#11693: Edges are doubled when creating Graphs with multiedges=True
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Reporter: iandrus | Owner: iandrus
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.7.2
Component: graph theory | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Ivan Andrus
Merged: | Dependencies:
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Changes (by ncohen):
* status: needs_review => needs_info
Comment:
What about just testing "v == u" immediately before "data[v].append(u)" ?
The problem with multiedges is that the problem is not well defined. What
should be done when the input is :
* (1, 2), (2, 1)
* (1, 2), (1, 2)
* (1, 2, None), (1, 2, None)
* (1, 2, 'a'), (2, 1, 'a')
* (1, 2, 'a'), (2, 1, 'b')
And the same with dictionaries...
* { 1 : [2], 2 : [1] }
* { 1 : [2,2]}
* ...
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11693#comment:3>
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