#12164: graph subgraph_search does not return copy of subgraph
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Reporter: jason | Owner: jason, ncohen, rlm
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.8
Component: graph theory | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Jason Grout
Merged: | Dependencies:
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Description changed by jason:
Old description:
> Consider this example:
>
> {{{
> sage: k3=graphs.CompleteGraph(3)
> sage: p3=graphs.PathGraph(3)
> sage: s=k3.subgraph_search(p3)
> sage: s.size()
> 3
> sage: s==k3
> True
> }}}
>
> The docs say that s should be a copy of p3. The problem is that
> subgraph_search returns an *induced* subgraph of the bigger graph with
> the vertices of the copy of the smaller graph.
>
> Steve Butler suggests that instead, we copy the smaller graph and relabel
> the vertices appropriately, using the vertices returned from
> SubgraphSearch. I like that solution.
>
> '''apply''': [attachment:trac-12164-subgraph_search.patch]
New description:
Consider this example:
{{{
sage: k3=graphs.CompleteGraph(3)
sage: p3=graphs.PathGraph(3)
sage: s=k3.subgraph_search(p3)
sage: s.size()
3
sage: s==k3
True
}}}
The docs say that s should be a copy of p3. The problem is that
subgraph_search returns an *induced* subgraph of the bigger graph with the
vertices of the copy of the smaller graph.
'''apply''': [attachment:trac-12164-subgraph_search.patch]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12164#comment:5>
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