#18733: MixedIntegerLinearProgram should support tableau-query methods 
getBInvARow,
getBInvRow, getBInvACol, getBInvCol
-------------------------------+------------------------
       Reporter:  mkoeppe      |        Owner:
           Type:  enhancement  |       Status:  new
       Priority:  major        |    Milestone:  sage-6.8
      Component:  numerical    |   Resolution:
       Keywords:  lp           |    Merged in:
        Authors:               |    Reviewers:
Report Upstream:  N/A          |  Work issues:
         Branch:               |       Commit:
   Dependencies:  #18732       |     Stopgaps:
-------------------------------+------------------------

Comment (by mkoeppe):

 The methods would raise `NotImplementedError` or other errors when no
 tableau is available. Even if the backend uses the simplex method, these
 methods may raise an error when `solve` has not been called yet.

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Ticket URL: <http://trac.sagemath.org/ticket/18733#comment:3>
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