#13019: longest_path broken for digraphs
---------------------------------+------------------------------------------
Reporter: mhansen | Owner: jason, ncohen, rlm
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-5.1
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Mike Hansen
Authors: Nathann Cohen | Merged in:
Dependencies: | Stopgaps:
---------------------------------+------------------------------------------
Changes (by {'newvalue': u'Nathann Cohen', 'oldvalue': ''}):
* reviewer: => Mike Hansen
* author: => Nathann Cohen
Old description:
> {{{
>
> sage: g = graphs.CompleteGraph(5).to_directed()
> sage: g.longest_path(s=1,t=2)
> ---------------------------------------------------------------------------
> AttributeError Traceback (most recent call
> last)
> /home/mike/src/Imaging-1.1.7/<ipython-input-88-bddf7e1e9edc> in
> <module>()
> ----> 1 g.longest_path(s=Integer(1),t=Integer(2))
>
> /opt/sage/local/lib/python2.6/site-packages/sage/graphs/generic_graph.pyc
> in longest_path(self, s, t, use_edge_labels, algorithm, solver, verbose)
> 4772 (s is not None and (
> 4773 (s not in self) or
> -> 4774 (self._directed and self.degree_out(s) == 0)
> or
> 4775 (not self._directed and self.degree(s) ==
> 0))) or
> 4776 (t is not None and (
>
> AttributeError: 'DiGraph' object has no attribute 'degree_out'
> }}}
New description:
{{{
sage: g = graphs.CompleteGraph(5).to_directed()
sage: g.longest_path(s=1,t=2)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/mike/src/Imaging-1.1.7/<ipython-input-88-bddf7e1e9edc> in <module>()
----> 1 g.longest_path(s=Integer(1),t=Integer(2))
/opt/sage/local/lib/python2.6/site-packages/sage/graphs/generic_graph.pyc
in longest_path(self, s, t, use_edge_labels, algorithm, solver, verbose)
4772 (s is not None and (
4773 (s not in self) or
-> 4774 (self._directed and self.degree_out(s) == 0)
or
4775 (not self._directed and self.degree(s) == 0)))
or
4776 (t is not None and (
AttributeError: 'DiGraph' object has no attribute 'degree_out'
}}}
Apply trac_13019.patch
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13019#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
