#19973: More trouble with immutable graphs
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Reporter: jaanos | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.1
Component: PLEASE CHANGE | Resolution:
Keywords: graphs digraphs | Merged in:
immutable | Reviewers:
Authors: Janoš Vidali | Work issues:
Report Upstream: N/A | Commit:
Branch: | 7cf72ddf94e1ff2693fa158a5fb9be490e776cb3
u/jaanos/more_trouble_with_immutable_graphs| Stopgaps:
Dependencies: |
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Changes (by {'newvalue': u'Jano\u0161 Vidali', 'oldvalue': ''}):
* status: new => needs_review
* author: => Janoš Vidali
* cc: ncohen (added)
* keywords: => graphs digraphs immutable
* commit: => 7cf72ddf94e1ff2693fa158a5fb9be490e776cb3
* type: PLEASE CHANGE => defect
Old description:
New description:
Here is a fix to a few cases where things fail with immutable graphs due
to `subgraph` preserving the mutability of the graph. The affected methods
are `traveling_salesman_problem` (and then also `is_hamiltonian` and
`hamiltonian_cycle`) and `is_clique` with the parameter
`directed_clique=True`.
These problems have either been missed, or, more likely, introduced in
#19526.
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Ticket URL: <http://trac.sagemath.org/ticket/19973#comment:2>
Sage <http://www.sagemath.org>
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