsewhere that's even better.
> I'd rather add documentation, thanks for reminding.
> I find `skew_hadamard_matrix` already hard to read, and
> it would positively turn ugly if I start adding that explicit data for
matrices there.
Okayokay.
> How about we have a `PseudoLatinSquaresGraph(m,n)` or
`PseudoOrthogonalArrayBlockGraph(m,n)` ? (I'd prefer the former name; or
maybe we can have both?)
+1 to the former. With a description of what it is in its doc, if possible
`^^;`
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/19418#comment:17>
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