#9714: Graph(..., format='incidence_matrix') doesn't work with graphs that have
loops, but G.incidence_matrix() does.  So?
----------------------------+-----------------------------------------------
   Reporter:  was           |          Owner:  jason, ncohen, rlm
       Type:  defect        |         Status:  needs_review      
   Priority:  minor         |      Milestone:  sage-5.0          
  Component:  graph theory  |       Keywords:                    
Work_issues:                |       Upstream:  N/A               
   Reviewer:                |         Author:                    
     Merged:                |   Dependencies:                    
----------------------------+-----------------------------------------------
Changes (by brunellus):

  * status:  new => needs_review


Comment:

 Then there is another problem: checking forgets possibility that there are
 only two vertices defined. I tried to fix that: see the second doctest.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9714#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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