#19712: strongly_regular_graph() crashes when mu=0
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Reporter: ncohen | Owner:
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-6.11
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: Nathann Cohen, | Reviewers:
Dima Pasechnik | Work issues:
Report Upstream: N/A | Commit:
Branch: public/19712 | 5bb551e4585722cb1be2fcb20c172b6f81262bae
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Nathann Cohen, Dima Pasechnik', 'oldvalue':
u'Nathann Cohen'}):
* priority: major => critical
* author: Nathann Cohen => Nathann Cohen, Dima Pasechnik
Old description:
> Reported by Georgi Guninski:
>
> {{{
> sage: graphs.strongly_regular_graph(10,2,1)
> <crash>
> }}}
>
> This is because of a "<whatever>%0" somewhere in the code. Which should
> not happen, as in a strongly regular graph we have mu>0.
>
> Nathann
New description:
Reported by Georgi Guninski:
{{{
sage: graphs.strongly_regular_graph(10,2,1)
<crash>
}}}
(and more of these).
This is because of a "<whatever>%0" and "<whatever>/0" in the code in
several places. Which happened, as it was confusion over the corner cases
mu=0 and mu=k.
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Ticket URL: <http://trac.sagemath.org/ticket/19712#comment:21>
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