#10953: is_regular yields StopIterator error on empty graph
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Reporter: pgdx | Owner: jason, ncohen, rlm
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-5.0
Component: graph theory | Keywords: regular is_regular empty
graph iterator
Work_issues: | Upstream: N/A
Reviewer: Michael Orlitzky | Author: Lukáš Lánský
Merged: | Dependencies:
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Changes (by jdemeyer):
* status: needs_work => needs_review
* milestone: => sage-5.0
Old description:
> The following statement yields an error:
>
> sage: Graph().is_regular()
>
> A quick fix to this is to test if the size of the graph is zero, in which
> case we return true. I assume the empty graph is k-regular for any k. If
> this is not the case for sage, another (better) error should be thrown.
>
> Apply [attachment:trac_10953_empty_graph_is_regular.3.patch]
New description:
The following statement yields an error:
sage: Graph().is_regular()
A quick fix to this is to test if the size of the graph is zero, in which
case we return true. I assume the empty graph is k-regular for any k. If
this is not the case for sage, another (better) error should be thrown.
Apply [attachment:trac_10953_empty_graph_is_regular.4.patch]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10953#comment:11>
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