#19136: NO and NU graphs
-------------------------+-------------------------------------------------
Reporter: | Owner:
dimpase | Status: positive_review
Type: | Milestone: sage-6.9
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers: Nathann Cohen
theory | Work issues:
Keywords: | Commit:
Authors: Dima | dbc50b1b074afe22f4fb32542e8b1ca76c41525e
Pasechnik | Stopgaps:
Report Upstream: N/A |
Branch: |
u/dimpase/NONU |
Dependencies: |
#19098, #19180 |
-------------------------+-------------------------------------------------
Comment (by dimpase):
Replying to [comment:34 ncohen]:
> Okay, let's get this merged. You and I seldom agree on anything when it
comes to design, and the code works well anyway. I have been building all
graphs for which we detect a constructions up to 1000+, and there is no
problem there: we get the SRG we ask for, each time. And there is no
N<whatever> in the list of graphs we miss.
>
we can refactor the code so that eigenvalues are computed very early and
get
passed around as parameters to the `is_BLAH()` functions that use them.
Perhaps I'll do this some time later, if you don't mind.
OK, so we still have big classes to cover:
* GQs (of order (q-1,q+1) and (q+1,q-1), the others are there already).
* skew-Hadamard and relatives (I promised to work on this already...)
* Goethals-Seidel (8.C in [BvL84]; seems to be easy to do)
* Mathon: symmetric conference matrices (8.B in [BvL84])
I easily can do GQs, too, unless you already are on them...
--
Ticket URL: <http://trac.sagemath.org/ticket/19136#comment:35>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
