#19712: strongly_regular_graph() crashes when mu=0
-------------------------+-------------------------------------------------
Reporter: | Owner:
ncohen | Status: needs_work
Type: | Milestone: sage-6.11
defect | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers:
theory | Work issues:
Keywords: | Commit:
Authors: | ca5fdfb9419f06b84b1bc1c2c3e46f3e0ee446d8
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
public/19712 |
Dependencies: |
-------------------------+-------------------------------------------------
Changes (by dimpase):
* status: needs_review => needs_work
Comment:
here is a problem; not everything to do with strong regularity goes
through the function you just changed:
{{{
sage: g=graphs.CompleteBipartiteGraph(3,3)
sage: g.is_strongly_regular()
True
sage: g.is_strongly_regular(parameters=True)
(6, 3, 0, 3)
sage:
graphs.strongly_regular_graph(*g.is_strongly_regular(parameters=True))
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
...
ValueError: There exists no (6, 3, 0, 3)-strongly regular graph
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/19712#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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